A test file does not get its own origin. `@vitest/browser-playwright` opens one BrowserContext per session and runs several files in it, one after another, so everything a component persists survives from file to file. `track-list` restores its sort in `connectedCallback` and `aria-tail.test.ts` activates the Title column header, so any file that mounts a track list later in that tab opens sorted by title — where `track-11` precedes `track-3`, which is #138's failure exactly. Nothing about it is specific to that pair: a probe that throws when a test starts with a non-empty `localStorage` failed 24 test-starts in one full run (11 with the two sort keys, 8 with `cover-grid-size`, 5 with `track-list-column-widths`) and cascaded into 248 failures. Which files share a tab, and in what order, changes run to run, which is the whole of why this reads as a 1-in-3 flake and passes in isolation. The clear belongs in `setup.ts` rather than in the specs that write, because the spec that reads is never the one that knows — and it is safe for the same reason the leak exists: files within a session are sequential, so it cannot wipe storage a concurrent file is using. The spec now also states the order it asserts rather than inheriting a default, and checks the row it is about to double-click carries the path it expects, so a stray sort fails by naming itself instead of as an off-by-eight file path. Closes #138