## Summary

- Show a delayed tooltip for icon-only buttons on hover and keyboard focus, using each button's label. - Use Chopin's typography, colour, radius, and shadow tokens; place tooltips above buttons with a viewport-aware fallback. - Keep tooltip copy in Title Case and at most two words while preserving contextual screen-reader labels. - Mark formatting toolbar glyphs as decorative so their accessible labels appear in tooltips. Keep existing comment previews separate from icon tooltips. - Remove the temporary tooltip jig from the PR.

## Preview


## Tooltip copy

- **Navigation:** Add Project, New Document, Open Sidebar, Close Sidebar, Document Actions, Close Document, Show Chat, Hide Chat. - **Conversation:** Send Message, Stop Planner, Withdraw Message, Add Comment, Close Comment, Post Comment, Send Reply. - **Formatting:** Block Type, Text, Heading 1, Heading 2, Heading 3, Blockquote, Bulleted List, Numbered List, Bold, Italic, Strikethrough, Underline, Inline Code, Add Link. - **Research:** Start Research, Place Research, Discard Research. - **Tables and editor:** Move Row, Move Column, Align Column, Remove Row, Remove Column, Insert Row, Insert Column, View Changes, Resize Sheet. - **Development design audit:** Add Document.

## Verification

- `bun run ci` - `bun run types` - `bun test` (1,523 passed; 2 PostgreSQL tests skipped without `TEST_DATABASE_URL`) - `bun run build` - Focused Playwright browser tests for tooltip copy, formatting glyphs, comment previews, compact navigation, and research (8 passed)