Closes: [BS-3551](https://linear.app/affine-design/issue/BS-3551/citation埋点)
<!-- This is an auto-generated comment: release notes by coderabbit.ai -->
## Summary by CodeRabbit
- **New Features**
- Enhanced citation tracking across attachments, bookmarks, embedded documents, paragraphs, footnotes, rename modals, and toolbars for actions like editing, deleting, expanding, and hovering on citations.
- Introduced a centralized citation service to unify citation detection and telemetry event management.
- **Chores**
- Updated service exports and telemetry modules to include the new citation service and citation-related event types.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
Related to: [BS-3559](https://linear.app/affine-design/issue/BS-3559/ui-%E5%9B%BE%E7%89%87-loading-%E5%8F%98%E9%87%8F%E6%9B%B4%E6%96%B0)
<!-- This is an auto-generated comment: release notes by coderabbit.ai -->
## Summary by CodeRabbit
- **Style**
- Improved the appearance of image loading indicators by updating background and ring colors for a more consistent visual experience.
- **New Features**
- Added customization options for the loading icon's ring color.
- **Chores**
- Updated the "@toeverything/theme" dependency to version ^1.1.15 across multiple packages for improved consistency and compatibility.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
Closes: [BS-3555](https://linear.app/affine-design/issue/BS-3555/ui-attachment-loading-变量更新)
Closes: [BS-3559](https://linear.app/affine-design/issue/BS-3559/ui-图片-loading-变量更新)
### Dark
<img width="625" alt="Screenshot 2025-05-26 at 20 32 36" src="https://github.com/user-attachments/assets/93501e3d-8fc6-45f9-84a0-ac147e5c5f9f" />
### Light
<img width="623" alt="Screenshot 2025-05-26 at 20 32 25" src="https://github.com/user-attachments/assets/7d5bc128-6667-45b5-982d-dab3a22706a7" />
<!-- This is an auto-generated comment: release notes by coderabbit.ai -->
## Summary by CodeRabbit
- **New Features**
- Loading icons are now invoked as functions, allowing for more flexible and customizable rendering with parameters like size and progress.
- **Refactor**
- Replaced theme-dependent and static loading icon references with a unified `LoadingIcon()` component across multiple components and blocks.
- Removed legacy icon variants and simplified icon import statements, centralizing icon rendering logic.
- **Style**
- Updated styles for loading and reload buttons to use theme-aware CSS variables.
- Enlarged and repositioned loading indicators in image blocks for better visibility.
- **Bug Fixes**
- Achieved consistent loading icon rendering across various blocks and components by standardizing icon invocation.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
Closes: [BS-3525](https://linear.app/affine-design/issue/BS-3525/markdown-adapter-紧跟着链接的-footnote-reference-会被识别成链接的一部分)
<!-- This is an auto-generated comment: release notes by coderabbit.ai -->
## Summary by CodeRabbit
- **New Features**
- Improved handling of footnote references that immediately follow URLs in markdown, ensuring correct spacing and parsing.
- **Bug Fixes**
- Footnote references after URLs are now parsed correctly, preventing formatting issues.
- **Tests**
- Added comprehensive test suites to verify footnote reference preprocessing and markdown conversion.
- **Chores**
- Introduced Vitest as a development dependency and added a dedicated test configuration for the footnote module.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
<!-- This is an auto-generated comment: release notes by coderabbit.ai -->
## Summary by CodeRabbit
- **Chores**
- Removed multiple internal export entries related to effects modules across various packages.
- Updated dependencies and configuration references to improve internal consistency. No visible changes for end-users.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
<!-- This is an auto-generated comment: release notes by coderabbit.ai -->
## Summary by CodeRabbit
- **Refactor**
- Streamlined and consolidated block and inline extension exports by removing multiple block-spec and inline extension arrays from public APIs.
- Reduced exported constants, types, and utility functions related to various block and embed features.
- Simplified the codebase by removing deprecated type guards, adapter extensions, and redundant extension groupings.
- **Chores**
- Cleaned up internal APIs by deleting unused exports, imports, and outdated code, enhancing maintainability.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
Closes: [BS-2578](https://linear.app/affine-design/issue/BS-2578/优化-footnote-预览的逻辑：支持缓存结果，避免重复-loading)
<!-- This is an auto-generated comment: release notes by coderabbit.ai -->
## Summary by CodeRabbit
- **New Features**
- Introduced a link preview caching mechanism, enabling faster and more efficient reuse of link preview data across the app.
- Added a feature flag for enabling or disabling link preview cache, configurable through workspace experimental settings.
- Enhanced localization with new entries describing the link preview cache feature.
- **Improvements**
- Updated link preview service architecture for better extensibility and maintainability.
- Improved integration of feature flags throughout chat and rendering components.
- **Bug Fixes**
- Fixed tooltip formatting for footnote URLs.
- **Chores**
- Updated dependencies and localization completeness tracking.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
<!-- This is an auto-generated comment: release notes by coderabbit.ai -->
## Summary by CodeRabbit
- **New Features**
- Improved how bookmark and footnote icons are displayed by routing image URLs through an image proxy service for enhanced reliability and consistency.
- **Refactor**
- Adjusted the timing of service configuration for link previews and image proxies to occur after document initialization, ensuring more robust setup during content rendering.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
<!-- This is an auto-generated comment: release notes by coderabbit.ai -->
## Summary by CodeRabbit
- **New Features**
- Introduced a unified loading spinner icon that adapts to light or dark themes automatically.
- **Refactor**
- Streamlined loading icon usage across the app by replacing multiple theme-based icons with a single helper function for consistent and simplified icon management.
- **Chores**
- Removed an unused dependency to improve package management.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
Close [BS-3268](https://linear.app/affine-design/issue/BS-3268/edgeless-下，-dark-mode-embed的配色应该更加清晰)
Close [BS-3067](https://linear.app/affine-design/issue/BS-3067/在embed上，添加split-view等相关的操作入口，基本接近page-block（见设计稿）)
<!-- This is an auto-generated comment: release notes by coderabbit.ai -->
## Summary by CodeRabbit
- **New Features**
- Introduced an interactive header for embedded synced documents with fold/unfold toggle, document opening, and multiple view options.
- Added info and copy link buttons for embedded synced documents and notes to improve document management and sharing.
- **Enhancements**
- Updated styles for embedded synced document blocks and headers for better visual consistency.
- Added new localization entries for header actions: "Fold", "Unfold", and "Open".
- Disabled redundant open document actions in toolbars, centralizing controls in the header.
- **Refactor**
- Unified header button components for notes and embedded synced documents into reusable components.
- Simplified header components by delegating button behaviors to shared components.
- **Bug Fixes**
- Fixed conditional rendering of editor content in embedded synced documents when folded.
- **Chores**
- Upgraded theme dependency version from "^1.1.12" to "^1.1.14" across multiple packages.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
Closes: [BS-3122](https://linear.app/affine-design/issue/BS-3122/footnote-definition-adapter-适配)
Closes: [BS-3123](https://linear.app/affine-design/issue/BS-3123/几个-block-card-view-适配-footnote-态)
<!-- This is an auto-generated comment: release notes by coderabbit.ai -->
## Summary by CodeRabbit
- **New Features**
- Introduced a new citation card component and web element for displaying citations.
- Added support for citation-style rendering in attachment, bookmark, and linked document blocks.
- Enabled citation parsing from footnote definitions in markdown for attachments, bookmarks, and linked docs.
- Added a feature flag to enable or disable citation features.
- Provided new toolbar logic to disable downloads for citation-style attachments.
- **Improvements**
- Updated block models and properties to support citation identifiers.
- Added localization and settings for the citation experimental feature.
- Enhanced markdown adapters to recognize and process citation footnotes.
- Included new constants and styles for citation card display.
- **Bug Fixes**
- Ensured readonly state is respected in block interactions and rendering for citation blocks.
- **Documentation**
- Added exports and effects for new citation components and features.
- **Tests**
- Updated snapshots to include citation-related properties in block data.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
Closes: [BS-3113](https://linear.app/affine-design/issue/BS-3113/footnote-popup-ui-更新)
<!-- This is an auto-generated comment: release notes by coderabbit.ai -->
## Summary by CodeRabbit
- **New Features**
- Added a description display below the chip in the footnote popup when available.
- **Style**
- Improved the appearance of footnote popups with enhanced border radius, padding, and layout.
- Updated font styling for labels and descriptions.
- Simplified chip styling by reducing height and removing unnecessary CSS properties.
- **Bug Fixes**
- Tooltip content for URL references now displays both the link preview title and URL when available.
- **Refactor**
- Simplified click handling by attaching it to the container instead of individual elements.
- Removed unused click event properties from the footnote popup chip.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
Closes: [BS-3272](https://linear.app/affine-design/issue/BS-3272/footnote-适配-exa-api-返回结果)
## What's Changed
Add link preview data support (favicon, title, description) for URL references in footnotes:
- Store and display URL preview data in footnotes
- Add encoding/decoding support for favicon URLs
- Optimize link preview by using existing preview data when available
