fix(editor): preserve rich HTML paste formatting

[murongg]

Summary

• prefer authored structured HTML over Markdown-looking clipboard fallback text
• normalize styled preformatted regions into fenced code blocks while preserving line breaks and language metadata
• preserve compact Codex-style file badges as inline Markdown links
• limit badge normalization to single-line preformatted div/p wrappers without semantic code content
• pass both HTML and plain text through the desktop context-menu paste path
• add regression coverage for ChatGPT/Codex-style mixed rich content and native clipboard handling

Why

Rich content copied from ChatGPT, Codex, and similar sources can include incidental Markdown-looking text alongside valid HTML. The editor previously selected the plain-text fallback or flattened the whole payload when it encountered a styled code region. Block-styled file badges inside anchors could also be parsed as empty links plus detached code blocks. Desktop right-click paste discarded HTML entirely.

Validation

• pnpm --filter @markra/editor test — 447 tests passed
• pnpm --filter @markra/app test -- context-menu-items.test.ts — 14 tests passed
• pnpm --filter @markra/app test — 1,489 tests passed
• pnpm --filter @markra/desktop test — 149 tests passed
• cargo test in apps/desktop/src-tauri — 271 tests passed
• editor, app, and desktop builds passed
• editor, app, and desktop test typechecks passed
• cargo fmt --check passed
• git diff --check passed

Risk

The change is scoped to clipboard HTML conversion and native context-menu paste. Plain text and raw Markdown fallback behavior remains covered. Styled link normalization requires a compact single-line div/p wrapper with monospace or preformatted whitespace evidence. Ordinary linked cards, semantic pre/code content, multiline links, and code blocks outside links remain on their existing conversion paths. Proprietary class-only rich text without semantic markup or inline preformatted styles remains best-effort.

Related Issues

Refs #631

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Project	Deployment	Actions	Updated (UTC)
markra-web	Ready	Preview	Aug 5, 2026 12:48am