logan
d225f922fb
Settings -> Track List Columns listed two rows both called "Track Name", one of which could not be ticked, and a screen reader heard "Show the Track Name column" twice with nothing to tell them apart. They are `titleArtist` and `trackName`, and the issue left open which way to fix it: a second label so the sort dropdown and the configurator can say different words, or drop the row because the user cannot select it. The code settles that. `titleArtist` is not in `tracklist.AllColumnIDs`, so `Config.Validate()` returns `unknown track-list column ID: "titleArtist"` -- ticking the row sends a column set the backend rejects, `config-page` swallows the rejection into a `console.error`, and the tick reverts. A second label would have named a control that cannot work. So a definition says whether it is a *choice*, and the configurator reads `CONFIGURABLE_COLUMN_IDS` rather than `Object.keys(COLUMN_DEFS)`. The new test reads Go's own list out of `backend/tracklist/config.go` rather than writing it down a third time, since a third copy is the fault one step earlier. Verified by planting: with the filter removed all four assertions fail with the defect's own numbers. Not fixed here, and filed as #231: `SetTrackListColumns` assigns before it validates, so a rejected list stays in memory and `Save()` validates the whole config -- one tick and no setting saves for the rest of the session. That is reachable from any invalid input, not from this row. Closes #197