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

jest.config.cjs

@@ -1,15 +1,15 @@
 module.exports = {
   testEnvironment: 'jsdom',
   transform: {
-    '^.+\\.js$': 'babel-jest',
+    '^.+\\.ts$': 'babel-jest',
   },
   transformIgnorePatterns: [
     '/node_modules/(?!(@rollup)/)',
   ],
-  moduleFileExtensions: ['js', 'json'],
+  moduleFileExtensions: ['ts', 'js', 'json'],
   collectCoverageFrom: [
-    'src/**/*.js',
-    '!src/index.js',
+    'src/**/*.ts',
+    '!src/index.ts',
   ],
   coverageDirectory: 'coverage',
   coverageReporters: ['text', 'lcov'],