test(app): quarantine FolderSwitch tab e2e test

[shuv1337]

Quarantines one app e2e test with test.fixme(): packages/app/e2e/regression/tabs.spec.ts, "each session tab shows its own file tab after a switch to a session in another folder".

The test fails because a span[data-slot=project] showing "FolderSwitch" covers the Open file button, so the click times out (example: https://github.com/shuv1337/shuvcode/actions/runs/37427591275/job/112150819534). That failure blocks unrelated changes.

The test body and its assertions are unchanged. Tracking issue for the UI fix and re-enable: #438

Test infrastructure only. No product or UI changes.

[shuv1337]

🔍 Automated Cursor review is underway. Please hold off on merging until the review comment lands here (usually 10–20 minutes).

[cursor]

Review complete:

Medium — packages/app/e2e/regression/tabs.spec.ts:487-489 (underlying UI: packages/app/src/shell/titlebar/tab-popover.css:24, packages/app/src/shell/titlebar/tab-popover.tsx:74-87). The test.fixme() is inside this one test, the assertions are unchanged, and issue #438 is linked, but the failure it silences is a real click trap. In the cited run (job 112150819534) the first Open file click succeeds; the 60s timeout is the next one, open("notes.txt") after the switch to the other-folder session, and it failed on all 3 attempts. The trace snapshot at that click shows the session-tab hover card still open, the switched tab focused, and [data-component=session-tab-popover] positioned at translate3d(553px, 43px, 0px) with inline pointer-events: auto. That inline style overrides the stylesheet's pointer-events: none, so the span[data-slot=project] reading "FolderSwitch" receives the click meant for the review panel's Open file button. At the test's 1440×900 viewport with the review panel open, activating a session tab leaves that preview up over the button. Users in the same layout hit the same overlap. Re-enable work on #438 needs the preview to be click-through, or to close once the pointer leaves the tab.

Low — packages/app/e2e/regression/tabs.spec.ts:489. test.fixme() is called with no description, so the Playwright report will not carry the issue URL; the link exists only in the comment above the call. Passing the #438 URL as the fixme description would keep the quarantine visible in CI output. This is the only test.fixme in the repo; the call itself is the right Playwright API and applies only to this test (the Windows titlebar test below it still runs). The PR text does not auto-close #438.

[shuv1337]

Responses to the Cursor review:

Low (fixme has no description): Fixed in 3da9fdf. The fixme is now test.fixme(true, "FolderSwitch project label covers the Open file button: https://github.com/shuv1337/shuvcode/issues/438"), so the issue URL shows up in the Playwright report.

Medium (real click trap): This PR only quarantines the test; the UI fix is out of scope. I added the root cause to #438: the session-tab hover popover stays open with inline pointer-events: auto after the folder switch, and the failing click is the second open("notes.txt"). The PR text does not close #438 on purpose; the issue stays open until the UI fix lands.