perf+ui: gzip (api/static precompressed), immutable attachment cache, responsive dialogs/header, safe-area + dynamic theme-color, mobile tuning

app/src/main.tsx

@@ -17,6 +17,14 @@ if (saved === 'dark' || (!saved && window.matchMedia('(prefers-color-scheme: dar
   document.documentElement.classList.add('dark');
 }
 
+// 状态栏/标题栏颜色跟随主题（亮暗切换实时同步）
+function syncThemeColor() {
+  const bg = getComputedStyle(document.documentElement).getPropertyValue('--bg').trim();
+  if (bg) document.querySelector('meta[name="theme-color"]')?.setAttribute('content', bg);
+}
+syncThemeColor();
+window.addEventListener('fp-theme-change', syncThemeColor);
+
 // PWA：仅生产构建且非桌面壳时注册（桌面端走 Tauri，无需 SW）
 if ('serviceWorker' in navigator && import.meta.env.PROD && !('__TAURI_INTERNALS__' in window)) {
   window.addEventListener('load', () => {