fix(ui): stop showing add/remove favorite notifications in the footer

[tahadx]

The add/remove favorite notification is a distraction and there's no need for it. It also caused a footer layout shift I fixed in a separate PR, but that PR was closed in favor of this simpler approach.

Removes the transient status-bar notification (footer row) shown when a track is added to or removed from favorites via n.

• Does not post favAddedMark/favRemovedMark messages from the playlist or playlist-manager handlers.
• Drops the now-unused favRemovedStyle, favAddedMark, and favRemovedMark definitions.
• Removes the corresponding status-text assertions from tests.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: ASSERTIVE

Plan: Team

Run ID: 070771a5-83ae-44a2-b34e-5a679031ba46

📥 Commits

Reviewing files that changed from the base of the PR and between fc9f86d and 14d911a.

📒 Files selected for processing (3)

• ui/model/dirs_screen_test.go
• ui/model/keys.go
• ui/model/view.go

💤 Files with no reviewable changes (1)

• ui/model/dirs_screen_test.go

Included review availability: Your plan provides up to 8 included reviews per hour; 7 remain after this review.

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📝 Walkthrough

Walkthrough

Favorite toggles no longer display success status messages. Error handling, favorite-state refreshes, list updates, and behavioral test assertions remain.

Changes

Favorite toggle notification removal

Layer / File(s)	Summary
Remove favorite toggle notifications ui/model/keys.go, ui/model/view.go, ui/model/dirs_screen_test.go	Favorite toggles retain error handling and state refreshes but no longer show added or removed notifications. Unused notification markers and related test assertions were removed.

Estimated code review effort: 2 (Simple) | ~10 minutes

Merge Risk: ⚪ Minimal · up to 14d91

Favorite toggles continue to update favorites and surface errors, but no longer show added or removed status-bar messages. The change is ready to merge with no identified current-head risk.

Suggested reviewers: bjarneo, nfvelten

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 2…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: removing add/remove favorite notifications from the footer.

✨ Finishing Touches 💡 1

🛠️ Fix failing CI checks 💡

• Create stacked PR
• Commit on current branch

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