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/recipe/delete-recipe-button.tsx

@@ -35,7 +35,9 @@ export function DeleteRecipeButton({ recipeId }: { recipeId: string }) {
         throw new Error(data.error ?? "Delete failed");
       }
       toast.success(t("deleted"));
-      router.push("/recipes");
+      // replace, not push — the deleted recipe's URL should never sit in
+      // history, or the browser back button lands straight on a 404.
+      router.replace("/recipes");
     } catch (err) {
       toast.error(err instanceof Error ? err.message : t("deleteFailed"));
       setDeleting(false);