fix(editor): make heading marker hiding opt-in

[murongg]

Summary

• replace the broad Markdown marker reveal preference with an opt-in heading marker hiding preference
• keep the setting disabled by default and limit its behavior to heading markers only
• preserve the existing full reveal behavior for inline formatting markers
• migrate the beta.6/beta.7 reveal preference by inverting its stored value
• update the setting copy across all supported locales to describe the Typora-like behavior

Why

The setting added in #582 affected both headings and inline formatting, while #580 only targets the visual shift caused by heading markers. Expressing the setting as automatic hiding also makes the switch direction match the behavior users enable.

Validation

• pnpm --filter @markra/editor test — 351 tests passed
• pnpm --filter @markra/app test -- src/components/CodeMirrorPaperSurface.test.tsx src/components/settings/EditorSettings.test.tsx src/lib/settings/editor-preferences.test.ts src/lib/settings/settings-events.test.ts src/hooks/useEditorPreferences.test.tsx — 100 tests passed
• pnpm --filter @markra/shared test -- src/i18n/index.test.ts — 5 tests passed
• pnpm typecheck:test — passed
• pnpm build — passed, including desktop vendor chunk verification

Risk

• existing beta.6/beta.7 preferences are migrated with inverted boolean semantics so the effective user choice is preserved
• inline formatting and link marker reveal behavior remain unchanged

Refs #580
Follow-up to #582

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Project	Deployment	Actions	Updated (UTC)
markra-web	Ready	Preview, Comment	Jul 27, 2026 4:57am