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/lib/changelog.ts

@@ -1,5 +1,5 @@
 // Mirrors CHANGELOG.md at the repo root — update both together.
-export const APP_VERSION = "0.68.0";
+export const APP_VERSION = "0.69.0";
 
 export type ChangelogEntry = {
   version: string;
@@ -11,6 +11,13 @@ export type ChangelogEntry = {
 };
 
 export const CHANGELOG: ChangelogEntry[] = [
+  {
+    version: "0.69.0",
+    date: "2026-07-22 09:00",
+    added: [
+      "Nutrition page gets a Trend tab alongside the daily Diary: a 7/30/90-day calorie chart plus daily protein/carbs/fat averages, computed from the same cooking history the diary already tracks.",
+    ],
+  },
   {
     version: "0.68.0",
     date: "2026-07-21 10:00",