fix(chat): add saved AI defaults and harden suggestions

.memory/knowledge/conventions.md

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+# Coding Conventions & Patterns
+
+## Frontend Patterns
+- **i18n**: Use `$t('key')` from `svelte-i18n`; add keys to locale files
+- **API calls**: Always use `credentials: 'include'` and `X-CSRFToken` header
+- **Svelte reactivity**: Reassign to trigger: `items[i] = updated; items = items`
+- **Styling**: DaisyUI semantic classes + Tailwind utilities; use `bg-primary`, `text-base-content` not raw colors
+- **Maps**: `svelte-maplibre` with MapLibre GL; GeoJSON data
+
+## Backend Patterns
+- **Views**: DRF `ModelViewSet` subclasses; `get_queryset()` filters by `user=self.request.user`
+- **Money**: `djmoney` MoneyField
+- **Geo**: PostGIS via `django-geojson`
+- **Chat providers**: Dynamic catalog from `GET /api/chat/providers/`; configured in `CHAT_PROVIDER_CONFIG`
+
+## Workflow Conventions
+- Do **not** attempt to fix known test/configuration issues as part of feature work
+- Use `bun` for frontend commands, `uv` for local Python tooling where applicable
+- Commit and merge completed feature branches promptly once validation passes (avoid leaving finished work unmerged)
+- See [decisions.md](../decisions.md#workflow-preference-commit--merge-when-done) for rationale