### TL;DR
Refactored the BlockSuite turbo renderer to use a hierarchical tree structure for layouts instead of a flat list, improving rendering accuracy and performance.
### What changed?
- Redesigned the layout system to use a tree structure (`ViewportLayoutTree`) that better represents the document hierarchy
- Added `blockId` to all layout objects for better tracking and debugging
- Updated the layout query mechanism to work with models directly instead of components
- Enhanced error handling with more descriptive warnings and error messages
- Improved the painting process to traverse the layout tree recursively
- Fixed viewport coordinate calculations for more accurate rendering
- Updated the worker communication to support the new tree-based layout structure
### Why make this change?
The previous flat layout structure didn't properly represent the hierarchical nature of documents, leading to rendering issues with nested blocks. This tree-based approach:
1. Better represents the actual document structure
2. Improves rendering accuracy for nested elements
3. Makes debugging easier with more consistent block identification
4. Provides a more robust foundation for future rendering optimizations
5. Reduces the likelihood of rendering artifacts when scrolling or zooming
Close [BS-3079](https://linear.app/affine-design/issue/BS-3079).
- Separate the create session logic from the `createMessage function`.
- Ensure the session is created before executing any chat or actions.
- Convert the `AIActions` into asynchronous functions.
- Transfer the update prompt name logic to the chat action.
- Introduce a networkSearch field in `AITextActionOptions`.
- Eliminate the redundant `LAST_ROOT_SESSION_ID`.
To close [BS-2870](https://linear.app/affine-design/issue/BS-2870/支持识别-和-[-包裹内容为公式)
## Add Markdown Preprocessor Extension and Enhanced LaTeX Support
### Markdown Preprocessor Extension
This PR introduces a new preprocessor extension for Markdown adapters that allows preprocessing of content before conversion:
Adds a new PreprocessorManager for handling text transformations
Introduces extensible preprocessor interface that supports different processing levels (block/slice/doc)
Integrates preprocessor extension into the existing Markdown adapter workflow
### LaTeX Support Enhancement
Extends LaTeX support to handle both traditional and alternative syntax:
Adds support for backslash LaTeX syntax:
Block math: ```\[...\] ``` alongside existing ```$$...$$```
Inline math: ```\(...\) ``` alongside existing ```$...$```
Implements LaTeX preprocessor to standardize syntax before conversion
Updates tests to cover both syntax variants
fix AF-2460, AF-2463
When recording is started, we start polling the pending raw buffers that are waiting for encoding. The buffers are determined by the cursor of the original raw buffer file. When recording is stopped, we will flush the pending buffers and wrap the encoded chunks into WebM.
```mermaid
sequenceDiagram
participant App as App/UI
participant RecordingFeature as Recording Feature
participant StateMachine as State Machine
participant FileSystem as File System
participant StreamEncoder as Stream Encoder
participant OpusEncoder as Opus Encoder
participant WebM as WebM Muxer
Note over App,WebM: Recording Start Flow
App->>RecordingFeature: startRecording()
RecordingFeature->>StateMachine: dispatch(START_RECORDING)
StateMachine-->>RecordingFeature: status: 'recording'
RecordingFeature->>StreamEncoder: createStreamEncoder(id, {sampleRate, channels})
Note over App,WebM: Streaming Flow
loop Audio Data Streaming
RecordingFeature->>FileSystem: Write raw audio chunks to .raw file
StreamEncoder->>FileSystem: Poll raw audio data
FileSystem-->>StreamEncoder: Raw audio chunks
StreamEncoder->>OpusEncoder: Encode chunks
OpusEncoder-->>StreamEncoder: Encoded Opus frames
end
Note over App,WebM: Recording Stop Flow
App->>RecordingFeature: stopRecording()
RecordingFeature->>StateMachine: dispatch(STOP_RECORDING)
StateMachine-->>RecordingFeature: status: 'stopped'
StreamEncoder->>OpusEncoder: flush()
StreamEncoder->>WebM: muxToWebM(encodedChunks)
WebM-->>RecordingFeature: WebM buffer
RecordingFeature->>FileSystem: Save as .opus file
RecordingFeature->>StateMachine: dispatch(SAVE_RECORDING)
```
