test(recording): skip integration tests when screencast access fails

The three integration tests in test-video-audio-recording-process-cleanup spawn wf-recorder via cj/ffmpeg-record-video and assert on pgrep counts. They guard with executable-find and XDG_SESSION_TYPE checks, but neither catches the case where the subprocess can run wf-recorder yet lacks Wayland screencast permission. wf-recorder picks a region, retries "Failed to copy frame" 17 times, then exits with code 183 inside a second. The assertion fires against an empty pgrep.

I added test-cleanup--can-capture-frames, which calls cj/ffmpeg-record-video against a temp dir, waits 1s, and checks pgrep. If wf-recorder didn't survive, the three integration tests skip. The result is cached, so the ~2.5s cost is paid once per batch.

I added the same guard to test-integration-video-recording-multiple-start-stop-cycles. Its assertion is (= count initial-count), so it trivially passed in any environment where capture didn't work. Skipping is more honest than passing for the wrong reason.

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