umputun / revdiff / 23992443892

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Add markdown TOC navigation for single-file mode (#16)

* add plan: markdown-toc-navigation

* feat: add mdTOC component with parsing and data structures

Implement tocEntry/mdTOC structs and parseTOC function that extracts
markdown headers from diff lines, excluding headers inside fenced code
blocks. Add isFullContext and isMarkdownFile helper methods on Model.

* feat: add mdTOC cursor movement, scrolling, and active section tracking

* feat: add mdTOC rendering with indentation, cursor highlight, and active section tracking

* feat: integrate mdTOC into Model with detection, resize, and width handling

* feat: render mdTOC pane in View for markdown single-file mode

* feat: add mdTOC focus switching and key handling for markdown navigation

Enable Tab/h/l pane switching between TOC and diff in single-file markdown mode,
route j/k/pgdn/pgup/home/end to TOC cursor movement, Enter jumps to selected
header with viewport centering, and diff scrolling auto-tracks active TOC section.

* feat: add help overlay TOC section and verify edge cases for markdown navigation

* feat: verify acceptance criteria for markdown TOC navigation

* feat: update documentation for markdown TOC navigation feature

* feat: improve markdown TOC navigation with auto-jump, n/p keys, and viewport fixes

Add auto-jump on TOC cursor movement, n/p chapter navigation from diff pane,
filename as synthetic top entry, unified highlight style, top-aligned viewport
on jump, cursor sync on pane switch, and viewport tracking for active section.
Extract syncDiffToTOCCursor/syncTOCCursorToActive/topAlignViewportOnCursor
helpers to reduce duplication. Update help overlay and docs with n/p keys.

* fix: address Copilot review findings for markdown TOC navigation

- Return early on l/right in TOC pane to avoid unnecessary viewport re-jump
- Clear cursorOnAnnotation in syncDiffToTOCCursor and Enter-jump paths
- Restore single-file layout (treeWidth=0) when mdTOC is cleared in handleFileLoaded

273 of 283 new or added lines in 5 files covered. (96.47%)

3040 of 3276 relevant lines covered (92.8%)

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