[28/33] fix(music): classify complete discographies and support artist slugs

[mmattbtw]

Classify complete discographies and support artist slugs. This groups the existing commits by chronology and the area they change.

Part 28 of 33 replacing #113. Review this PR against feature/obbpr-27-notification-context. Merge the stack from oldest to newest. The original obbpr branch remains unchanged at d3cf209d6ab5ae6d3b2b7ac353b3dbb7d54fe133 for rollback.

Commits in this group:

• 8a19ad8 fix(music): classify complete artist discographies
• 2c3455a fix(amethyst): support slug-only artist links

Validation: checked the branch ancestry and confirmed that the final stack tree exactly matches obbpr. This split preserves existing commits and merge history; no source edits or new build/test runs. Intermediate snapshots have not been independently validated, so these PRs start as drafts. Historical main merges are preserved.

Stack navigation:

• Previous: [27/33] feat(amethyst): group notifications and show post context #221
• Next: [29/33] feat(amethyst): add cohesive dark mode #223
• Full stack index: obbpr #113

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