Keep agent browser tabs connected across workspace switches (#2156)

* fix(desktop): keep browser tabs connected across workspaces

Electron can replace a guest WebContents when a retained browser tab is reparented. Re-register each attachment and keep background actionability checks running so agent browser tools retain the tab through workspace eviction.\n\nCover the full app, daemon, Electron, and MCP path in the existing desktop CI job.

* fix(desktop): launch Electron E2E reliably on Linux

CI Electron must receive --no-sandbox before the app starts because the hosted runner cannot use Electron's bundled SUID sandbox helper. Forward explicit dev-runner arguments and fail readiness waits as soon as a child exits.

* fix(desktop): preserve active browser on repeated registration

* fix(desktop): keep browser keyboard attachment idempotent

* fix(desktop): wait for E2E bridge readiness

* fix(desktop): close E2E logs after output drains

packages/desktop/src/features/browser-automation/actionability.ts

@@ -100,8 +100,11 @@ function buildActionabilityScript(input: {
     const deadline = performance.now() + ${JSON.stringify(input.timeoutMs)};
     const requiresEditable = ${JSON.stringify(input.editable)};
 
-    const nextFrame = () => new Promise((resolve) => requestAnimationFrame(resolve));
     const sleep = (ms) => new Promise((resolve) => setTimeout(resolve, ms));
+    // Electron can suspend requestAnimationFrame while a guest is parked after
+    // workspace LRU eviction even though the guest remains CDP-controllable.
+    // Timed layout samples keep background browser automation live.
+    const waitForLayout = () => sleep(16);
     const nearlyEqual = (a, b) => Math.abs(a - b) < 0.25;
     const sameRect = (a, b) =>
       nearlyEqual(a.x, b.x) &&
@@ -174,9 +177,9 @@ function buildActionabilityScript(input: {
       }
 
       element.scrollIntoView?.({ block: 'center', inline: 'center' });
-      await nextFrame();
+      await waitForLayout();
       const firstRect = element.getBoundingClientRect();
-      await nextFrame();
+      await waitForLayout();
       const secondRect = element.getBoundingClientRect();
       if (!sameRect(firstRect, secondRect)) {
         detail = 'moving';