2 files changed, 35 insertions, 2 deletions
diff --git a/internal/config/constants.go b/internal/config/constants.go
index a199404..9eba843 100644
--- a/internal/config/constants.go
+++ b/internal/config/constants.go
@@ -39,7 +39,7 @@ const (
 
 // Session settings
 const (
-	SessionLifetime = 24 * time.Hour
+	SessionLifetime = 7 * 24 * time.Hour // 7 days for mobile convenience
 )
 
 // Rate limiting
diff --git a/internal/models/types.go b/internal/models/types.go
index ab06ea2..8ec2095 100644
--- a/internal/models/types.go
+++ b/internal/models/types.go
@@ -1,6 +1,10 @@
 package models
 
-import "time"
+import (
+	"sort"
+	"strings"
+	"time"
+)
 
 // Task represents a task from Todoist
 type Task struct {
@@ -60,6 +64,35 @@ type ShoppingCategory struct {
 	Items []UnifiedShoppingItem
 }
 
+// FlattenItemsForStore extracts all items for a specific store, sorted by checked status then name
+func FlattenItemsForStore(stores []ShoppingStore, storeName string) []UnifiedShoppingItem {
+	var items []UnifiedShoppingItem
+	for _, store := range stores {
+		if strings.EqualFold(store.Name, storeName) {
+			for _, cat := range store.Categories {
+				items = append(items, cat.Items...)
+			}
+		}
+	}
+	// Sort: unchecked first, then by name
+	sort.Slice(items, func(i, j int) bool {
+		if items[i].Checked != items[j].Checked {
+			return !items[i].Checked
+		}
+		return items[i].Name < items[j].Name
+	})
+	return items
+}
+
+// StoreNames returns the names of all stores
+func StoreNames(stores []ShoppingStore) []string {
+	names := make([]string, len(stores))
+	for i, store := range stores {
+		names[i] = store.Name
+	}
+	return names
+}
+
 // List represents a Trello list
 type List struct {
 	ID   string `json:"id"`