fix(macos): preserve rich descriptions and add formatting controls

[tyler-dane]

Fixes #4494

What and why

Native description edits flattened lists, reused the first matching line’s attributes, dropped nested emphasis inside links, and could crash on emoji because regex UTF-16 offsets were used as Swift character offsets. Preserve structured lists, soft breaks, blank paragraphs, unsupported HTML, and each line’s own formatting. Save bold, italic, and link changes immediately, including when no extra character is typed.

Add accessible Bold, Italic, Numbered list, and Bullet list controls with selection feedback, list continuation and renumbering, and read-only handling. Retain caret formatting across theme updates. Keyboard field jumps now scroll the requested form section into view. Normalize physical keypad Enter and character-only Enter events so Command+Enter saves from the rich-text editor.

The regression uses the real AppKit controls to format a note, save without further typing, reopen, and verify the text and Bold selection. Keep native keyboard-adapter tests in Xcode, and run 14 AppKit editor unit tests in the existing native package lane. Fixture launches skip real system notification prompts/delivery, and the title-typing fallback leaves real editors in control.

Verify

VERDICT: PASS

The reconciled head passes all strict checks: native Swift package tests, Xcode unit and interaction tests, type-check, lint, and knip. Swift contracts and desktop export checks pass. The native persistence regression exercises the actual toolbar and Command+Enter save path; Return/keypad normalization also has native adapter coverage.

The simplify pass removed duplicate inline-formatting conversion and the redundant test-only toolbar mirror/notification bridge. Named native checkbox queries exercise the actual toolbar directly. Preserve the remote button identifiers and deterministic Up Next test intent.