This is a well-structured PR that successfully implements autosave functionality with smart change detection and improves the overall UX. The changes align well with the project's architecture patterns and conventions outlined in CLAUDE.md.

Strengths:

• Clean implementation of autosave with proper state management
• Good separation of concerns between privacy saves and response saves
• Thoughtful UX with visual feedback (SaveStatus component)
• Proper cleanup of the versioning system
• Comprehensive RLS implementation

Positive Aspects:

1. State Management: The autosave implementation in QuestionCard.svelte follows the context-based architecture pattern correctly
2. Component Design: New components (SaveStatus, UndoButton) are properly modular and reusable
3. Database Layer: Removal of versioning system simplifies the codebase significantly
4. Naming Conventions: All new code follows the established conventions (camelCase functions, PascalCase components)

Minor Suggestions:

1. Consider extracting the autosave logic into a custom hook/utility for reusability across other forms
2. The console.log statements in QuestionCard.svelte (lines 44, 51, 57, 74) should be removed before production

1. Race Condition in Privacy Toggle (QuestionCard.svelte:169-172):

   const toggleVisibility = () => {
       visibility = visibility === 'public' ? 'private' : 'public';
       savePrivacySetting(); // This is async but not awaited
   };

   The visibility state updates immediately while save is async, potentially causing UI/DB desync if save fails.

2. Missing Error Handling (QuestionCard.svelte:deleteResponse):

   • The error is logged but not shown to the user
   • Consider showing an error toast/modal if deletion fails

3. Keyboard Shortcut Platform Detection (QuestionCard.svelte:239):

   • The Mac detection could be more robust:

   const isMac = navigator.userAgent.toUpperCase().indexOf('MAC') >= 0;

   Consider using navigator.platform or a more comprehensive check

1. Database Queries:

   • The cascade deletion implementation is efficient with proper foreign key constraints
   • Good use of database-level cascading instead of application-level deletion loops

2. State Updates:

   • The autosave debouncing is implicit (only saves on OK button click), which prevents excessive DB writes
   • Consider adding explicit debouncing if users request true auto-save on typing

3. CSS Optimizations:

   • The new responsive layouts use efficient CSS Grid and Flexbox
   • Container queries in footer are a modern, performant approach

4. Potential Optimization:

   • In ActionsCRUD.svelte, actions are filtered client-side (line 58). With many actions, consider server-side filtering

✅ Strong Security Implementation:

1. Row Level Security (RLS):

   • Comprehensive RLS policies for all user tables
   • Proper separation between dev and production configurations
   • Service role access properly implemented for admin operations

2. Access Control:

   • Each table has appropriate CRUD policies scoped to authenticated users
   • The cascade deletion respects RLS policies

⚠️ Security Considerations:

1. Development RLS Migration (20250923205334_allow_anon_access_for_dev.sql):

   • CRITICAL: This migration allows anonymous access and must NEVER be applied to production
   • The RLS_CONFIG.md properly documents this, but consider adding a safety check in the migration script

2. Profile ID Validation:

   • Good validation in components checking for profileId before operations
   • Consider adding server-side validation as well for defense in depth

3. Input Validation:

   • Good client-side validation in ActionsCRUD.svelte
   • Consider adding server-side validation for response text length limits

❌ Critical Gap: No Test Coverage for New Features

The PR adds significant functionality but includes no tests:

1. Missing Component Tests:

   • SaveStatus.svelte - Visual feedback component
   • UndoButton.svelte - User interaction component
   • QuestionCard.svelte - Complex autosave logic
   • ActionsCRUD.svelte - CRUD operations

2. Missing Integration Tests:

   • Autosave flow with success/failure scenarios
   • Undo functionality with keyboard shortcuts
   • Cascade deletion behavior
   • RLS policy enforcement

3. Recommended Test Additions:

   // Example test for SaveStatus component
   describe('SaveStatus', () => {
     test('shows saving state with spinner', () => {
       render(SaveStatus, { status: 'saving' });
       expect(screen.getByText('Saving...')).toBeInTheDocument();
       expect(screen.getByRole('status')).toBeInTheDocument(); // spinner
     });
   });

High Priority:

1. Add comprehensive test coverage for all new components and features
2. Remove console.log statements from production code
3. Add error boundaries around the autosave components
4. Document the RLS migration strategy more prominently for production deployment

Medium Priority:

1. Consider adding telemetry for autosave success/failure rates
2. Implement retry logic for failed saves
3. Add loading skeletons instead of simple "Loading..." text
4. Consider WebSocket/real-time sync for multi-device scenarios

Low Priority:

1. Extract autosave logic into a reusable hook
2. Add haptic feedback on mobile for save actions
3. Consider optimistic UI updates with rollback on failure

• ✅ Code style and formatting: Follows established patterns
• ✅ Naming conventions: Consistent with CLAUDE.md guidelines
• ✅ Architecture patterns: Proper context-based state management
• ✅ Error handling: Basic implementation, could be enhanced
• ❌ Test coverage: No tests for new features
• ✅ Documentation: RLS_CONFIG.md is comprehensive
• ❓ Accessibility: Unable to fully assess without testing, but structure looks good

1. Well-designed autosave pattern: The implementation separates privacy setting saves (automatic) from content saves (manual with OK button), providing a good balance between automation and user control.

2. Excellent database migration strategy:

   • Proper removal of complex versioning system
   • Good implementation of RLS policies with development/production separation
   • Clean cascade deletion setup

3. Responsive design improvements: Good mobile-first approach with thoughtful breakpoints and container queries

4. User feedback mechanisms: Clear visual indicators (SaveStatus, UndoButton) help users understand system state

5. Security considerations: RLS implementation addresses previous security vulnerabilities appropriately

1. Race Condition in Response Creation

In QuestionCard.svelte, both savePrivacySetting() and saveResponse() call createResponse(), which could lead to duplicate responses:

// Line 153 & 213: Both functions call createResponse
await createResponse(profileId, responseData);

Recommendation: Implement an upsert pattern or check for existing response before creating:

// Check if response exists first
const existingResponse = await getResponseByQuestionId(profileId, questionId);
if (existingResponse.data) {
  await updateResponse(existingResponse.data.id, responseData);
} else {
  await createResponse(profileId, responseData);
}

2. Missing Error Boundaries

The autosave system lacks proper error recovery mechanisms. If a save fails, users have no way to retry except reloading the page.

Recommendation: Add retry logic and user-facing error recovery:

const saveWithRetry = async (retries = 3) => {
  try {
    await saveResponse();
  } catch (error) {
    if (retries > 0) {
      await new Promise(r => setTimeout(r, 1000));
      return saveWithRetry(retries - 1);
    }
    // Show persistent error with manual retry button
  }
};

3. Potential Data Loss on Navigation

No warning when users navigate away with unsaved changes (hasChanges === true).

Recommendation: Add navigation guard:

$effect(() => {
  if (hasChanges) {
    window.onbeforeunload = () => "You have unsaved changes";
  } else {
    window.onbeforeunload = null;
  }
});

1. Database Query Optimization

The cascade deletion in QuestionCard.svelte (lines 47-62) fetches all actions before deleting. This could be optimized:

Current: O(n) queries for n actions
Better: Let the database cascade handle it automatically (already set up in migration)

// Remove manual action deletion - let CASCADE handle it
const { error } = await supabase
  .from('responses')
  .delete()
  .eq('id', connectionDetails.responseId);

2. Debounce Missing on Input

The handleInput() function runs on every keystroke without debouncing, causing unnecessary state updates.

Recommendation:

import { debounce } from '$lib/utils';
const handleInput = debounce(() => {
  canUndo = true;
  checkForChanges();
}, 300);

3. Unnecessary Re-renders

Multiple $state variables could be combined to reduce reactivity overhead:

// Instead of:
let privacySaveStatus = $state('idle');
let privacySaveError = $state<string | null>(null);

// Consider:
let privacySave = $state({ status: 'idle', error: null });

1. RLS Policy Gaps

While RLS is implemented, the development policies are too permissive. The anon role has full access which could be exploited.

Recommendation: Use environment-based RLS policies:

CREATE POLICY "Allow access based on environment" ON profiles
FOR ALL USING (
  CASE 
    WHEN current_setting('app.environment', true) = 'development' THEN
      auth.role() IN ('anon', 'service_role', 'authenticated')
    ELSE
      auth.uid() = user_id
  END
);

2. Missing Input Sanitization

No XSS protection on user inputs (response_text, action descriptions).

Recommendation: Add sanitization before display and storage:

import DOMPurify from 'isomorphic-dompurify';
const sanitizedText = DOMPurify.sanitize(connectionDetails.responseInput);

Critical Missing Tests:

1. Autosave functionality: No tests for the core feature of this PR
2. Change detection logic: Untested edge cases in hasChanges computation
3. Undo/Redo behavior: Keyboard shortcuts and state management untested
4. Cascade deletion: Database constraint behavior untested
5. RLS policies: No tests verifying access control works correctly

Recommendation: Add comprehensive test suite:

describe('QuestionCard Autosave', () => {
  test('should detect changes when text is modified', async () => {
    const { getByRole } = render(QuestionCard);
    const textarea = getByRole('textbox');
    
    await userEvent.type(textarea, 'New text');
    expect(getByRole('button', { name: 'OK' })).not.toBeDisabled();
  });
  
  test('should handle undo with Ctrl+Z', async () => {
    // Test keyboard shortcut behavior
  });
});

1. Accessibility Improvements

• Add aria-live regions for save status announcements
• Ensure keyboard navigation works properly for all interactive elements
• Add proper ARIA labels for dynamic content changes

2. Code Organization

• Extract autosave logic into a reusable Svelte store or composable
• Consider moving database operations to server-side endpoints for better error handling

3. Documentation

• Add JSDoc comments for complex functions
• Document the autosave behavior in user-facing help content
• Update ARCHITECTURE.md with new autosave patterns

4. Migration Safety

• Add rollback migrations for production deployment
• Consider feature flags for gradual rollout

This is a well-executed PR that successfully implements autosave functionality with smart change detection. The implementation shows good separation of concerns between privacy settings (automatic save) and response content (manual save via OK button). The removal of the versioning system significantly simplifies the codebase while maintaining functionality.

Strengths:

• Clean implementation of the autosave pattern
• Excellent UX with visual feedback components (SaveStatus, UndoButton)
• Smart cascade deletion at the database level
• Comprehensive RLS implementation with proper development/production separation
• Mobile-responsive improvements are thoughtful

1. Race Condition in Privacy Toggle

In QuestionCard.svelte:153-156:

const toggleVisibility = () => {
    visibility = visibility === 'public' ? 'private' : 'public';
    savePrivacySetting(); // Async but not awaited
};

The UI updates immediately while save is async, potentially causing desync if save fails.

Recommendation: Update UI only after successful save:

const toggleVisibility = async () => {
    const newVisibility = visibility === 'public' ? 'private' : 'public';
    const result = await savePrivacySetting(newVisibility);
    if (result.success) {
        visibility = newVisibility;
    }
};

2. Potential Duplicate Response Creation

The upsertResponse function in responses.ts tries to update first, then create if update fails. However, this could create duplicates in high-concurrency scenarios or if the update fails for reasons other than "record not found".

Recommendation: Use Supabase's native upsert functionality:

const { data, error } = await supabase
    .from('responses')
    .upsert({
        ...responseData,
        user_id: userId,
        question_id: questionId
    }, {
        onConflict: 'user_id,question_id'
    });

3. Missing Navigation Guards

Users can lose unsaved changes if they navigate away when hasChanges === true.

Recommendation: Add beforeunload handler in QuestionCard.svelte:

$effect(() => {
    const handler = (e: BeforeUnloadEvent) => {
        if (hasChanges) {
            e.preventDefault();
            e.returnValue = '';
        }
    };
    window.addEventListener('beforeunload', handler);
    return () => window.removeEventListener('beforeunload', handler);
});

4. Console.log Statements

Multiple debug logs remain in production code:

• QuestionCard.svelte: lines 42, 55, 75-97
• responses.ts: lines 127-169, 183-221, 234-259

These should be removed or wrapped in a debug flag.

1. Unnecessary Re-renders

The handleInput function runs on every keystroke without debouncing, causing frequent state updates.

Recommendation: Add debouncing:

import { debounce } from '$lib/utils';

const handleInput = debounce(() => {
    canUndo = true;
    checkForChanges();
}, 300);

2. State Management Optimization

Multiple related $state variables could be combined:

// Instead of:
let privacySaveStatus = $state('idle');
let privacySaveError = $state<string | null>(null);

// Consider:
let privacySave = $state({
    status: 'idle' as 'idle' | 'saving' | 'saved' | 'error',
    error: null as string | null
});

3. Cascade Deletion Efficiency

The current implementation is correct - using database-level CASCADE is more efficient than application-level deletion loops. Good choice!

✅ Strong Security Implementation:

1. Row Level Security: Comprehensive RLS policies properly implemented
2. Access Control: Each table has appropriate CRUD policies
3. Development/Production Separation: Clear distinction between environments

⚠️ Critical Security Considerations:

1. Development RLS Migration MUST NOT reach production

   • The 20250923205334_allow_anon_access_for_dev.sql migration allows anonymous access
   • This is documented in RLS_CONFIG.md but consider adding a safety check:

   DO $$
   BEGIN
     IF current_setting('app.environment', true) != 'development' THEN
       RAISE EXCEPTION 'This migration is for development only!';
     END IF;
   END $$;

2. Input Sanitization Missing

   • User inputs (response_text, action descriptions) are not sanitized
   • Consider adding XSS protection before display

3. Platform Detection Weakness

   • Mac detection uses user agent string which can be spoofed:

   const isMac = navigator.userAgent.toUpperCase().indexOf('MAC') >= 0;

   • Consider using navigator.platform or feature detection instead

❌ Critical: No Tests for New Features

The PR adds significant functionality but includes no tests:

Missing Component Tests:

• SaveStatus.svelte - Visual feedback component
• UndoButton.svelte - User interaction component
• QuestionCard.svelte - Complex autosave logic
• ActionsCRUD.svelte - CRUD operations

Missing Integration Tests:

• Autosave flow (success/failure scenarios)
• Undo functionality with keyboard shortcuts
• Cascade deletion behavior
• RLS policy enforcement

Example test structure needed:

describe('QuestionCard Autosave', () => {
    test('detects changes when text is modified', async () => {
        const { getByRole } = render(QuestionCard);
        const textarea = getByRole('textbox');
        await userEvent.type(textarea, 'New text');
        expect(getByRole('button', { name: 'OK' })).toBeEnabled();
    });

    test('handles Ctrl+Z undo', async () => {
        // Test keyboard shortcut behavior
    });

    test('saves privacy settings automatically', async () => {
        // Test automatic privacy save
    });
});

Positive Aspects:

1. Component Architecture: Good separation of concerns with SaveStatus and UndoButton
2. Database Layer: Clean removal of versioning complexity
3. Naming Conventions: Follows established patterns consistently
4. Error Handling: Basic implementation present, could be enhanced

Suggestions for Improvement:

1. Extract Reusable Logic

   • Consider creating a custom autosave hook/store for reuse across components

2. Improve Error Recovery

   • Add retry logic for failed saves:

   const saveWithRetry = async (fn: Function, retries = 3) => {
       for (let i = 0; i < retries; i++) {
           try {
               return await fn();
           } catch (error) {
               if (i === retries - 1) throw error;
               await new Promise(r => setTimeout(r, 1000 * Math.pow(2, i)));
           }
       }
   };

3. Add Loading States

   • Consider skeleton loaders instead of "Loading..." text

4. Accessibility Enhancements

   • Add aria-live regions for save status announcements
   • Ensure keyboard navigation works for all interactive elements

🚨 High Priority (Must Fix):

1. Add comprehensive test coverage for all new components and features
2. Remove console.log statements from production code
3. Fix the privacy toggle race condition
4. Add navigation guards to prevent data loss

⚠️ Medium Priority (Should Fix):

1. Implement input debouncing to improve performance
2. Add input sanitization for XSS protection
3. Improve error recovery with retry logic
4. Ensure dev RLS migration never reaches production

💡 Low Priority (Nice to Have):

1. Extract autosave logic into reusable patterns
2. Optimize state management by combining related states
3. Add skeleton loaders for better UX
4. Enhance accessibility with ARIA announcements

This is a well-executed PR that successfully implements autosave functionality with good separation of concerns. The implementation aligns well with the project's architecture patterns and conventions outlined in CLAUDE.md. The separation between privacy saves (automatic) and content saves (manual with OK button) provides a good balance between automation and user control.

Key Strengths:

• Clean implementation of the autosave pattern with proper state management
• Good separation of concerns between privacy settings and response content
• Thoughtful UX with visual feedback components (SaveStatus, UndoButton)
• Proper cascade deletion at the database level
• Comprehensive RLS implementation with development/production separation
• Mobile-responsive improvements are well thought out

✅ Strong Security Implementation:

1. Row Level Security: Comprehensive RLS policies properly separate authenticated user access
2. Access Control: Each table has appropriate CRUD policies scoped to user data
3. Cascade Deletion: Properly implemented at database level preventing orphaned records
4. Service Role Access: Admin operations properly gated

⚠️ Critical Security Considerations:

1. Development RLS Migration MUST NOT reach production

   • The 20250923205334_allow_anon_access_for_dev.sql migration allows anonymous access to ALL user data
   • While well-documented in RLS_CONFIG.md, this is a critical vulnerability if deployed to production

   Recommendation: Add safety check to the migration:

   DO $$
   BEGIN
     IF current_setting('app.environment', true) != 'development' THEN
       RAISE EXCEPTION 'This migration is for development only!';
     END IF;
   END $$;

2. Input Sanitization Missing

   • User inputs (response_text, action descriptions) are not sanitized before storage/display
   • Potential XSS vulnerability

   Recommendation: Add sanitization in QuestionCard.svelte:

   import DOMPurify from 'isomorphic-dompurify';
   const sanitizedText = DOMPurify.sanitize(responseText);

3. Platform Detection Weakness

   • Mac detection uses user agent string which can be spoofed (line 243)
   • Consider using navigator.platform instead

1. Race Condition in Privacy Toggle

In QuestionCard.svelte lines 144-163:

const toggleVisibility = async () => {
    const previousVisibility = visibility;
    const newVisibility = visibility === 'public' ? 'private' : 'public';
    
    // Optimistic update - change UI immediately
    visibility = newVisibility;
    
    try {
        const result = await savePrivacySetting(newVisibility);
        
        if (!result.success) {
            // Rollback on failure
            visibility = previousVisibility;
        }
    } catch (error) {
        // Rollback on error
        visibility = previousVisibility;
        console.error('Failed to toggle visibility:', error);
    }
};

Good implementation with optimistic updates and rollback! ✅

2. Potential Duplicate Response Creation

The upsertResponse function (responses.ts:200-220) tries to update first, then create if update fails. This could create duplicates in high-concurrency scenarios.

Fix: Use Supabase's native upsert:

const { data, error } = await supabase
    .from('responses')
    .upsert({
        ...responseData,
        user_id: userId,
        question_id: questionId
    }, {
        onConflict: 'user_id,question_id'
    });

3. Missing Navigation Guards

Users can lose unsaved changes if they navigate away when hasChanges === true.

Fix: Add beforeunload handler:

$effect(() => {
    const handler = (e: BeforeUnloadEvent) => {
        if (hasChanges) {
            e.preventDefault();
            e.returnValue = '';
        }
    };
    window.addEventListener('beforeunload', handler);
    return () => window.removeEventListener('beforeunload', handler);
});

4. Console.log Statements in Production

Multiple debug logs should be removed:

• QuestionCard.svelte: lines 42, 55
• responses.ts: lines 127-169, 183-221, 234-259

1. Input Handling Without Debouncing

The handleInput function runs on every keystroke without debouncing:

Fix:

import { debounce } from '$lib/utils';
const handleInput = debounce(() => {
    canUndo = true;
    checkForChanges();
}, 300);

2. State Management Optimization

Multiple related $state variables could be combined:

// Instead of:
let privacySaveStatus = $state('idle');
let privacySaveError = $state<string | null>(null);

// Consider:
let privacySave = $state({
    status: 'idle' as 'idle' | 'saving' | 'saved' | 'error',
    error: null as string | null
});

3. Database Query Efficiency ✅

Good use of database-level CASCADE deletion instead of application-level loops - this is the correct approach!

❌ No Tests for New Features

This PR adds significant functionality but includes no tests. Per CLAUDE.md, the project requires 80% coverage for critical paths.

Missing Tests:

• QuestionCard.svelte - Complex autosave logic
• ActionsCRUD.svelte - CRUD operations
• SaveStatus.svelte - Visual feedback component
• UndoButton.svelte - User interaction component
• Database service functions (upsertResponse, etc.)
• RLS policy enforcement

Example test structure needed:

describe('QuestionCard Autosave', () => {
    test('detects changes when text is modified', async () => {
        const { getByRole } = render(QuestionCard);
        const textarea = getByRole('textbox');
        await userEvent.type(textarea, 'New text');
        expect(getByRole('button', { name: 'OK' })).toBeEnabled();
    });

    test('handles Ctrl+Z undo', async () => {
        // Test keyboard shortcut behavior
    });

    test('saves privacy settings automatically', async () => {
        // Test automatic privacy save
    });

    test('prevents duplicate response creation', async () => {
        // Test race condition handling
    });
});

This is the biggest gap and should be addressed before merging.

Positive Aspects:

1. ✅ Component Architecture: Good separation of concerns
2. ✅ Naming Conventions: Follows project standards consistently
3. ✅ Context Usage: Proper use of Svelte 5's $state and context patterns
4. ✅ Database Design: Clean removal of versioning complexity
5. ✅ Mobile First: Thoughtful responsive design

Suggestions for Improvement:

1. Extract Autosave Logic

   // Create reusable composable
   export function useAutosave() {
       const hasChanges = $state(false);
       const isSaving = $state(false);
       const saveError = $state<string | null>(null);
       // ... common autosave logic
       return { hasChanges, isSaving, saveError, save };
   }

2. Add Error Recovery

   const saveWithRetry = async (fn: Function, retries = 3) => {
       for (let i = 0; i < retries; i++) {
           try {
               return await fn();
           } catch (error) {
               if (i === retries - 1) throw error;
               await new Promise(r => setTimeout(r, 1000 * Math.pow(2, i)));
           }
       }
   };

3. Improve Accessibility

   • Add aria-live regions for save status announcements
   • Include aria-describedby for error messages
   • Ensure keyboard navigation works for all interactive elements

4. Improve Input Sanitization

   • The emailBuilder.ts shows DOMPurify is already available
   • Apply same sanitization pattern to user inputs in QuestionCard

🚨 High Priority (Must Fix):

1. Add comprehensive test coverage - This is the biggest gap
2. Remove console.log statements from production code
3. Add navigation guards - Prevent data loss
4. Ensure dev RLS migration safety - Add environment check

⚠️ Medium Priority (Should Fix):

1. Add input debouncing - Improve performance
2. Add input sanitization - XSS protection
3. Use native upsert - Prevent duplicate responses
4. Improve platform detection - Use more reliable method

💡 Low Priority (Nice to Have):

1. Extract autosave logic - Create reusable patterns
2. Add error recovery - Retry failed saves
3. Optimize state management - Combine related states
4. Enhance accessibility - ARIA improvements

This is a well-executed PR that successfully implements autosave functionality with good separation of concerns. The implementation aligns well with the project's architecture patterns and conventions outlined in CLAUDE.md. The separation between privacy saves (automatic) and content saves (manual with OK button) provides a good balance between automation and user control.

Key Strengths:

• Clean implementation of the autosave pattern with proper state management
• Good separation of concerns between privacy settings and response content
• Thoughtful UX with visual feedback components (SaveStatus, UndoButton)
• Proper cascade deletion at the database level
• Comprehensive RLS implementation with development/production separation
• Mobile-responsive improvements are well thought out

✅ Strong Security Implementation:

1. Row Level Security: Comprehensive RLS policies properly separate authenticated user access
2. Access Control: Each table has appropriate CRUD policies scoped to user data
3. Cascade Deletion: Properly implemented at database level preventing orphaned records
4. Service Role Access: Admin operations properly gated

⚠️ Critical Security Considerations:

1. Development RLS Migration MUST NOT reach production

   • The 20250923205334_allow_anon_access_for_dev.sql migration allows anonymous access to ALL user data
   • While well-documented in RLS_CONFIG.md, this is a critical vulnerability if deployed to production

   Recommendation: Add safety check to the migration:

   DO $$
   BEGIN
     IF current_setting('app.environment', true) != 'development' THEN
       RAISE EXCEPTION 'This migration is for development only!';
     END IF;
   END $$;

2. Input Sanitization Missing

   • User inputs (response_text, action descriptions) are not sanitized before storage/display
   • Potential XSS vulnerability

   Recommendation: Add sanitization in QuestionCard.svelte:

   import DOMPurify from 'isomorphic-dompurify';
   const sanitizedText = DOMPurify.sanitize(responseText);

3. Platform Detection Weakness

   • Mac detection uses user agent string which can be spoofed (line 243)
   • Consider using navigator.platform instead

1. Race Condition in Privacy Toggle

In QuestionCard.svelte lines 144-163:

const toggleVisibility = async () => {
    const previousVisibility = visibility;
    const newVisibility = visibility === 'public' ? 'private' : 'public';
    
    // Optimistic update - change UI immediately
    visibility = newVisibility;
    
    try {
        const result = await savePrivacySetting(newVisibility);
        
        if (!result.success) {
            // Rollback on failure
            visibility = previousVisibility;
        }
    } catch (error) {
        // Rollback on error
        visibility = previousVisibility;
        console.error('Failed to toggle visibility:', error);
    }
};

Good implementation with optimistic updates and rollback! ✅

2. Potential Duplicate Response Creation

The upsertResponse function (responses.ts:200-220) tries to update first, then create if update fails. This could create duplicates in high-concurrency scenarios.

Fix: Use Supabase's native upsert:

const { data, error } = await supabase
    .from('responses')
    .upsert({
        ...responseData,
        user_id: userId,
        question_id: questionId
    }, {
        onConflict: 'user_id,question_id'
    });

3. Missing Navigation Guards

Users can lose unsaved changes if they navigate away when hasChanges === true.

Fix: Add beforeunload handler:

$effect(() => {
    const handler = (e: BeforeUnloadEvent) => {
        if (hasChanges) {
            e.preventDefault();
            e.returnValue = '';
        }
    };
    window.addEventListener('beforeunload', handler);
    return () => window.removeEventListener('beforeunload', handler);
});

4. Console.log Statements in Production

Multiple debug logs should be removed:

• QuestionCard.svelte: lines 42, 55
• responses.ts: lines 127-169, 183-221, 234-259

1. Input Handling Without Debouncing

The handleInput function runs on every keystroke without debouncing:

Fix:

import { debounce } from '$lib/utils';
const handleInput = debounce(() => {
    canUndo = true;
    checkForChanges();
}, 300);

2. State Management Optimization

Multiple related $state variables could be combined:

// Instead of:
let privacySaveStatus = $state('idle');
let privacySaveError = $state<string | null>(null);

// Consider:
let privacySave = $state({
    status: 'idle' as 'idle' | 'saving' | 'saved' | 'error',
    error: null as string | null
});

3. Database Query Efficiency ✅

Good use of database-level CASCADE deletion instead of application-level loops - this is the correct approach!

❌ No Tests for New Features

This PR adds significant functionality but includes no tests. Per CLAUDE.md, the project requires 80% coverage for critical paths.

Missing Tests:

• QuestionCard.svelte - Complex autosave logic
• ActionsCRUD.svelte - CRUD operations
• SaveStatus.svelte - Visual feedback component
• UndoButton.svelte - User interaction component
• Database service functions (upsertResponse, etc.)
• RLS policy enforcement

Example test structure needed:

describe('QuestionCard Autosave', () => {
    test('detects changes when text is modified', async () => {
        const { getByRole } = render(QuestionCard);
        const textarea = getByRole('textbox');
        await userEvent.type(textarea, 'New text');
        expect(getByRole('button', { name: 'OK' })).toBeEnabled();
    });

    test('handles Ctrl+Z undo', async () => {
        // Test keyboard shortcut behavior
    });

    test('saves privacy settings automatically', async () => {
        // Test automatic privacy save
    });

    test('prevents duplicate response creation', async () => {
        // Test race condition handling
    });
});

This is the biggest gap and should be addressed before merging.

Positive Aspects:

1. ✅ Component Architecture: Good separation of concerns
2. ✅ Naming Conventions: Follows project standards consistently
3. ✅ Context Usage: Proper use of Svelte 5's $state and context patterns
4. ✅ Database Design: Clean removal of versioning complexity
5. ✅ Mobile First: Thoughtful responsive design

Suggestions for Improvement:

1. Extract Autosave Logic

   // Create reusable composable
   export function useAutosave() {
       const hasChanges = $state(false);
       const isSaving = $state(false);
       const saveError = $state<string | null>(null);
       // ... common autosave logic
       return { hasChanges, isSaving, saveError, save };
   }

2. Add Error Recovery

   const saveWithRetry = async (fn: Function, retries = 3) => {
       for (let i = 0; i < retries; i++) {
           try {
               return await fn();
           } catch (error) {
               if (i === retries - 1) throw error;
               await new Promise(r => setTimeout(r, 1000 * Math.pow(2, i)));
           }
       }
   };

3. Improve Accessibility

   • Add aria-live regions for save status announcements
   • Include aria-describedby for error messages
   • Ensure keyboard navigation works for all interactive elements

4. Improve Input Sanitization

   • The emailBuilder.ts shows DOMPurify is already available
   • Apply same sanitization pattern to user inputs in QuestionCard

🚨 High Priority (Must Fix):

1. Add comprehensive test coverage - This is the biggest gap
2. Remove console.log statements from production code
3. Add navigation guards - Prevent data loss
4. Ensure dev RLS migration safety - Add environment check

⚠️ Medium Priority (Should Fix):

1. Add input debouncing - Improve performance
2. Add input sanitization - XSS protection
3. Use native upsert - Prevent duplicate responses
4. Improve platform detection - Use more reliable method

💡 Low Priority (Nice to Have):

1. Extract autosave logic - Create reusable patterns
2. Add error recovery - Retry failed saves
3. Optimize state management - Combine related states
4. Enhance accessibility - ARIA improvements

This is a well-executed PR that successfully implements autosave functionality with good separation of concerns. The implementation aligns well with the project's architecture patterns and conventions outlined in CLAUDE.md. The separation between privacy saves (automatic) and content saves (manual with OK button) provides a good balance between automation and user control.

Key Strengths:

• Clean implementation of the autosave pattern with proper state management
• Good separation of concerns between privacy settings and response content
• Thoughtful UX with visual feedback components (SaveStatus, UndoButton)
• Proper cascade deletion at the database level
• Comprehensive RLS implementation with development/production separation
• Mobile-responsive improvements are well thought out

✅ Strong Security Implementation:

1. Row Level Security: Comprehensive RLS policies properly separate authenticated user access
2. Access Control: Each table has appropriate CRUD policies scoped to user data
3. Cascade Deletion: Properly implemented at database level preventing orphaned records
4. Service Role Access: Admin operations properly gated

⚠️ Critical Security Considerations:

1. Development RLS Migration MUST NOT reach production

   • The 20250923205334_allow_anon_access_for_dev.sql migration allows anonymous access to ALL user data
   • While well-documented in RLS_CONFIG.md, this is a critical vulnerability if deployed to production

   Recommendation: Add safety check to the migration:

   DO $$
   BEGIN
     IF current_setting('app.environment', true) != 'development' THEN
       RAISE EXCEPTION 'This migration is for development only!';
     END IF;
   END $$;

2. Input Sanitization Missing

   • User inputs (response_text, action descriptions) are not sanitized before storage/display
   • Potential XSS vulnerability

   Recommendation: Add sanitization in QuestionCard.svelte:

   import DOMPurify from 'isomorphic-dompurify';
   const sanitizedText = DOMPurify.sanitize(responseText);

3. Platform Detection Weakness

   • Mac detection uses user agent string which can be spoofed (line 243)
   • Consider using navigator.platform instead

1. Race Condition in Privacy Toggle

In QuestionCard.svelte lines 144-163:

const toggleVisibility = async () => {
    const previousVisibility = visibility;
    const newVisibility = visibility === 'public' ? 'private' : 'public';
    
    // Optimistic update - change UI immediately
    visibility = newVisibility;
    
    try {
        const result = await savePrivacySetting(newVisibility);
        
        if (!result.success) {
            // Rollback on failure
            visibility = previousVisibility;
        }
    } catch (error) {
        // Rollback on error
        visibility = previousVisibility;
        console.error('Failed to toggle visibility:', error);
    }
};

Good implementation with optimistic updates and rollback! ✅

2. Potential Duplicate Response Creation

The upsertResponse function (responses.ts:200-220) tries to update first, then create if update fails. This could create duplicates in high-concurrency scenarios.

Fix: Use Supabase's native upsert:

const { data, error } = await supabase
    .from('responses')
    .upsert({
        ...responseData,
        user_id: userId,
        question_id: questionId
    }, {
        onConflict: 'user_id,question_id'
    });

3. Missing Navigation Guards

Users can lose unsaved changes if they navigate away when hasChanges === true.

Fix: Add beforeunload handler:

$effect(() => {
    const handler = (e: BeforeUnloadEvent) => {
        if (hasChanges) {
            e.preventDefault();
            e.returnValue = '';
        }
    };
    window.addEventListener('beforeunload', handler);
    return () => window.removeEventListener('beforeunload', handler);
});

4. Console.log Statements in Production

Multiple debug logs should be removed:

• QuestionCard.svelte: lines 42, 55
• responses.ts: lines 127-169, 183-221, 234-259

1. Input Handling Without Debouncing

The handleInput function runs on every keystroke without debouncing:

Fix:

import { debounce } from '$lib/utils';
const handleInput = debounce(() => {
    canUndo = true;
    checkForChanges();
}, 300);

2. State Management Optimization

Multiple related $state variables could be combined:

// Instead of:
let privacySaveStatus = $state('idle');
let privacySaveError = $state<string | null>(null);

// Consider:
let privacySave = $state({
    status: 'idle' as 'idle' | 'saving' | 'saved' | 'error',
    error: null as string | null
});

3. Database Query Efficiency ✅

Good use of database-level CASCADE deletion instead of application-level loops - this is the correct approach!

❌ No Tests for New Features

This PR adds significant functionality but includes no tests. Per CLAUDE.md, the project requires 80% coverage for critical paths.

Missing Tests:

• QuestionCard.svelte - Complex autosave logic
• ActionsCRUD.svelte - CRUD operations
• SaveStatus.svelte - Visual feedback component
• UndoButton.svelte - User interaction component
• Database service functions (upsertResponse, etc.)
• RLS policy enforcement

Example test structure needed:

describe('QuestionCard Autosave', () => {
    test('detects changes when text is modified', async () => {
        const { getByRole } = render(QuestionCard);
        const textarea = getByRole('textbox');
        await userEvent.type(textarea, 'New text');
        expect(getByRole('button', { name: 'OK' })).toBeEnabled();
    });

    test('handles Ctrl+Z undo', async () => {
        // Test keyboard shortcut behavior
    });

    test('saves privacy settings automatically', async () => {
        // Test automatic privacy save
    });

    test('prevents duplicate response creation', async () => {
        // Test race condition handling
    });
});

This is the biggest gap and should be addressed before merging.

Positive Aspects:

1. ✅ Component Architecture: Good separation of concerns
2. ✅ Naming Conventions: Follows project standards consistently
3. ✅ Context Usage: Proper use of Svelte 5's $state and context patterns
4. ✅ Database Design: Clean removal of versioning complexity
5. ✅ Mobile First: Thoughtful responsive design

Suggestions for Improvement:

1. Extract Autosave Logic

   // Create reusable composable
   export function useAutosave() {
       const hasChanges = $state(false);
       const isSaving = $state(false);
       const saveError = $state<string | null>(null);
       // ... common autosave logic
       return { hasChanges, isSaving, saveError, save };
   }

2. Add Error Recovery

   const saveWithRetry = async (fn: Function, retries = 3) => {
       for (let i = 0; i < retries; i++) {
           try {
               return await fn();
           } catch (error) {
               if (i === retries - 1) throw error;
               await new Promise(r => setTimeout(r, 1000 * Math.pow(2, i)));
           }
       }
   };

3. Improve Accessibility

   • Add aria-live regions for save status announcements
   • Include aria-describedby for error messages
   • Ensure keyboard navigation works for all interactive elements

4. Improve Input Sanitization

   • The emailBuilder.ts shows DOMPurify is already available
   • Apply same sanitization pattern to user inputs in QuestionCard

🚨 High Priority (Must Fix):

1. Add comprehensive test coverage - This is the biggest gap
2. Remove console.log statements from production code
3. Add navigation guards - Prevent data loss
4. Ensure dev RLS migration safety - Add environment check

⚠️ Medium Priority (Should Fix):

1. Add input debouncing - Improve performance
2. Add input sanitization - XSS protection
3. Use native upsert - Prevent duplicate responses
4. Improve platform detection - Use more reliable method

💡 Low Priority (Nice to Have):

1. Extract autosave logic - Create reusable patterns
2. Add error recovery - Retry failed saves
3. Optimize state management - Combine related states
4. Enhance accessibility - ARIA improvements

This is a well-executed PR that successfully implements autosave functionality with good separation of concerns. The implementation aligns well with the project's architecture patterns and conventions outlined in CLAUDE.md. The separation between privacy saves (automatic) and content saves (manual with OK button) provides a good balance between automation and user control.

Key Strengths:

• Clean implementation of the autosave pattern with proper state management
• Good separation of concerns between privacy settings and response content
• Thoughtful UX with visual feedback components (SaveStatus, UndoButton)
• Proper cascade deletion at the database level
• Comprehensive RLS implementation with development/production separation
• Mobile-responsive improvements are well thought out

✅ Strong Security Implementation:

1. Row Level Security: Comprehensive RLS policies properly separate authenticated user access
2. Access Control: Each table has appropriate CRUD policies scoped to user data
3. Cascade Deletion: Properly implemented at database level preventing orphaned records
4. Service Role Access: Admin operations properly gated

⚠️ Critical Security Considerations:

1. Development RLS Migration MUST NOT reach production

   • The 20250923205334_allow_anon_access_for_dev.sql migration allows anonymous access to ALL user data
   • While well-documented in RLS_CONFIG.md, this is a critical vulnerability if deployed to production

   Recommendation: Add safety check to the migration:

   DO $$
   BEGIN
     IF current_setting('app.environment', true) != 'development' THEN
       RAISE EXCEPTION 'This migration is for development only!';
     END IF;
   END $$;

2. Input Sanitization Missing

   • User inputs (response_text, action descriptions) are not sanitized before storage/display
   • Potential XSS vulnerability

   Recommendation: Add sanitization in QuestionCard.svelte:

   import DOMPurify from 'isomorphic-dompurify';
   const sanitizedText = DOMPurify.sanitize(responseText);

3. Platform Detection Weakness

   • Mac detection uses user agent string which can be spoofed (line 243)
   • Consider using navigator.platform instead

1. Race Condition in Privacy Toggle

In QuestionCard.svelte lines 144-163:

const toggleVisibility = async () => {
    const previousVisibility = visibility;
    const newVisibility = visibility === 'public' ? 'private' : 'public';
    
    // Optimistic update - change UI immediately
    visibility = newVisibility;
    
    try {
        const result = await savePrivacySetting(newVisibility);
        
        if (!result.success) {
            // Rollback on failure
            visibility = previousVisibility;
        }
    } catch (error) {
        // Rollback on error
        visibility = previousVisibility;
        console.error('Failed to toggle visibility:', error);
    }
};

Good implementation with optimistic updates and rollback! ✅

2. Potential Duplicate Response Creation

The upsertResponse function (responses.ts:200-220) tries to update first, then create if update fails. This could create duplicates in high-concurrency scenarios.

Fix: Use Supabase's native upsert:

const { data, error } = await supabase
    .from('responses')
    .upsert({
        ...responseData,
        user_id: userId,
        question_id: questionId
    }, {
        onConflict: 'user_id,question_id'
    });

3. Missing Navigation Guards

Users can lose unsaved changes if they navigate away when hasChanges === true.

Fix: Add beforeunload handler:

$effect(() => {
    const handler = (e: BeforeUnloadEvent) => {
        if (hasChanges) {
            e.preventDefault();
            e.returnValue = '';
        }
    };
    window.addEventListener('beforeunload', handler);
    return () => window.removeEventListener('beforeunload', handler);
});

4. Console.log Statements in Production

Multiple debug logs should be removed:

• QuestionCard.svelte: lines 42, 55
• responses.ts: lines 127-169, 183-221, 234-259

1. Input Handling Without Debouncing

The handleInput function runs on every keystroke without debouncing:

Fix:

import { debounce } from '$lib/utils';
const handleInput = debounce(() => {
    canUndo = true;
    checkForChanges();
}, 300);

2. State Management Optimization

Multiple related $state variables could be combined:

// Instead of:
let privacySaveStatus = $state('idle');
let privacySaveError = $state<string | null>(null);

// Consider:
let privacySave = $state({
    status: 'idle' as 'idle' | 'saving' | 'saved' | 'error',
    error: null as string | null
});

3. Database Query Efficiency ✅

Good use of database-level CASCADE deletion instead of application-level loops - this is the correct approach!

❌ No Tests for New Features

This PR adds significant functionality but includes no tests. Per CLAUDE.md, the project requires 80% coverage for critical paths.

Missing Tests:

• QuestionCard.svelte - Complex autosave logic
• ActionsCRUD.svelte - CRUD operations
• SaveStatus.svelte - Visual feedback component
• UndoButton.svelte - User interaction component
• Database service functions (upsertResponse, etc.)
• RLS policy enforcement

Example test structure needed:

describe('QuestionCard Autosave', () => {
    test('detects changes when text is modified', async () => {
        const { getByRole } = render(QuestionCard);
        const textarea = getByRole('textbox');
        await userEvent.type(textarea, 'New text');
        expect(getByRole('button', { name: 'OK' })).toBeEnabled();
    });

    test('handles Ctrl+Z undo', async () => {
        // Test keyboard shortcut behavior
    });

    test('saves privacy settings automatically', async () => {
        // Test automatic privacy save
    });

    test('prevents duplicate response creation', async () => {
        // Test race condition handling
    });
});

This is the biggest gap and should be addressed before merging.

Positive Aspects:

1. ✅ Component Architecture: Good separation of concerns
2. ✅ Naming Conventions: Follows project standards consistently
3. ✅ Context Usage: Proper use of Svelte 5's $state and context patterns
4. ✅ Database Design: Clean removal of versioning complexity
5. ✅ Mobile First: Thoughtful responsive design

Suggestions for Improvement:

1. Extract Autosave Logic

   // Create reusable composable
   export function useAutosave() {
       const hasChanges = $state(false);
       const isSaving = $state(false);
       const saveError = $state<string | null>(null);
       // ... common autosave logic
       return { hasChanges, isSaving, saveError, save };
   }

2. Add Error Recovery

   const saveWithRetry = async (fn: Function, retries = 3) => {
       for (let i = 0; i < retries; i++) {
           try {
               return await fn();
           } catch (error) {
               if (i === retries - 1) throw error;
               await new Promise(r => setTimeout(r, 1000 * Math.pow(2, i)));
           }
       }
   };

3. Improve Accessibility

   • Add aria-live regions for save status announcements
   • Include aria-describedby for error messages
   • Ensure keyboard navigation works for all interactive elements

4. Improve Input Sanitization

   • The emailBuilder.ts shows DOMPurify is already available
   • Apply same sanitization pattern to user inputs in QuestionCard

🚨 High Priority (Must Fix):

1. Add comprehensive test coverage - This is the biggest gap
2. Remove console.log statements from production code
3. Add navigation guards - Prevent data loss
4. Ensure dev RLS migration safety - Add environment check

⚠️ Medium Priority (Should Fix):

1. Add input debouncing - Improve performance
2. Add input sanitization - XSS protection
3. Use native upsert - Prevent duplicate responses
4. Improve platform detection - Use more reliable method

💡 Low Priority (Nice to Have):

1. Extract autosave logic - Create reusable patterns
2. Add error recovery - Retry failed saves
3. Optimize state management - Combine related states
4. Enhance accessibility - ARIA improvements

This is a well-executed PR that successfully implements autosave functionality with good separation of concerns. The implementation aligns well with the project's architecture patterns and conventions outlined in CLAUDE.md. The separation between privacy saves (automatic) and content saves (manual with OK button) provides a good balance between automation and user control.

Key Strengths:

• Clean implementation of the autosave pattern with proper state management
• Good separation of concerns between privacy settings and response content
• Thoughtful UX with visual feedback components (SaveStatus, UndoButton)
• Proper cascade deletion at the database level
• Comprehensive RLS implementation with development/production separation
• Mobile-responsive improvements are well thought out

✅ Strong Security Implementation:

1. Row Level Security: Comprehensive RLS policies properly separate authenticated user access
2. Access Control: Each table has appropriate CRUD policies scoped to user data
3. Cascade Deletion: Properly implemented at database level preventing orphaned records
4. Service Role Access: Admin operations properly gated

⚠️ Critical Security Considerations:

1. Development RLS Migration MUST NOT reach production

   • The 20250923205334_allow_anon_access_for_dev.sql migration allows anonymous access to ALL user data
   • While well-documented in RLS_CONFIG.md, this is a critical vulnerability if deployed to production

   Recommendation: Add safety check to the migration:

   DO $$
   BEGIN
     IF current_setting('app.environment', true) != 'development' THEN
       RAISE EXCEPTION 'This migration is for development only!';
     END IF;
   END $$;

2. Input Sanitization Missing

   • User inputs (response_text, action descriptions) are not sanitized before storage/display
   • Potential XSS vulnerability

   Recommendation: Add sanitization in QuestionCard.svelte:

   import DOMPurify from 'isomorphic-dompurify';
   const sanitizedText = DOMPurify.sanitize(responseText);

3. Platform Detection Weakness

   • Mac detection uses user agent string which can be spoofed (line 243)
   • Consider using navigator.platform instead

1. Race Condition in Privacy Toggle

In QuestionCard.svelte lines 144-163:

const toggleVisibility = async () => {
    const previousVisibility = visibility;
    const newVisibility = visibility === 'public' ? 'private' : 'public';
    
    // Optimistic update - change UI immediately
    visibility = newVisibility;
    
    try {
        const result = await savePrivacySetting(newVisibility);
        
        if (!result.success) {
            // Rollback on failure
            visibility = previousVisibility;
        }
    } catch (error) {
        // Rollback on error
        visibility = previousVisibility;
        console.error('Failed to toggle visibility:', error);
    }
};

Good implementation with optimistic updates and rollback! ✅

2. Potential Duplicate Response Creation

The upsertResponse function (responses.ts:200-220) tries to update first, then create if update fails. This could create duplicates in high-concurrency scenarios.

Fix: Use Supabase's native upsert:

const { data, error } = await supabase
    .from('responses')
    .upsert({
        ...responseData,
        user_id: userId,
        question_id: questionId
    }, {
        onConflict: 'user_id,question_id'
    });

3. Missing Navigation Guards

Users can lose unsaved changes if they navigate away when hasChanges === true.

Fix: Add beforeunload handler:

$effect(() => {
    const handler = (e: BeforeUnloadEvent) => {
        if (hasChanges) {
            e.preventDefault();
            e.returnValue = '';
        }
    };
    window.addEventListener('beforeunload', handler);
    return () => window.removeEventListener('beforeunload', handler);
});

4. Console.log Statements in Production

Multiple debug logs should be removed:

• QuestionCard.svelte: lines 42, 55
• responses.ts: lines 127-169, 183-221, 234-259

1. Input Handling Without Debouncing

The handleInput function runs on every keystroke without debouncing:

Fix:

import { debounce } from '$lib/utils';
const handleInput = debounce(() => {
    canUndo = true;
    checkForChanges();
}, 300);

2. State Management Optimization

Multiple related $state variables could be combined:

// Instead of:
let privacySaveStatus = $state('idle');
let privacySaveError = $state<string | null>(null);

// Consider:
let privacySave = $state({
    status: 'idle' as 'idle' | 'saving' | 'saved' | 'error',
    error: null as string | null
});

3. Database Query Efficiency ✅

Good use of database-level CASCADE deletion instead of application-level loops - this is the correct approach!

❌ No Tests for New Features

This PR adds significant functionality but includes no tests. Per CLAUDE.md, the project requires 80% coverage for critical paths.

Missing Tests:

• QuestionCard.svelte - Complex autosave logic
• ActionsCRUD.svelte - CRUD operations
• SaveStatus.svelte - Visual feedback component
• UndoButton.svelte - User interaction component
• Database service functions (upsertResponse, etc.)
• RLS policy enforcement

Example test structure needed:

describe('QuestionCard Autosave', () => {
    test('detects changes when text is modified', async () => {
        const { getByRole } = render(QuestionCard);
        const textarea = getByRole('textbox');
        await userEvent.type(textarea, 'New text');
        expect(getByRole('button', { name: 'OK' })).toBeEnabled();
    });

    test('handles Ctrl+Z undo', async () => {
        // Test keyboard shortcut behavior
    });

    test('saves privacy settings automatically', async () => {
        // Test automatic privacy save
    });

    test('prevents duplicate response creation', async () => {
        // Test race condition handling
    });
});

This is the biggest gap and should be addressed before merging.

Positive Aspects:

1. ✅ Component Architecture: Good separation of concerns
2. ✅ Naming Conventions: Follows project standards consistently
3. ✅ Context Usage: Proper use of Svelte 5's $state and context patterns
4. ✅ Database Design: Clean removal of versioning complexity
5. ✅ Mobile First: Thoughtful responsive design

Suggestions for Improvement:

1. Extract Autosave Logic

   // Create reusable composable
   export function useAutosave() {
       const hasChanges = $state(false);
       const isSaving = $state(false);
       const saveError = $state<string | null>(null);
       // ... common autosave logic
       return { hasChanges, isSaving, saveError, save };
   }

2. Add Error Recovery

   const saveWithRetry = async (fn: Function, retries = 3) => {
       for (let i = 0; i < retries; i++) {
           try {
               return await fn();
           } catch (error) {
               if (i === retries - 1) throw error;
               await new Promise(r => setTimeout(r, 1000 * Math.pow(2, i)));
           }
       }
   };

3. Improve Accessibility

   • Add aria-live regions for save status announcements
   • Include aria-describedby for error messages
   • Ensure keyboard navigation works for all interactive elements

4. Improve Input Sanitization

   • The emailBuilder.ts shows DOMPurify is already available
   • Apply same sanitization pattern to user inputs in QuestionCard