Code note: add in-note search to top bar

[kordless]

Problem

Code sticky notes have no way to search within the file. For long files, finding a specific function or line requires manual scrolling.

Proposed solution

Add a search input to the code note top bar. Behavior:

• Text field in the top bar (or triggered by Ctrl+F / Cmd+F)
• Highlights matching text in the code view
• Navigation arrows (or Enter/Shift+Enter) to jump between matches
• Match count display (e.g. "3 / 12")
• Esc clears the search

Notes

Standard find-in-file UX — similar to browser DevTools or VS Code's in-file search.