chore: release v0.20.2

[release-plz-mold]

🤖 New release

• mold-ai-core: 0.20.1 -> 0.20.2
• mold-ai-db: 0.20.0 -> 0.20.2
• mold-ai-catalog: 0.20.0 -> 0.20.2
• mold-ai-inference: 0.20.0 -> 0.20.2
• mold-ai-server: 0.20.0 -> 0.20.2
• mold-ai-discord: 0.20.0 -> 0.20.2
• mold-ai-tui: 0.20.0 -> 0.20.2
• mold-ai: 0.20.1 -> 0.20.2

Changelog

Fixed

• Models → Installed no longer lists models you don't have. The shelf rendered every entry the server's manifest knows about — 97 rows on a machine with two models on disk — as though each were installed. It now shows only downloaded generation models, which also fixes the landing tab: a user with nothing installed was always sent to a fake Installed shelf instead of Discover.
• The mobile navigation menu is usable again. On phones the nav sheet rendered as a 52-pixel sliver at the top of the screen, hiding every destination behind it.

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This PR was generated with release-plz.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 69.36%. Comparing base (976c220) to head (dd58391).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #474   +/-   ##
=======================================
  Coverage   69.36%   69.36%           
=======================================
  Files         278      278           
  Lines      156810   156810           
=======================================
  Hits       108768   108768           
  Misses      48042    48042           

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