fix(browser): 加固 browser_click 激活语义并修复相关验证阻塞

- 将 browser_click 调整为 mousedown/mouseup 后走 native click
- 在取消激活和中途 detached 场景下避免强制触发 native activation
- 补齐 browser_click 的回归测试与取消激活场景覆盖
- 修复 cliproxy 本地代理、Droid 环境隔离、图像分析 hook 与 proxy 集成测试的验证阻塞

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

lib/mcp/ccs-browser-server.cjs

@@ -133,7 +133,7 @@ function getTools() {
     {
       name: TOOL_CLICK,
       description:
-        'Click the first element matching a CSS selector in the selected page using synthetic element.click(). Optionally choose a page by index.',
+        'Click the first element matching a CSS selector in the selected page using a minimal mouse event chain with click fallback. Optionally choose a page by index.',
       inputSchema: {
         type: 'object',
         properties: {
@@ -516,11 +516,54 @@ async function handleClick(toolArgs) {
     if (!element) {
       throw new Error('element not found for selector: ' + selector);
     }
+    if (!element.isConnected) {
+      throw new Error('element is detached for selector: ' + selector);
+    }
     if ('disabled' in element && element.disabled) {
       throw new Error('element is disabled for selector: ' + selector);
     }
+    const style = window.getComputedStyle(element);
+    const rect = element.getBoundingClientRect();
+    if (
+      style.display === 'none' ||
+      style.visibility === 'hidden' ||
+      rect.width <= 0 ||
+      rect.height <= 0
+    ) {
+      throw new Error('element is hidden or not interactable for selector: ' + selector);
+    }
     element.scrollIntoView({ block: 'center', inline: 'center' });
+
+    const dispatchMouseEvent = (type, init) => {
+      const event = new MouseEvent(type, {
+        bubbles: true,
+        cancelable: true,
+        composed: true,
+        view: window,
+        detail: 1,
+        ...init,
+      });
+      return element.dispatchEvent(event);
+    };
+
+    try {
+      const dispatchResult = {
+        shouldActivate:
+          dispatchMouseEvent('mousedown', { button: 0, buttons: 1 }) &&
+          dispatchMouseEvent('mouseup', { button: 0, buttons: 0 }),
+      };
+      if (!dispatchResult.shouldActivate) {
+        return 'ok';
+      }
+      if (!element.isConnected) {
+        return 'ok';
+      }
+    } catch (mouseError) {
+      // Fall through to the native activation path below.
+    }
+
     element.click();
+
     return 'ok';
   })()`;