fix: harden canvas review and runtime bootstrap

[carlosflorencio]

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PR walkthrough: Open the visual walkthrough

The canvas release-review dialog was still constrained by the UI primitive's responsive width, and valid scriptless HTML with omitted wrapper tags could fail runtime startup. This follow-up widens and verifies the review surface, preserves phone behavior, and keeps runtime bootstrap compatible with omitted wrappers and inert template content.

Important Changes

• Override the dialog primitive's sm:max-w-lg cap with the intended responsive 48rem desktop surface while preserving the full-height phone composition.
• Add a real 1280x720 Playwright flow that creates a permission-increasing release, verifies two permissions, checks the wide dialog bounds, and confirms the review region does not scroll.
• Support valid HTML entries with implied head/body wrappers and skip executable-looking content inside inert <template> elements when injecting the runtime bootstrap.
• Keep stored artifacts unchanged and cover served 200 responses plus the template insertion order with focused Go regressions.

Validation

• rtk go test ./internal/plugins/webapp
• pnpm exec vitest run components/settings/canvas-lifecycle-dialogs.test.tsx
• pnpm run typecheck
• pnpm run i18n:check && pnpm run i18n:ratchet
• Focused ESLint for the changed web and canvas E2E files
• pnpm e2e:run --project chromium tests/canvas/plugin-canvas.spec.ts --grep "wide without scrolling two permissions"
• Disposable PR asset capture at desktop 1280x720 and phone 390x844, with assets validated and compressed; the capture spec was removed after use.
• Normal pre-commit and commit-msg hooks, including Go lint, web lint, formatting, i18n, and Conventional Commits validation.

Checklist

• If I do not have repository write access and this is a large architectural change, I discussed the direction in a linked issue before opening this PR.
• This PR contains one logical change; unrelated work is split into separate PRs.
• I have performed a self-review of my code.
• I have manually tested my changes and they work as expected.
• My changes have tests that cover the new functionality and edge cases.
• If my change touches UI files (apps/web/), I have added or updated Playwright e2e tests in apps/web/e2e/ and verified them with make test-e2e.
• I checked whether this affects public docs in docs/public/** and updated them or noted why no docs change is needed.

Screenshots

Preview Environment

URL	https://kandev-pr-3628-bwo7.sprites.app
Commit	d86768a
Agent	Mock agent

Updates automatically on each push. Destroyed when the PR is closed.

[chatgpt-codex-connector]

Codex Review Summary

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-12T16:18:48.846396Z	8d20e12	PR opened

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📝 Summary

Summary by CodeRabbit

• Bug Fixes

  • Improved runtime startup injection for pages with omitted HTML, head, or body wrappers.
  • Bootstrap scripts are now placed correctly without being confused by scripts inside template content.
  • When no standard insertion point exists, startup code is appended to the page instead of failing.

• UI Improvements

  • Expanded the desktop canvas release review dialog to display permission details without unnecessary scrolling, while preserving responsive behavior on smaller screens.

• Tests

  • Added coverage for runtime injection and responsive canvas release dialogs.

Walkthrough

The changes make runtime bootstrap injection template-aware and support wrapperless HTML. They also update the canvas release dialog width and add fixture and end-to-end coverage for permission review.

Changes

Runtime bootstrap injection

Layer / File(s)	Summary
Template-aware bootstrap placement apps/backend/internal/plugins/webapp/runtime_bootstrap.go	The insertion logic tracks <template> nesting, ignores matching tags inside templates, and appends the bootstrap tag when no insertion point exists.
Bootstrap injection validation apps/backend/internal/plugins/webapp/runtime_test.go	Tests cover wrapperless HTML, bootstrap placement, response length, artifact preservation, and scripts inside templates.

Canvas release review

Layer / File(s)	Summary
Canvas release fixture support apps/web/e2e/tests/canvas/canvas-fixture.ts	Fixtures support configurable canvas capabilities, release listing, and exported session workspace access.
Responsive release dialog sizing apps/web/components/settings/canvas-release-review.tsx, apps/web/components/settings/canvas-lifecycle-dialogs.test.tsx	The dialog applies its 48rem maximum width from the sm breakpoint, with component coverage for the desktop surface.
Permission review end-to-end scenario apps/web/e2e/tests/canvas/plugin-canvas.spec.ts	The test publishes a permission-increasing release, opens the review dialog, and checks its width and permission summary.

Priority: ⬇️ Low

Estimated code review effort: 3 (Moderate) | ~25 minutes

Change: Bug fix

Merge Risk: 🟡 Moderate · up to 8d20e

Certain malformed-template or SVG documents can be served successfully without initializing the runtime correctly. These bootstrap-placement defects should be fixed before merge.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 20 functions across 6 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly summarizes the two main changes: hardening canvas review and runtime bootstrap behavior.
Description check	✅ Passed	The description includes the required summary, important changes, validation, and unchanged checklist. It directly explains the motivation, scope, tests, and expected behavior.

✨ Finishing Touches

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• Create PR with unit tests
• Commit unit tests in branch fix/canvas-review-followups

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_{A rabbit checks the template nest
The bootstrap hops to the proper place
Wide windows hold the review
Two permissions fit in view
Green tests twitch their noses
The canvas release quietly closes}

_{Comment @coderabbitai help to get the list of available commands.}

[claude]

Claude finished @carlosflorencio's task in 4m 22s —— View job

---

Code Review — fix/canvas-review-followups (8d20e12)

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Findings

Suggestion (recommended, doesn't block)

1. Dead bounds check after implied-wrapper fallback — apps/backend/internal/plugins/webapp/runtime_bootstrap.go:125–134

After the PR adds the if insertion < 0 { insertion = len(entry) } block, insertion is always in [0, len(entry)] by the time the final guard is reached. The existing if insertion < 0 || insertion > len(entry) check can no longer trigger.

// After these two preceding blocks...
if insertion < 0 { insertion = fallback }
if insertion < 0 { insertion = len(entry) }

// ...this guard is now unreachable:
if insertion < 0 || insertion > len(entry) {
    return -1, ErrRuntimeBootstrapUnavailable
}

It's harmless defensive code, but removing it (or adding a comment explaining it survives as a panic-net) would make the intent clear. As written, a reader might reasonably wonder what path is meant to reach it. Fix this →

2. Template-skipping test only exercises injectRuntimeBootstrap directly — apps/backend/internal/plugins/webapp/runtime_test.go:257–271

TestInjectRuntimeBootstrapSkipsTemplateContent calls the injection helper directly, not via runtime.Serve(). The other two bootstrap tests (TestRuntimeStartupBootstrapPreservesArtifact, TestRuntimeStartupBootstrapSupportsOmittedHTMLWrappers) both go through the full HTTP serve path with actual artifacts. This doesn't block — the injection function is the only site, and the other tests validate the plumbing — but a paired serve-path assertion (checking 200 + correct Content-Length when the entry has a template) would round out the coverage symmetry.

3. TestRuntimeStartupBootstrapSupportsOmittedHTMLWrappers uses deprecated strings.Index comparison directly — apps/backend/internal/plugins/webapp/runtime_test.go:242–244

if strings.Index(body, bootstrap) <= strings.Index(body, "<p>Hello</p>") {

strings.Index returns -1 when the needle is absent. If "<p>Hello</p>" somehow wasn't present, this condition would evaluate as N <= -1 (false), silently passing. The sibling test TestRuntimeStartupBootstrapPreservesArtifact uses the same pattern for the "before authored scripts" assertion (line 177). Since the entry is a literal constant in the test, absence is impossible, but an explicit t.Fatal-if-not-found guard before the positional comparison would protect against future refactors that swap the fixture string.

---

Summary

Severity	Count
Blocker	0
Suggestion	3

Verdict: Ready to merge

The backend changes are correct and well-structured. The template-depth tracking correctly handles nested templates, orphaned end tags (templateDepth clamps at 0), and start-vs-end tag routing. The implied-wrapper fallback (insertion = len(entry)) is a clean solution. The canvas-release-review.tsx change from max-w-[48rem] to sm:max-w-[48rem] correctly moves the constraint into the same responsive tier as the primitive's sm:max-w-lg, allowing the arbitrary value to win at the sm breakpoint. Unit and E2E coverage for both behaviours is solid.

[greptile-apps]

Greptile Summary

The PR widens the canvas release-review dialog, adds end-to-end coverage for permission review geometry, and expands runtime bootstrap placement to wrapperless HTML while skipping template content.

• The responsive desktop class now overrides the dialog primitive’s width cap.
• Runtime bootstrap insertion tracks template nesting and falls back to implied-body placement.
• Backend regressions cover wrapperless documents, artifact preservation, and balanced template content.
• Canvas E2E fixtures now support configurable permission sets and release lookup.
• The EOF fallback still mishandles an unclosed template, and the new E2E setup relies on timing rather than causal ordering.

Confidence Score: 4/5

The PR is not yet safe to merge because an unclosed template can produce a successful response whose runtime bootstrap is inert, and the new E2E flow must also satisfy the repository’s causal-wait requirement.

The EOF fallback ignores the remaining template depth and can silently turn a previously rejected entry into a canvas that times out during startup; the E2E setup also publishes on a fixed timer before its source write is guaranteed complete.

Files Needing Attention: apps/backend/internal/plugins/webapp/runtime_bootstrap.go; apps/web/e2e/tests/canvas/plugin-canvas.spec.ts

Important Files Changed

Filename	Overview
apps/backend/internal/plugins/webapp/runtime_bootstrap.go	Adds template-aware bootstrap placement and wrapperless EOF fallback, but can append the bootstrap inside an unclosed inert template.
apps/backend/internal/plugins/webapp/runtime_test.go	Adds focused coverage for wrapperless HTML, artifact preservation, and balanced template insertion order.
apps/web/components/settings/canvas-release-review.tsx	Correctly changes the desktop maximum-width utility so it overrides the dialog primitive at the same responsive modifier.
apps/web/e2e/tests/canvas/canvas-fixture.ts	Extends canvas fixtures with configurable capabilities, workspace access, and release lookup.
apps/web/e2e/tests/canvas/plugin-canvas.spec.ts	Adds real-browser geometry and scrolling coverage, but races source setup against a fixed delayed publication.

Sequence Diagram

sequenceDiagram
  participant Browser
  participant Runtime
  participant Tokenizer
  participant Entry as HTML entry
  Browser->>Runtime: GET canvas entry
  Runtime->>Entry: Read stored artifact
  Runtime->>Tokenizer: Find bootstrap insertion point
  Tokenizer-->>Runtime: Script/head/body boundary or EOF fallback
  Runtime->>Runtime: Inject host-runtime script
  Runtime-->>Browser: Serve transformed entry
  Browser->>Runtime: Load host-runtime.js
  Runtime-->>Browser: Install startup probe

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Actionable comments posted: 2

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Inline comments:
In `@apps/backend/internal/plugins/webapp/runtime_bootstrap.go`:
- Around line 125-130: Update injectRuntimeBootstrap so the insertion < 0 EOF
fallback is rejected when templateDepth remains positive, preventing bootstrap
injection into unclosed inert template content; preserve normal fallback
behavior for balanced entries. Add a parser-based regression test covering an
unclosed template such as <template><p>Hello and verify the entry is
not reported as successfully injected.
- Around line 143-145: Update the tag-processing logic around tagName and
updateRuntimeBootstrapTemplateDepth to track the parser namespace before
changing templateDepth, treating template as inert only in the HTML namespace
and not inside SVG or other foreign content. Ensure nested foreign-content
script handling preserves bootstrap insertion safety, and add a regression test
covering a template inside SVG.

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📥 Commits

Reviewing files that changed from the base of the PR and between 01afaf0 and 8d20e12.

📒 Files selected for processing (6)

• apps/backend/internal/plugins/webapp/runtime_bootstrap.go
• apps/backend/internal/plugins/webapp/runtime_test.go
• apps/web/components/settings/canvas-lifecycle-dialogs.test.tsx
• apps/web/components/settings/canvas-release-review.tsx
• apps/web/e2e/tests/canvas/canvas-fixture.ts
• apps/web/e2e/tests/canvas/plugin-canvas.spec.ts

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