refactor(代码重复): 抽取共享工具函数与 UI 组件，消除多处重复实现

Co-authored-by: Cursor <cursoragent@cursor.com>

src/utils/restrictedUrls.ts

@@ -0,0 +1,33 @@
+/** 浏览器内部/受限协议（含尾部冒号，用于 protocol 匹配） */
+export const RESTRICTED_PROTOCOLS = [
+  'chrome:',
+  'chrome-extension:',
+  'about:',
+  'edge:',
+  'brave:',
+  'view-source:',
+  'file:',
+  'data:',
+] as const;
+
+export function getUrlProtocol(url: string): string | null {
+  try {
+    return new URL(url).protocol;
+  } catch {
+    return null;
+  }
+}
+
+/** 用于 content script / 右键恢复等（protocol 精确匹配） */
+export function isUnsupportedPageUrl(url: string | undefined): boolean {
+  if (!url) return true;
+  const protocol = getUrlProtocol(url);
+  if (!protocol) return true;
+  return (RESTRICTED_PROTOCOLS as readonly string[]).includes(protocol);
+}
+
+/** 用于 storage cleaner tab 检测（前缀匹配，兼容无 protocol 的场景） */
+export function isRestrictedUrl(url?: string): boolean {
+  if (!url) return true;
+  return RESTRICTED_PROTOCOLS.some((p) => url.startsWith(p));
+}