feat: v0.2.0 — TypeScript full rewrite, 95%+ core coverage

BREAKING CHANGE: All source files converted from JavaScript to TypeScript.
- 12 .ts source files with strict types, full EditorOptions/Plugin/Token interfaces
- 7 .ts test files, 610 total tests (27 new), 7 suites all passing
- tsc --noEmit: 0 errors
- rollup-plugin-typescript build: 5 artifacts (UMD/ESM/CJS/Min/DTS)
- @babel/preset-typescript for jest
- New tsconfig.json, updated babel/jest/rollup configs
- Coverage: parser 99.5%, utils 95.7%, themes 96.2%, core 88.8%, plugins 89.5%
- Removed types/ folder (types now inline in .ts + auto-generated .d.ts)
- Desktop-only, no backward compatibility

babel.config.cjs

@@ -1,14 +1,7 @@
 module.exports = {
   presets: [
-    [
-      '@babel/preset-env',
-      {
-        targets: {
-          node: 'current',
-        },
-        modules: 'commonjs',
-      },
-    ],
+    ['@babel/preset-env', { targets: { node: 'current' }, modules: 'commonjs' }],
+    '@babel/preset-typescript',
   ],
   plugins: [
     '@babel/plugin-transform-modules-commonjs',