Code note: show filename and path in title bar

[kordless]

Problem

Code sticky notes opened via sticky_note_create_code don't display the filename or path anywhere in the note UI. When multiple code notes are open it's unclear which file each one shows.

Proposed solution

• Display the filename (e.g. compressor.rs) prominently in the title bar
• Show the relative or abbreviated path as a subtitle or tooltip (e.g. sidecar/src/ghost/compressor.rs)
• Truncate long paths from the left with … so the filename is always visible

Notes

The file_path is already passed to the sidecar at creation time — just needs to be surfaced in the renderer.