Phase 1: mobile-first pantry redesign with In/Low/Out state

Track presence (In/Low/Out) as the primary signal instead of exact
quantities; quantity becomes an optional integer, unit optional too
(migration 0003 backfills state from quantity: 0 -> out, else in).

- Pantry rebuilt as a phone-first card list: colored state rail,
  segmented In/Low/Out switch (server-driven HTMX), greyed out-items,
  live summary counts.
- Fast add: bottom add bar with type-ahead autocomplete, location
  picker, and quick-add chips for things you've run out of.
- Per-item menu (move / set expiry / delete); expiry is now an
  optional quiet pill, never required.
- New endpoints: pantry search + set-state; dropped the old
  edit-expiry/cancel flow and its partial.
- Recipes matcher made presence-based (have-it beats have-enough);
  state added to admin. Tests cover state, add/restock, search,
  presence matching, and page rendering.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

kitchen/urls_htmx.py

@@ -10,11 +10,11 @@ urlpatterns = [
 
     # HTMX partials — pantry
     path("pantry/add/", views_htmx.pantry_add, name="app-pantry-add"),
+    path("pantry/search/", views_htmx.pantry_search, name="app-pantry-search"),
+    path("pantry/<int:item_id>/state/", views_htmx.pantry_set_state, name="app-pantry-set-state"),
     path("pantry/<int:item_id>/delete/", views_htmx.pantry_delete, name="app-pantry-delete"),
     path("pantry/<int:item_id>/move/", views_htmx.pantry_move, name="app-pantry-move"),
-    path("pantry/<int:item_id>/edit-expiry/", views_htmx.pantry_edit_expiry, name="app-pantry-edit-expiry"),
     path("pantry/<int:item_id>/save-expiry/", views_htmx.pantry_save_expiry, name="app-pantry-save-expiry"),
-    path("pantry/cancel-edit/", views_htmx.pantry_cancel_edit, name="app-pantry-cancel-edit"),
 
     # HTMX partials — shopping
     path("shopping/generate/", views_htmx.shopping_generate, name="app-shopping-generate"),