fix: standardize locked-vs-hidden treatment across all 9 per-tier gated features (v0.79.0)

Rule, applied consistently everywhere via a new isFeatureAvailableAnyTier() helper: if a feature is enabled on at least one tier, it stays visible for locked-out viewers with a small "Pro" badge and opens an upgrade prompt on click; if a feature is disabled on every tier, it hides entirely, since there's no upgrade path to point at.

Covers: recipe variations, meal/drink pairings, nutrition estimation, Markdown export (5 call sites), weekly nutrition, import from URL, import from photo, and the Instacart grocery-delivery menu item. Previously inconsistent — some hid outright, one showed a lock icon overlapping its own icon.

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

apps/web/components/pantry/pantry-page-header.tsx

@@ -9,7 +9,15 @@ import { pantryToMarkdown } from "@/lib/markdown/pantry";
 
 type PantryItem = { rawName: string; quantity: string | null; unit: string | null; expiresAt: string | null };
 
-export function PantryPageHeader({ items, canExportMarkdown = true }: { items: PantryItem[]; canExportMarkdown?: boolean }) {
+export function PantryPageHeader({
+  items,
+  markdownExportAvailable = true,
+  markdownExportLocked = false,
+}: {
+  items: PantryItem[];
+  markdownExportAvailable?: boolean;
+  markdownExportLocked?: boolean;
+}) {
   const t = useTranslations("pantry");
   const tCommon = useTranslations("common");
   return (
@@ -27,7 +35,9 @@ export function PantryPageHeader({ items, canExportMarkdown = true }: { items: P
           <Printer className="h-4 w-4" />
           {tCommon("print")}
         </a>
-        {canExportMarkdown && <ExportMarkdownButton markdown={pantryToMarkdown({ items })} filename="pantry" />}
+        {markdownExportAvailable && (
+          <ExportMarkdownButton markdown={pantryToMarkdown({ items })} filename="pantry" locked={markdownExportLocked} />
+        )}
       </div>
     </div>
   );