fix: resolve all TS errors, ESLint warnings, and npm warnings bump to v0.3.12

- Pin all @milkdown/* packages to exact 7.21.1, add phantom-dep plugins as direct deps

- Fix TextSelection.create type error in useMilkdown.ts

- Fix Backspace auto-pair dead-code bug (unreachable due to PAIRS check order)

- Extract parseHeadings/Heading to outlineUtils.ts (react-refresh fix)

- Extract StatusBar item components to StatusBarItems.tsx (react-refresh fix)

- Configure npm allowScripts for electron and esbuild postinstall

- Update QUALITY_REVIEW_REPORT.json with all fixes applied

- Bump version to 0.3.12

src/renderer/components/OutlinePanel/index.ts

@@ -1,2 +1,3 @@
-export { OutlinePanel, parseHeadings } from './OutlinePanel'
-export type { Heading } from './OutlinePanel'
+export { OutlinePanel } from './OutlinePanel'
+export { parseHeadings } from './outlineUtils'
+export type { Heading } from './outlineUtils'