Allow rating tracks from History tab

[paulpv]

Summary

Give listeners the ability to set and edit a star rating while reviewing past sessions in the History tab. This complements the earlier track-rating work but keeps the context focused on the playback log.

Proposed work

• Extend each History row with a lightweight rating control (e.g., 0–5 stars) that only appears when setRating support is enabled.
• Persist rating updates to the same IndexedDB store used for track metadata so ratings stay in sync across list and history views.
• Reflect existing ratings when rendering history entries, including skips/completions.
• Ensure keyboard accessibility for assigning/removing ratings from History.
• Add README manual testing notes covering rating edits via History, reloading, and handling deleted tracks.

Notes

Issue #1 (closed) covered general track ratings; this task narrows in on the History UX where we now have rich session data.