feat: multi-user support, goals editing, shared food library

Multi-user:
- Madiha account with per-user nav visibility
- Dashboard greeting uses actual user display name
- Navbar and MobileTabBar accept visibleApps prop
- Madiha sees: Dashboard, Trips, Fitness, Budget, Media (no Inventory, Reader)

Goals editing:
- Goals page now has Edit Goals mode with inline number inputs
- Saves via PUT /api/fitness/goals
- Shows "No goals set" state for new users

Food library:
- Default view shows all shared foods (not just user's recent)
- Both users see the same food database
- Cleaned up duplicates: archived Eggs (kept Egg), Green Grapes (kept Grapes),
  duplicate Bellwether Yogurt, Latte Macchiato (kept Madiha's Caramel Latte)

Add to meal buttons:
- "Add to breakfast/lunch/dinner/snack" now focuses the resolve input
  and sets the meal type so AI logs to the correct meal

frontend-v2/src/routes/(app)/+page.svelte

@@ -1,8 +1,11 @@
 <script lang="ts">
 	import { onMount } from 'svelte';
+	import { page } from '$app/state';
 	import DashboardActionCard from '$lib/components/dashboard/DashboardActionCard.svelte';
 	import BudgetModule from '$lib/components/dashboard/BudgetModule.svelte';
 	import FitnessModule from '$lib/components/dashboard/FitnessModule.svelte';
+
+	const userName = $derived((page as any).data?.user?.display_name || 'there');
 	import IssuesModule from '$lib/components/dashboard/IssuesModule.svelte';
 
 	let inventoryIssueCount = $state(0);
@@ -59,7 +62,7 @@
 	<div class="app-surface">
 		<div class="page-header">
 			<div class="page-title">Dashboard</div>
-			<div class="page-greeting">Good to see you, <strong>Yusuf</strong></div>
+			<div class="page-greeting">Good to see you, <strong>{userName}</strong></div>
 		</div>
 
 		<div class="action-cards">