fix(editor): refresh deferred Markdown rendering

[murongg]

Summary

• refresh parser-dependent UI when CodeMirror background parsing advances without changing Markdown
• cover code block chrome, Mermaid, raw HTML, math and footnote exclusions, block toolbars, fold controls, table merge controls, heading controls, and spellcheck
• centralize syntax-tree identity checks while preserving existing plain-text input fast paths
• add synthetic long-document regression coverage for all deferred parsing paths

Why

CodeMirror initially parses only part of a long document. Several state fields and view plugins cached results from that partial syntax tree but refreshed only after document edits or other UI events. This could leave later Mermaid and raw HTML source unrendered, clip code block chrome, show math or footnotes inside code fences, omit block controls, or retain spellcheck matches inside code.

Validation

• pnpm --filter @markra/editor test — 36 files and 440 tests passed
• pnpm --filter @markra/editor build — passed
• pnpm --filter @markra/editor typecheck:test — passed
• pnpm --filter @markra/app test -- src/components/CodeMirrorPaperSurface.test.tsx src/styles.test.ts — 2 files and 99 tests passed
• pnpm --filter @markra/app build — passed
• pnpm --filter @markra/app typecheck:test — passed
• local browser QA with a 46 KB Markdown document confirmed deferred Mermaid SVG rendering and complete rounded code block chrome

Risk

• low: refreshes are limited to syntax-tree identity changes, ordinary typing keeps the existing mapping fast paths, and spellcheck keeps its existing debounce

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Project	Deployment	Actions	Updated (UTC)
markra-web	Ready	Preview	Aug 4, 2026 2:56am