Fix CSRF 403, improve registry UI, add phonetic IDs

- Fix CSRF token handling for production: generate tokens with HMAC,
  set cookie via afterware, inject into HTMX requests via JS
- Improve registry page: filter at top with better proportions,
  compact horizontal pill layout for facets
- Add phonetic ID encoding (e.g., "tobi-kafu-meli") for animal display
  instead of truncated ULIDs
- Remove "subadult" life stage (migration converts to juvenile)
- Change "Death (natural)" outcome label to just "Death"
- Show sex/life stage in animal picker alongside species/location

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

tests/test_event_payloads.py

@@ -81,7 +81,6 @@ class TestEnums:
         """LifeStage enum has correct values."""
         assert LifeStage.HATCHLING.value == "hatchling"
         assert LifeStage.JUVENILE.value == "juvenile"
-        assert LifeStage.SUBADULT.value == "subadult"
         assert LifeStage.ADULT.value == "adult"
 
     def test_animal_status_values(self):