feat(editor): add Vim mode support

[murongg]

Summary

• Add a setting-backed Vim mode that applies to source, visual, split, and side document editors.
• Use @replit/codemirror-vim for source mode.
• Add a ProseMirror Vim-lite layer for visual editing with normal/insert modes, counts, core motions, delete/yank operators, paste, undo/redo, and a measured block caret.

Why

• Gives keyboard-heavy users a Vim-shaped editing path without replacing the Markdown editor surface.
• Keeps source mode backed by a mature CodeMirror Vim implementation while making visual mode feel closer to Vim than a few isolated shortcuts.

Validation

• pnpm --filter @markra/editor test -- vim-mode.test.ts passed
• pnpm --filter @markra/app test -- MarkdownPaper.test.tsx styles.test.ts MarkdownSourceEditor.test.tsx passed
• pnpm --filter @markra/editor build passed
• pnpm --filter @markra/editor typecheck:test passed
• pnpm --filter @markra/app typecheck:test passed
• pnpm --filter @markra/app build passed
• pnpm --filter @markra/desktop build passed

Risk

• Draft PR: visual Vim mode is intentionally Vim-lite and should get hands-on review for editing feel before it is marked ready.

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Project	Deployment	Actions	Updated (UTC)
markra-web	Ready	Preview, Comment	Jul 7, 2026 8:55am