feat: Dashboard stats from OCM API, fix module warnings (v0.10.1)

- Rename postcss.config.js/tailwind.config.js to .cjs to fix ESM warning
- Replace Stats Summary placeholder with real OCM /api/stats data
- Handle loading, error, and offline states gracefully
- Bump version to 0.10.1

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

postcss.config.cjs

@@ -0,0 +1,6 @@
+module.exports = {
+  plugins: {
+    tailwindcss: {},
+    autoprefixer: {},
+  },
+};