* Migrate all workflows from self-hosted Mac Mini to Depot runners
Move CI, nightly, and release workflows to depot-macos-latest. Replace
zig GhosttyKit builds with pre-built xcframework downloads. Add virtual
display for CI UI tests. Remove concurrency groups (ephemeral VMs don't
need them).
* Add per-test timeout to CI UI tests to prevent hangs on Depot
SidebarResizeUITests hangs on headless Depot runners due to mouse drag
simulation issues. Adding -maximum-test-execution-time-allowance 120
(matching test-depot.yml) ensures individual tests timeout after 2 min
instead of blocking the entire run.
* Skip SidebarResizeUITests in CI on Depot runners
Mouse drag simulation hangs on headless Depot runners even with a
virtual display. The per-test timeout doesn't prevent the hang either.
Skip this test class in CI; it still runs fine on local machines.
* Handle XCTExpectFailure in CI UI tests (exit 65 with 0 unexpected)
xcodebuild exits 65 even when all failures use XCTExpectFailure. Add
the same expected-failure handling from the unit test step so browser
focus tests (which are expected to fail on headless runners) don't
break CI.
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