✨ feat(content-blocks): add plugin for extracting AI message content blocks

[Innei]

Summary

• Adds a new write-only ContentBlocksPlugin (parallel to other plugins under src/plugins/) that turns the current Lexical state into a typed ContentBlock[] — text / image / file parts — matching the message-part format consumed by lobe-chat's context engine.
• Text parts are serialized through the existing MarkdownPlugin writer pipeline. Inline images inside paragraphs/headings/quotes are lifted into their own image blocks; root-level atomic nodes are always emitted as standalone blocks.
• Ships extractMediaLists(blocks) — a pure helper that derives { imageList, fileList } (with generated ids and extension-inferred fileType) from any ContentBlock[].
• Non-uploaded media defaults to a textual placeholder; emitPlaceholderForUnuploaded: false drops them silently. Adjacent text blocks are merged with \n\n.

API surface

const blocks = kernel.getDocument('content-blocks') as ContentBlock[];
const { imageList, fileList } = extractMediaLists(blocks);

// or direct
const blocks = extractContentBlocks(editor, markdownService, { ... });

Public exports are wired through src/index.ts and documented in src/plugins/content-blocks/index.md.

Test plan

• vitest run src/plugins/content-blocks — 16 / 16 passing (11 extract + 5 media-lists)
• eslint src/plugins/content-blocks src/index.ts — clean
• tsc --noEmit — no errors in the new files (only pre-existing tsconfig deprecation warnings remain)
• Manual smoke test downstream in lobe-chat after merge

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Project	Deployment	Actions	Updated (UTC)
lobe-editor	Ready	Preview, Comment	May 26, 2026 10:01am

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commit: 2c69ec8

[lobehubbot]

🎉 This PR is included in version 4.13.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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