feat: nutrition trend/history view (v0.69.0)

Extends GET /api/v1/users/me/nutrition-diary with a `range` query
param (7/30/90) that switches it into trend mode -- daily
calorie/macro totals bucketed from the same cooking-history rows the
single-day diary already reads, with zero-filled days so the chart
has a continuous x-axis. New NutritionTrend component reuses the
existing hand-rolled TimeSeriesChart (previously admin-only, now
imported from user-facing code too) for the calorie line, plus
simple average-macro stat tiles below it.

Nutrition page now has Diary/Trend tabs instead of just the diary.

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

apps/web/app/api/v1/users/me/nutrition-diary/route.ts

@@ -6,11 +6,19 @@ function isValidDate(value: string): boolean {
   return /^\d{4}-\d{2}-\d{2}$/.test(value) && !isNaN(new Date(`${value}T00:00:00.000Z`).getTime());
 }
 
+const VALID_RANGES = [7, 30, 90];
+
 export async function GET(req: NextRequest) {
   const { session, response } = await requireSession();
   if (response) return response;
   const userId = session!.user.id;
 
+  const rangeParam = req.nextUrl.searchParams.get("range");
+  const range = rangeParam ? parseInt(rangeParam, 10) : null;
+  if (range && VALID_RANGES.includes(range)) {
+    return getTrend(userId, range);
+  }
+
   const dateParam = req.nextUrl.searchParams.get("date");
   const date = dateParam && isValidDate(dateParam) ? dateParam : new Date().toISOString().slice(0, 10);
 
@@ -101,3 +109,56 @@ export async function GET(req: NextRequest) {
 
   return NextResponse.json({ date, totals, goals, coverage, entries, unknownCount });
 }
+
+/** Multi-day trend: daily calorie/macro totals over the last N days, one
+ * bucket per calendar day (UTC, matching the single-day endpoint's own
+ * dayStart/dayEnd math above) — days with nothing cooked still appear with
+ * zero totals so the chart has a continuous x-axis. */
+async function getTrend(userId: string, days: number): Promise<NextResponse> {
+  const todayStr = new Date().toISOString().slice(0, 10);
+  const since = new Date(`${todayStr}T00:00:00.000Z`);
+  since.setUTCDate(since.getUTCDate() - (days - 1));
+
+  const rows = await db
+    .select({
+      servings: cookingHistory.servings,
+      cookedAt: cookingHistory.cookedAt,
+      baseServings: recipes.baseServings,
+      nutritionData: recipes.nutritionData,
+    })
+    .from(cookingHistory)
+    .leftJoin(recipes, eq(cookingHistory.recipeId, recipes.id))
+    .where(and(eq(cookingHistory.userId, userId), gte(cookingHistory.cookedAt, since)));
+
+  const buckets = new Map<string, { calories: number; proteinG: number; carbsG: number; fatG: number }>();
+  for (let i = 0; i < days; i++) {
+    const d = new Date(since);
+    d.setUTCDate(d.getUTCDate() + i);
+    buckets.set(d.toISOString().slice(0, 10), { calories: 0, proteinG: 0, carbsG: 0, fatG: 0 });
+  }
+
+  for (const row of rows) {
+    const perServing = row.nutritionData?.perServing;
+    if (!perServing) continue;
+    const servings = row.servings ?? row.baseServings ?? 1;
+    const key = row.cookedAt.toISOString().slice(0, 10);
+    const bucket = buckets.get(key);
+    if (!bucket) continue;
+    bucket.calories += perServing.calories * servings;
+    bucket.proteinG += perServing.proteinG * servings;
+    bucket.carbsG += perServing.carbsG * servings;
+    bucket.fatG += perServing.fatG * servings;
+  }
+
+  const goalsRow = await db.query.userNutritionGoals.findFirst({ where: eq(userNutritionGoals.userId, userId) });
+
+  const daysOut = [...buckets.entries()].map(([date, totals]) => ({
+    date,
+    calories: Math.round(totals.calories),
+    proteinG: Math.round(totals.proteinG),
+    carbsG: Math.round(totals.carbsG),
+    fatG: Math.round(totals.fatG),
+  }));
+
+  return NextResponse.json({ range: days, days: daysOut, goalCalories: goalsRow?.caloriesKcal ?? null });
+}