feat: admin Ingredients CRUD UI; fix "page not found" after deleting shopping list/recipe/collection (v0.85.0)

Admin > Ingredients lets admins add/edit/delete canonical ingredients and their aliases (e.g. "sel"/"sel fin"/"table salt") without touching code — previously only settable by hand in packages/db/src/seed.ts. Deleting just unlinks referencing pantry items/recipe ingredients (onDelete: set null), nothing else changes.

Fixed: deleting a shopping list, recipe, or collection from its own detail page used router.push to navigate away, leaving the deleted resource's URL in browser history — one back-button press landed on a real "Page not found" screen. All three now use router.replace so the dead URL never sits in history.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

apps/web/components/collections/delete-collection-dialog.tsx

@@ -32,7 +32,9 @@ export function DeleteCollectionDialog({ collectionId }: { collectionId: string
       const res = await fetch(`/api/v1/collections/${collectionId}?deleteRecipes=${deleteRecipes}`, { method: "DELETE" });
       if (!res.ok) throw new Error();
       toast.success(t("deleteSuccess"));
-      router.push("/collections");
+      // replace, not push — the deleted collection's URL should never sit
+      // in history, or the browser back button lands straight on a 404.
+      router.replace("/collections");
       router.refresh();
     } catch {
       toast.error(t("deleteFailed"));