fix: make closeMenu resilient to non-clickable button

Button can exist in DOM but not be actionable (e.g. on mobile where
it's off-screen). Use isVisible() check and catch click failures
with a short timeout to avoid blocking tests.

browser_tests/fixtures/ComfyPage.ts

@@ -372,8 +372,8 @@ export class ComfyPage {
 
   async closeMenu() {
     const btn = this.page.locator('button.comfy-close-menu-btn')
-    if ((await btn.count()) > 0) {
-      await btn.click()
+    if (await btn.isVisible()) {
+      await btn.click({ timeout: 2000 }).catch(() => {})
       await this.nextFrame()
     }
   }