Rework homepage

[RadValentin]

TODO

API

• Implement endpoints
  • Today's picks - random selection with current day as seed of tracks with submissions > 100, cached for 24h
  • All time favorites - top tracks endpoint, previously implemented
    • Create a separate "top tracks" endpoint that returns 1 track per album/artist and applies some randomness seeded by the current date to the results
  • "On this day" list, tracks released "today"
    • Return only 1 track per album/artist, to keep things interesting.

UI

• Implement basic routing to separate home page from search page
• Fetch from new API endpoints and a group of tracks for each on the home page
• Split TrackItem into card layout (home, search) and pill layout (player)
• Card panels with horizontal scroll (back/forward buttons)

[codecov]

Codecov Report

❌ Patch coverage is 92.12598% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.71%. Comparing base (d258ae0) to head (9e28ae1).

Files with missing lines	Patch %	Lines
backend/recommend_api/api/track.py	83.33%	6 Missing and 3 partials ⚠️
backend/recommend_api/router.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #34      +/-   ##
==========================================
+ Coverage   90.59%   90.71%   +0.11%     
==========================================
  Files          37       37              
  Lines        1850     1970     +120     
  Branches      129      139      +10     
==========================================
+ Hits         1676     1787     +111     
- Misses        135      141       +6     
- Partials       39       42       +3     

Files with missing lines	Coverage Δ
backend/recommend_api/tests/api/test_track_api.py	100.00% <100.00%> (ø)
backend/recommend_api/router.py	39.28% <0.00%> (ø)
backend/recommend_api/api/track.py	84.40% <83.33%> (-1.81%)	⬇️

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