Moving buttons into top bar during editing to conserve vertical space on smaller screens (laptops)

[reville]

Summary

• Move the desktop editing toolbar into RapidRAWs custom title bar to recover vertical space.
• Keep the back button, file information, undo/redo, original preview, and fullscreen controls aligned with the editor column as side panels resize.
• Make the five moved controls exactly 3% smaller in title-bar mode: 34.92 px circles with 19.4 px icons.
• Preserve the existing toolbar layout on Android and when native window decorations are enabled.

Verification

• npm run build passes.
• git diff --check passes.
• Verified the clean PR branch in the real macOS desktop app with a representative image open; the toolbar remains aligned over the photo editor.
• npm run typecheck still reports existing repository-wide errors outside the changed files.