Close [BS-3391](https://linear.app/affine-design/issue/BS-3391/无法从note中拖出embed-synced-doc到白板)
### Before
can not hover on drag handle
https://github.com/user-attachments/assets/5596538e-e922-4d7f-8188-b719b234f3ee
### After
can hover on drag handle
https://github.com/user-attachments/assets/855743ec-7601-48a8-8453-cd5aa395bd06
<!-- This is an auto-generated comment: release notes by coderabbit.ai -->
## Summary by CodeRabbit
- **Bug Fixes**
- Improved detection of hovering over notes in edgeless mode, ensuring the drag handle appears correctly when hovering on the background of a selected note.
- Enhanced background style updates for edgeless notes, providing more accurate visual feedback.
- **Tests**
- Added a test to verify that the drag handle is visible when hovering over the background of a selected edgeless note.
- Updated undo/redo tests to improve accuracy of background color evaluation.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
Close [BS-3500](https://linear.app/affine-design/issue/BS-3500/剪刀没问题了，通过拖动形成的段落能不能也有同样的表现？)
<!-- This is an auto-generated comment: release notes by coderabbit.ai -->
## Summary by CodeRabbit
- **Bug Fixes**
- Improved the behavior when dragging blocks between notes, ensuring that new note blocks are inserted as siblings when appropriate, instead of always creating them at the root level.
- **Tests**
- Enhanced and enabled tests to verify correct drag-and-drop behavior across multiple notes and to ensure the relative order of note content is preserved during drag operations.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
continue #10824
### Changed
- Moved double-click-to-edit behavior from the default tool to individual model views
- Introduced `onSelected` callback interface in gfx view components to allows developers to override default selection logic
L-Sun