v0.22.0 — Inventory search + Location/Label grouping; Suggestions styling fix

Adds a search box (matches name, location, and labels) and a Location/Label
grouping toggle to Inventory, and fixes the unstyled Suggestions page.
(Renumbered from 0.19.0 → 0.22.0: Pantry work took 0.19–0.21 in parallel.)

Hardening from a max-effort code review of the new grid:
- Contained items resolve to their container's effective location, so search
  finds them and the flat view groups them under the right place (not "No
  location").
- Location/label groups key on id, not name, so same-named places/labels stay
  separate; synthetic bucket renamed "No labels" to avoid colliding with a real
  label; fixed duplicate React keys and two empty-state regressions.
- deleteItem now reparents a deleted container's contents into its own spot
  (its place or parent item) instead of orphaning them; the grid also treats
  any still-orphaned child as top-level so nothing silently vanishes.

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

src/lib/version.ts

@@ -1,2 +1,2 @@
 // Bump on every user-visible release. Changelog entries live in `src/lib/changelog.ts`.
-export const APP_VERSION = "0.21.1";
+export const APP_VERSION = "0.22.0";