refactor: remove legacy comments referencing intent-0.2.4 from markdown and task block components

Author: phodal

src/app/globals.css

@@ -222,7 +222,6 @@ body {
 }
 
 /* ─── MarkdownViewer Styles ──────────────────────────────────────────── */
-/* Based on intent-0.2.4's MarkdownViewer.svelte styles */
 
 .markdown-viewer {
   position: relative;

src/client/components/markdown-viewer.tsx

@@ -3,7 +3,6 @@
 /**
  * MarkdownViewer - Read-only tiptap markdown renderer.
  *
- * Inspired by intent-0.2.4's MarkdownViewer.svelte:
  *   - Uses `marked` to convert markdown → HTML
  *   - Uses tiptap `Editor` (read-only) for interactive rendering
  *   - Supports task lists, code blocks with syntax highlighting, tables, etc.

src/client/components/mermaid-renderer.tsx

@@ -3,7 +3,6 @@
 /**
  * MermaidRenderer - React component for rendering mermaid diagrams.
  *
- * Inspired by intent-0.2.4's MermaidRenderer.svelte:
  *   - Renders mermaid code into SVG
  *   - Supports fullscreen expansion
  *   - Auto-updates on theme change

src/client/utils/task-block-parser.ts

@@ -2,7 +2,6 @@
  * Task Block Parser
  *
  * Parses `@@@task` / `@@@tasks` blocks from Routa agent responses.
- * Based on intent-0.2.4's task-block-parser.ts pattern.
  *
  * Format:
  * ```