fix(renderer): revert stream code block rendering

[zerob13]

Summary

• Revert the source-level stream rendering flags for Markdown code blocks.
• Restore message Markdown loading behavior to the previous part-level state.
• Remove renderer startup preloading for the new code block runtime path.

Tests

• pnpm run format
• pnpm run i18n
• pnpm run lint
• pnpm run typecheck
• pnpm exec vitest run test/renderer/components/MarkdownRenderer.test.ts test/renderer/components/message/MessageBlockContent.test.ts

Summary by CodeRabbit

• Refactor
  • Refined loading state handling to improve accuracy when displaying markdown content
  • Optimized worker initialization for mathematical expressions and diagram rendering
  • Streamlined rendering configuration across content blocks and thinking sections
  • Removed unnecessary preloading logic for cleaner initialization

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: bcf3c4ca-a5de-49c3-8b3d-bbd1c0edca02

📥 Commits

Reviewing files that changed from the base of the PR and between b55f9ba and 497ef99.

📒 Files selected for processing (4)

• src/renderer/src/components/markdown/MarkdownRenderer.vue
• src/renderer/src/components/message/MessageBlockContent.vue
• src/renderer/src/components/think-content/ThinkContent.vue
• src/renderer/src/main.ts

💤 Files with no reviewable changes (3)

• src/renderer/src/components/think-content/ThinkContent.vue
• src/renderer/src/main.ts
• src/renderer/src/components/markdown/MarkdownRenderer.vue

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📝 Walkthrough

Walkthrough

The renderer is refactored to explicitly instantiate and cache KaTeX and Mermaid web workers in main.ts, wiring them into markstream-vue via setter APIs. MarkdownRenderer drops the loading prop contract and stops forwarding loading-derived behavior to NodeRenderer. ThinkContent and MessageBlockContent adjust their NodeRenderer/loading wiring accordingly. Code-block preloading is removed.

Changes

Worker Initialization and Markdown Rendering Simplification

Layer / File(s)	Summary
Worker Setup and Registration src/renderer/src/main.ts	markstream-vue imports change from enableKatex/enableMermaid to worker setters; KaTeX and Mermaid workers are instantiated, cached on globalThis.__markdownWorkers, and registered via setKaTeXWorker/setMermaidWorker; beforeunload cleanup now calls worker terminators and clearer APIs.
Code-Block Preloading Removal src/renderer/src/main.ts	Theme/language preload arrays and async idle-time preloader functions are removed; scheduleCodeBlockRuntimePreload() call is eliminated.
Markdown Renderer Contract src/renderer/src/components/markdown/MarkdownRenderer.vue	Optional loading prop is removed from defineProps; NodeRenderer template no longer receives final, typewriter, or codeBlockStream props.
ThinkContent NodeRenderer Wiring src/renderer/src/components/think-content/ThinkContent.vue	Streaming props (final, typewriter, codeBlockStream) removed from NodeRenderer; live-node buffering controls (maxLiveNodes, liveNodeBuffer) and customId are added.
MessageBlockContent Loading State src/renderer/src/components/message/MessageBlockContent.vue	MarkdownRenderer :loading binding now uses part.loading instead of props.block.status === 'loading'.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

Possibly related PRs

• ThinkInAIXYZ/deepchat#1037: Main PR changes how KaTeX/Mermaid workers are instantiated, cached, and wired into markstream-vue at runtime, while the retrieved PR ensures renderer workers are built as ES modules so such Mermaid worker imports/bundling succeed.
• ThinkInAIXYZ/deepchat#1128: Both PRs touch the markdown renderer integration: the retrieved PR swaps imports from vue-renderer-markdown to markstream-vue, and the main PR continues that change and further adjusts NodeRenderer props and explicitly instantiates/clears Katex/Mermaid workers.
• ThinkInAIXYZ/deepchat#957: Both PRs modify ThinkContent to use NodeRenderer with customId and adjusted prop configurations.

Suggested labels

codex

Suggested reviewers

• yyhhyyyyyy

Poem

🐰 Workers now dance in the background bright,
No more loading props to dim the light,
KaTeX and Mermaid spin their wheels,
While nodes stream fast with perfect feels,
A cleaner path for markdown dreams to take flight! ✨

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately reflects the main change: reverting stream code block rendering by removing streaming props and restoring previous loading behavior across multiple components.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

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🧪 Generate unit tests (beta)

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• Commit unit tests in branch fix/issue-1601

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