fix(editor): sync visual table edits to markdown

[murongg]

Summary

• handle input and composition events on the shared contenteditable table host
• resolve the active visual cell and write its serialized value back to Markdown while preserving caret and IME behavior
• add editor and app regressions for split-source synchronization and saving

Why

Browsers target editing events at the shared contenteditable table element. The previous cell-level listeners could miss real input, leaving the visual cell changed while the Markdown source stayed stale.

Validation

• pnpm --filter @markra/editor test -- src/codemirror/table.test.ts — 38 tests passed
• pnpm --filter @markra/editor build — passed
• pnpm --filter @markra/editor typecheck:test — passed
• pnpm --filter @markra/app test -- src/App.test.tsx -t "syncs visual table cell edits to source in split mode and saves them" — passed
• pnpm --filter @markra/app build — passed
• pnpm --filter @markra/app typecheck:test — passed

Risk

Low and localized to visual GFM table editing. Existing table coverage, including IME and inline content behavior, remains green.

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Project	Deployment	Actions	Updated (UTC)
markra-web	Ready	Preview, Comment	Jul 28, 2026 2:14pm