feat: cooking history/gallery, unit conversion, nutrition diary, pantry scan, digest cron, nutrition-targeted meal plans

Six M-sized items from HANDOFF.md's new-features backlog:

- Profile tabs: cooking-history stats (total cooked, last-cooked, streak)
  and a "cooked it" photo gallery, both owner-only
- Display-time unit conversion (metric<->imperial) for recipe ingredients,
  respecting each user's unitPref; original value always shown alongside
  the conversion
- Nutrition daily diary: per-day macro totals computed from cooking history
  x recipe nutritionData, compared against user goals
- Pantry scan: real barcode lookup (zxing + Open Food Facts, no API key)
  with an AI-vision fallback for unbarcoded items, always confirm-before-
  insert, both paths tier/rate-limited like other AI features
- Weekly digest email: new followers/comments/ratings + trending recipes,
  sent via a new `cron` Docker stage (alpine+crond+curl) and `digest-cron`
  compose service hitting a bearer-token-protected internal route
- Meal-plan generation can now target a user's nutrition goals as a
  prompt-level nudge (recipes are AI-invented, not DB-sourced, so this
  can't be a hard macro constraint)

Caught a real deploy-breaking issue while adding the cron stage: appending
it after `runner` silently changed the Dockerfile's default build target,
and `web`'s compose config didn't pin one — fixed by pinning `target:
runner` explicitly. Verified with typecheck, lint, and three separate
`docker build --target` runs (runner/cron/migrator) plus `docker compose
config` validation.

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

apps/web/components/meal-plan/pantry-manager.tsx

@@ -1,11 +1,13 @@
 "use client";
 
 import { useState } from "react";
+import { useRouter } from "next/navigation";
 import { useTranslations } from "next-intl";
 import { Plus, Trash2, AlertTriangle } from "lucide-react";
 import { toast } from "sonner";
 import { Button } from "@/components/ui/button";
 import { Input } from "@/components/ui/input";
+import { PantryScanDialog } from "@/components/pantry/pantry-scan-dialog";
 import {
   AlertDialog,
   AlertDialogAction,
@@ -33,6 +35,7 @@ function daysUntilExpiry(dateStr: string): number {
 export function PantryManager({ initialItems }: { initialItems: PantryItem[] }) {
   const t = useTranslations("pantry");
   const tCommon = useTranslations("common");
+  const router = useRouter();
   const [items, setItems] = useState<PantryItem[]>(initialItems);
   const [name, setName] = useState("");
   const [quantity, setQuantity] = useState("");
@@ -90,6 +93,7 @@ export function PantryManager({ initialItems }: { initialItems: PantryItem[] })
         <Button onClick={add} disabled={!name.trim() || adding} size="sm">
           <Plus className="h-4 w-4" /> {t("add")}
         </Button>
+        <PantryScanDialog onAdded={() => router.refresh()} />
       </div>
 
       {/* Item list */}