When a download fails in the Download Missing Tracks modal, hovering over the "Failed" status now shows a tooltip explaining why. The backend already tracked error_message on tasks internally but never sent it to the frontend. This surfaces those reasons and enriches them with detailed context — search diagnostics break down what happened per query (no results, filtered out, search error), retry failures include source counts and likely cause, and timeout/stuck messages name the state and duration. The tooltip uses a fixed-position popup to avoid clipping by the modal's scroll container, with scroll and visibility-aware dismissal.
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