Add /feed page with tabbed forms for Give Feed and Purchase Feed:
- GET /feed renders page with tabs (Give Feed default, Purchase Feed)
- POST /actions/feed-given records feed given to a location
- POST /actions/feed-purchased records feed purchases to inventory
Also adopts idiomatic FastHTML/HTMX pattern:
- Add hx-boost to base template for automatic AJAX on forms
- Refactor egg form to use action/method instead of hx_post
Spec §22 compliance:
- Integer kg only, min=1
- Warn if inventory negative (but allow)
- Toast + stay on page after submit
- Location/type stick, amount resets to default bag size
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
