feat(core): replace emoji-mart with affine icon picker (#13644)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

- New Features
  - Unified icon picker with consistent rendering across the app.
  - Picker can auto-close after selection.
  - “Remove” now clears the icon selection.

- Refactor
- Icon handling consolidated across editors, navigation, and document
titles for consistent behavior.
  - Picker now opens on the Emoji panel by default.

- Style
  - Adjusted line-height and selectors for icon picker visuals.

- Chores
  - Removed unused emoji-mart dependencies.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

packages/frontend/component/package.json

@@ -28,8 +28,6 @@
     "@atlaskit/pragmatic-drag-and-drop": "^1.4.0",
     "@atlaskit/pragmatic-drag-and-drop-hitbox": "^1.0.3",
     "@blocksuite/icons": "^2.2.17",
-    "@emoji-mart/data": "^1.2.1",
-    "@emoji-mart/react": "^1.1.1",
     "@emotion/react": "^11.14.0",
     "@emotion/styled": "^11.14.0",
     "@radix-ui/react-avatar": "^1.1.2",