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>

tests/integration/image-analyzer-hook.test.ts

@@ -53,6 +53,11 @@ function invokeHook(env: Record<string, string> = {}): Promise<HookResult> {
       env: {
         ...process.env,
         CCS_IMAGE_ANALYSIS_SKIP: '', // clear any inherited skip flag
+        CCS_IMAGE_ANALYSIS_SKIP_HOOK: '', // clear any inherited MCP-ready bypass
+        CCS_IMAGE_ANALYSIS_MODEL: '', // let each test control explicit model fallback behavior
+        CCS_IMAGE_ANALYSIS_BACKEND_ID: '',
+        CCS_IMAGE_ANALYSIS_RUNTIME_PATH: '',
+        CCS_IMAGE_ANALYSIS_RUNTIME_BASE_URL: '',
         CCS_CLIPROXY_API_KEY: CLIPROXY_API_KEY,
         CCS_CLIPROXY_PORT: String(mockPort),
         CCS_IMAGE_ANALYSIS_ENABLED: '1',