chore: fix pghistory migration deps and improve htmx utilities

- Update pghistory dependency from 0007 to 0006 in account migrations
- Add docstrings and remove unused imports in htmx_forms.py
- Add DJANGO_SETTINGS_MODULE bash commands to Claude settings
- Add state transition definitions for ride statuses

.claude/settings.local.json

@@ -4,9 +4,11 @@
       "Bash(python manage.py check:*)",
       "Bash(uv run:*)",
       "Bash(find:*)",
-      "Bash(python:*)"
+      "Bash(python:*)",
+      "Bash(DJANGO_SETTINGS_MODULE=config.django.local python:*)",
+      "Bash(DJANGO_SETTINGS_MODULE=config.django.local uv run python:*)"
     ],
     "deny": [],
     "ask": []
   }
-}
+}