### TL;DR
Added DOM-based renderer for connector elements in the AFFiNE editor.
### What changed?
- Created a new DOM-based renderer for connector elements that uses SVG
for rendering
- Implemented `ConnectorDomRendererExtension` to register the DOM
renderer for connector elements
- Added support for rendering connector paths, endpoints (arrows,
triangles, circles, diamonds), stroke styles, and labels
- Registered the new DOM renderer extension in the connector view setup
- Added comprehensive tests to verify DOM rendering functionality
### How to test?
1. Enable the DOM renderer flag in the editor
2. Create connector elements between shapes or with fixed positions
3. Verify that connectors render correctly with different styles:
- Try different stroke styles (solid, dashed)
- Test various endpoint styles (Arrow, Triangle, Circle, Diamond)
- Add text labels to connectors
4. Check that connectors update properly when connected elements move
5. Verify that connectors are removed when deleted
### Why make this change?
The DOM-based renderer provides an alternative to the Canvas-based
renderer, offering better accessibility and potentially improved
performance for certain use cases. This implementation allows connectors
to be rendered as SVG elements within the DOM, which can be more easily
inspected, styled with CSS, and interacted with by assistive
technologies.
<!-- This is an auto-generated comment: release notes by coderabbit.ai -->
## Summary by CodeRabbit
- **New Features**
- Improved rendering for diamond and triangle shapes using SVG, resulting in more accurate stroke and fill display.
- **Bug Fixes**
- Ensured background and border styles do not interfere with SVG-based shapes.
- **Tests**
- Added tests to verify correct DOM rendering for diamond and triangle shapes.
- **Refactor**
- Streamlined and clarified the rendering logic for polygonal shapes, separating SVG and CSS rendering paths.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
Comparison:
<!-- This is an auto-generated comment: release notes by coderabbit.ai -->
## Summary by CodeRabbit
- **New Features**
- Border radius and border thickness of shapes now scale dynamically with zoom level for improved visual consistency.
- **Tests**
- Added a test to ensure percentage-based border radius values are correctly rendered in the DOM.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
Yifeng Wang
