TICKET-007 (frontend): save-as-meal flow, collapsible meal rows, unpack, meal component editor

frontend/src/App.svelte

@@ -8,7 +8,7 @@
   import { api } from './lib/api.js'
   import {
     currentDate, appView, goPrevDay, goNextDay, setDate,
-    navigateTo, addLogEntryToStore, refreshDayData
+    navigateTo, addLogEntryToStore, refreshDayData, mealEdit
   } from './lib/stores.svelte.js'
   import { formatDate, formatKcal, defaultQuantity, previewCalories } from './lib/format.js'
   import Dashboard from './components/Dashboard.svelte'
@@ -337,6 +337,9 @@
     {:else if appView.current === 'createFood'}
       <FoodEditor />
 
+    {:else if appView.current === 'editMeal'}
+      <FoodEditor mealId={mealEdit.foodId} />
+
     {:else if appView.current === 'targetForm'}
       <div class="target-form-view">
         <button type="button" class="back-btn" onclick={() => appView.current = 'dashboard'}>← Back</button>