### TL;DR
Moved outline functionality into a dedicated fragment package and updated vanilla-extract CSS dependency.
### What changed?
- Created new `@blocksuite/affine-fragment-outline` package
- Relocated outline-related code from presets to the new fragment package
- Updated imports across affected files to reference the new package location
- Upgraded `@vanilla-extract/css` dependency from 1.14.0/1.16.1 to 1.17.0
- Added necessary package configuration and TypeScript setup for the new fragment
### How to test?
1. Verify outline functionality works as expected in both desktop and mobile views
2. Check that outline panel, viewer, and mobile menu components render correctly
3. Ensure outline navigation and interactions continue to work
4. Confirm no regressions in outline-related features
### Why make this change?
This change improves code organization by isolating outline functionality into a dedicated package, following the modular architecture pattern. This makes the codebase more maintainable and allows for better separation of concerns. The vanilla-extract CSS upgrade ensures consistency across packages and provides access to the latest features and fixes.
