### Problem
●In edgeless mode, when starting to edit, `note-block` exhibits two
types of invalid caret behavior:
(1)**Title Region Misalignment**: Clicking on the title region
incorrectly generates the caret in the first line of the note content,
rather than in the title itself.
(2)**Vanishing Caret at Line End**: When clicking in the empty space
beyond the end of a text section, the caret appears momentarily at the
line's end but disappears immediately.
●The following video demonstrates these issues:
https://github.com/user-attachments/assets/db9c2c50-709f-4d32-912c-0f01841d2024
### Solution
●**Title Click Interception**: Added a check to determine if the click
coordinates fall in the title region. If so, the caret positioning is
now handled by a dedicated logic path. Otherwise, it falls back to the
existing note-content logic as before.
●**Range Normalization**: When the generated `range.startContainer` is
not a `TextNode`, try to find a most appropriate `TextNode` and update
the `range` accordingly.
### After
●The video below shows the behavior after this fix.
https://github.com/user-attachments/assets/b2f70b64-1fc6-4049-8379-8bcf3a488a05
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **Bug Fixes**
* Clicking a page block title no longer creates unwanted paragraphs and
reliably focuses the title.
* Paragraph creation now occurs only when needed and focus is applied
only after successful creation.
* Click coordinates are clamped to container bounds to prevent misplaced
cursors or focus.
* **Improvements**
* Caret normalization: clicks place the caret at the last meaningful
text position for consistent single-cursor behavior.
* **Tests**
* Added end-to-end coverage for caret placement and focus transitions.
* New ratio-based click/double-click test utilities and a helper for
double-clicking note bodies.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
## New Features
* **Block Meta Markdown Adapter**：Inject the Block's metadata into
Markdown.
* **UI**：Apply interaction
* **Widget**
* Block-Level Widget: Displays the diffs of individual blocks within the
main content and supports accepting/rejecting individual diffs.
* Page-Level Widget: Displays global options (Accept all/Reject all).
* **Block Diff Service**：Bridge widget and diff data
* Widget subscribes to DiffMap(RenderDiff) data, refreshing the view
when the data changes.
* Widget performs operations such as Accept/Reject via methods provided
by Service.
* **Doc Edit Tool Card**:
* Display apply preview of semantic doc edit
* Support apply & accept/reject to the main content
* **Apply Playground**：A devtool for testing apply new content to
current
> CLOSE AI-274 AI-275 AI-276 AI-278
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **New Features**
* Introduced block-level markdown diffing with accept/reject controls
for insertions, deletions, and updates.
* Added block diff widgets for individual blocks and pages, featuring
navigation and bulk accept/reject actions.
* Provided a block diff playground for testing and previewing markdown
changes (development mode only).
* Added a new document editing AI tool component with interactive diff
viewing and change application.
* Supported rendering of the document editing tool within AI chat
content streams.
* **Improvements**
* Enhanced widget rendering in list, paragraph, data view, and database
blocks for improved extensibility.
* Improved widget flavour matching with hierarchical wildcard support
for more flexible UI integration.
* **Chores**
* Updated the "@toeverything/theme" dependency to version ^1.1.16 across
multiple packages.
* Added new workspace dependencies for core frontend packages to improve
module linkage.
* Extended global styles with visual highlights for deleted blocks in AI
block diff feature.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
Fix [BS-3418](https://linear.app/affine-design/issue/BS-3418/折叠的embed-doc调整宽度时，会出现一个最小高度，不需要这个)
This PR keeps the content of embed-synced-doc rendered (but clipped) when it is collapsed, to ensure accuracy in height calculation of content.
<!-- This is an auto-generated comment: release notes by coderabbit.ai -->
## Summary by CodeRabbit
- **Bug Fixes**
- Improved the display logic for embedded synced document editors, ensuring the editor and overlay are always rendered regardless of the folded state.
- **Tests**
- Updated test assertions to more accurately check whether embedded editor content is within the viewport, enhancing reliability of visibility checks.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
Close [BS-3418](https://linear.app/affine-design/issue/BS-3418/折叠的embed-doc调整宽度时，会出现一个最小高度，不需要这个)
<!-- This is an auto-generated comment: release notes by coderabbit.ai -->
## Summary by CodeRabbit
- **New Features**
- Added support for dynamically scaling the height of embedded synced document blocks, including proper handling when folding and unfolding.
- Introduced a new property to track the scaled height of folded synced document blocks.
- **Bug Fixes**
- Improved accuracy of height calculations for synced document blocks by accounting for both viewport zoom and block scale.
- **Tests**
- Enhanced end-to-end tests to consistently apply scaling before running size adjustment checks.
- Added a utility function to simulate scaling elements with keyboard shortcuts during test execution.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
Close [BS-3418](https://linear.app/affine-design/issue/BS-3418/折叠的embed-doc调整宽度时，会出现一个最小高度，不需要这个)
<!-- This is an auto-generated comment: release notes by coderabbit.ai -->
## Summary by CodeRabbit
- **New Features**
- Improved resizing and folding interactions for embedded synced documents in edgeless mode, including dynamic height calculation and enhanced drag-handle styling.
- **Bug Fixes**
- Adjusted minimum height for synced document embeds to allow more compact display.
- Ensured consistent width settings across embed cards.
- **Tests**
- Added end-to-end tests covering folding, unfolding, and resizing behaviors for edgeless synced document embeds.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
Close [BS-3404](https://linear.app/affine-design/issue/BS-3404/通过embed-doc时，插入的doc还是card-view，应该要默认embed-view)
<!-- This is an auto-generated comment: release notes by coderabbit.ai -->
## Summary by CodeRabbit
- **New Features**
- Added the ability to insert and display embedded synced documents, supporting different link types based on editor mode and user preferences.
- Introduced new UI interactions and view options for embedded synced documents in edgeless mode.
- **Bug Fixes**
- Updated UI selectors and preference keys to ensure consistent behavior and correct application of user settings.
- **Tests**
- Added and updated end-to-end tests for embedding synced documents, including header interactions and viewport fitting.
- Improved test coverage for quick search insertion and edgeless embed synced doc features.
- **Chores**
- Renamed settings and updated exports to align with new embedding functionality.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
congzhou09