Add Markdown/Word (Pandoc) support and rename braille2latex to braille-bridge

[jmankoff]

Summary

• Add a Markdown pane alongside the existing braille/LaTeX panes: live bidirectional sync (applyMarkdownEdit), Markdown/Word upload+download via @brailletools/braille-bridge's new Pandoc integration, and sync-issue surfacing for unsupported Markdown constructs.
• Rename braille2latex → braille-bridge throughout (dependency, imports, CI clone URLs/version-pin file, README, stale make4all org link) to match the upstream repo rename.
• Bundled two pre-existing, unrelated naming bugs found while researching the rename: this package's own package.json name was literally "braille2latex", and the README title was # Braille2Latex.

Depends on

brailletools/braille-bridge#23 — this branch's CI clones a pinned release tag of braille-bridge (braille-bridge.version, currently v0.2.1), not that PR's branch directly. That PR needs to merge and get tagged as a new release, with braille-bridge.version bumped here, before CI will exercise the new Markdown/Pandoc code paths end-to-end. Locally this was verified against the file: dependency pointing at that branch (pnpm run test:sync/test:unit, both green).

Test plan

• pnpm run test:sync (4/4) and test:unit (10/10) against the updated braille-bridge dependency
• pnpm run test:a11y (axe-core, no new violations)
• Bump braille-bridge.version once Add Pandoc/Markdown support, rename to braille-bridge, fix bold/italic parsing bugs braille-bridge#23 is merged and tagged, then re-run full CI

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