v2.5.8 — MDX Plugin Hotfix & Source Editor Standardization

What's Changed

🐛 Bug Fix: MDX Plugin Invalid Hook Call

• Root cause: registry.ts called MdxEditorSlot() as a regular function to detect null mock components, triggering React hooks outside render context → Invalid hook call error.
• Fix: Replaced isNullMock invocation with simple !component falsy check.

🔧 Vite Config Cleanup

• Removed ssr.noExternal (crashed CJS React in ESM SSR context)
• Removed resolve.alias for react/react-dom (caused dual React instances)
• Added @mdxeditor/editor > react to optimizeDeps.include for proper deduplication

✨ UX Improvements

• Renamed Native Editor → Source Editor across all UI surfaces
• Renamed Markdown Editor tab → Source for consistent naming
• Simplified MdxSlot.tsx: replaced custom CustomImageButton with native InsertImage
• 2-Tab mode (no plugin): Source + Preview
• 3-Tab mode (with plugin): Edit + Source + Preview

📦 Also Includes (from v2.5.7)

• Zero-Plugin Native Fallback (NativePlainEditor)
• Safe Props Protection (React Error #306 fix)
• PostList sort key deduplication
• Monorepo version sync scripts

Verification

• ✅ Vitest: 14/14 files, 113/113 tests passed
• ✅ TypeScript: 0 errors
• ✅ Version sync: 4/4 targets aligned
• ✅ Spec updated to v1.4.0

Full Changelog: v2.5.6...v2.5.8