Review comments should contain line of code (vibe-kanban) (#731)

* **Changes**
- Capture the relevant code line in each draft/comment so it’s stored alongside metadata and rendered in the Markdown output, with backtick-safe formatting for inline/triple code blocks (`frontend/src/contexts/ReviewProvider.tsx:4-107`).
- Pull the plain line text from the diff when a comment widget opens and stash it on the draft before saving (`frontend/src/components/DiffCard.tsx:140-155`).
- Pass the captured line through when persisting a new review comment (`frontend/src/components/diff/CommentWidgetLine.tsx:28-34`).

- Tests: `pnpm run check`

Consider spot-checking the review markdown in the UI to confirm the new code line snippet displays as expected.

* Line capture now trims trailing newline characters so inline code renders on a single line (`frontend/src/components/DiffCard.tsx:140-154`). `pnpm run check` still passes. Let me know if you spot any other formatting quirks.

* Cleanup script changes for task attempt 93f0100f-256d-4177-839d-53cb700d2a3e

* Pulled the diff-line lookup into a reusable helper so `DiffCard` now grabs and normalizes the raw line content before drafting comments; this keeps the widget payload lean and avoids scattering newline-trimming logic (`frontend/src/components/DiffCard.tsx:1-161`). Added a `stripLineEnding` utility so future callers have a single place to remove CR/LF sequences without touching other whitespace (`frontend/src/utils/string.ts:24-29`).

Tests: `pnpm run check` (fails — TypeScript can’t resolve types for `markdown-to-jsx` in `frontend/src/components/ui/markdown-renderer.tsx`; worth checking that dependency’s types or a module declaration is in place before re-running).

frontend/src/contexts/ReviewProvider.tsx

@@ -7,6 +7,7 @@ export interface ReviewComment {
   lineNumber: number;
   side: SplitSide;
   text: string;
+  codeLine?: string;
 }
 
 export interface ReviewDraft {
@@ -14,6 +15,7 @@ export interface ReviewDraft {
   side: SplitSide;
   lineNumber: number;
   text: string;
+  codeLine?: string;
 }
 
 interface ReviewContextType {
@@ -83,11 +85,23 @@ export function ReviewProvider({ children }: { children: ReactNode }) {
     const commentsNum = comments.length;
 
     const header = `## Review Comments (${commentsNum})\n\n`;
+    const formatCodeLine = (line?: string) => {
+      if (!line) return '';
+      if (line.includes('`')) {
+        return `\`\`\`\n${line}\n\`\`\``;
+      }
+      return `\`${line}\``;
+    };
+
     const commentsMd = comments
-      .map(
-        (comment) =>
-          `**${comment.filePath}** (Line ${comment.lineNumber})\n\n> ${comment.text.trim()}\n`
-      )
+      .map((comment) => {
+        const codeLine = formatCodeLine(comment.codeLine);
+        const commentBody = comment.text.trim();
+        if (codeLine) {
+          return `**${comment.filePath}** (Line ${comment.lineNumber})\n${codeLine}\n\n> ${commentBody}\n`;
+        }
+        return `**${comment.filePath}** (Line ${comment.lineNumber})\n\n> ${commentBody}\n`;
+      })
       .join('\n');
 
     return header + commentsMd;