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/meal-planner.tsx

@@ -117,10 +117,12 @@ export function MealPlanner({
   weekStart,
   initialEntries,
   userRecipes,
+  hasNutritionGoals = false,
 }: {
   weekStart: string;
   initialEntries: Entry[];
   userRecipes: UserRecipe[];
+  hasNutritionGoals?: boolean;
 }) {
   const [entries, setEntries] = useState<Entry[]>(initialEntries);
   const [adding, setAdding] = useState<{ day: Day; mealType: MealType } | null>(null);
@@ -132,6 +134,7 @@ export function MealPlanner({
   const [usePantry, setUsePantry] = useState(true);
   const [pantryMode, setPantryMode] = useState(false);
   const [aiDifficulty, setAiDifficulty] = useState<"" | "easy" | "medium" | "hard">("");
+  const [targetNutritionGoals, setTargetNutritionGoals] = useState(false);
   const t = useTranslations("mealPlan");
   const tRecipe = useTranslations("recipe");
 
@@ -158,6 +161,7 @@ export function MealPlanner({
           usePantry,
           pantryMode,
           difficulty: aiDifficulty || undefined,
+          targetNutritionGoals: hasNutritionGoals && targetNutritionGoals,
         }),
       });
       if (!res.ok) {
@@ -390,6 +394,21 @@ export function MealPlanner({
                   </label>
                 )}
               </div>
+              {hasNutritionGoals && (
+                <label className="flex items-start gap-2 cursor-pointer select-none">
+                  <input
+                    type="checkbox"
+                    className="h-4 w-4 mt-0.5"
+                    checked={targetNutritionGoals}
+                    onChange={(e) => setTargetNutritionGoals(e.target.checked)}
+                    disabled={aiGenerating}
+                  />
+                  <span className="space-y-0.5">
+                    <span className="text-sm font-medium block">{t("targetNutritionGoals")}</span>
+                    <span className="text-sm text-muted-foreground block">{t("targetNutritionGoalsDescription")}</span>
+                  </span>
+                </label>
+              )}
               <FakeProgressBar active={aiGenerating} durationMs={20000} label={aiPhase} />
               <div className="flex gap-2 justify-end">
                 <Button variant="ghost" onClick={() => setShowAiModal(false)} disabled={aiGenerating}>