Clean up webamp build config

- Remove stale browserslist field (Babel was removed)
- Remove stale files exclusion for built/types/demo
- Fix rollup typescript plugin to not emit declarations (suppresses TS5069 warning)
- Clean up tsconfig.json: remove commented-out lines, replace jest types with vitest/globals, remove stale includes/excludes

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

packages/webamp/package.json

@@ -4,14 +4,12 @@
   "description": "Winamp 2 implemented in HTML5 and JavaScript",
   "files": [
     "built",
-    "!built/types/demo",
     "!built/*.html",
     "!built/tsBuilt",
     "!built/dist"
   ],
   "types": "built/types/js/webamp.d.ts",
   "browser": "built/webamp.bundle.min.mjs",
-  "browserslist": "> 0.5%, last 2 versions, Firefox ESR, not dead",
   "exports": {
     ".": {
       "require": "./built/webamp.bundle.min.js",

packages/webamp/scripts/rollupPlugins.mjs

@@ -34,7 +34,8 @@ export function getPlugins({ minify, outputFile }) {
       compilerOptions: {
         jsx: "react-jsx",
         module: "esnext",
-        declarationDir: "dist/demo-site/declarations",
+        declaration: false,
+        declarationDir: undefined,
         outDir: "./tsBuilt",
       },
     }),

packages/webamp/tsconfig.json

@@ -1,22 +1,20 @@
 {
   "compilerOptions": {
     "moduleResolution": "node",
-    // "module": "commonjs",
     "target": "esnext",
+    "module": "esnext",
     "allowJs": true,
     "skipLibCheck": true,
     "allowSyntheticDefaultImports": true,
     "resolveJsonModule": true,
     "strict": true,
-    // "jsx": "preserve",
     "declaration": true,
     "emitDeclarationOnly": true,
     "declarationDir": "./built/types",
     "pretty": true,
-    "types": ["react/experimental", "react-dom/experimental", "jest"],
-    "jsx": "react-jsx",
-    "module": "esnext"
+    "types": ["vitest/globals", "react/experimental", "react-dom/experimental"],
+    "jsx": "react-jsx"
   },
-  "include": ["**/*.ts", "**/*.tsx", "vite.config.mts", "vite.config.mts"],
-  "exclude": ["node_modules", "demo/built", "built", "dist"]
+  "include": ["**/*.ts", "**/*.tsx"],
+  "exclude": ["node_modules", "built", "dist"]
 }