feat(tasks): enable sharing task lists with teams and users

internal/storage/sqlite_test.go

@@ -99,7 +99,7 @@ func TestStoreLifecycle(t *testing.T) {
 	}
 
 	// 5. Test TaskLists CRUD
-	taskList, err := store.CreateTaskList(user.ID, sp.ID, "Haus & Garten", "🏡", "#10b981")
+	taskList, err := store.CreateTaskList(user.ID, sp.ID, "", "Haus & Garten", "🏡", "#10b981")
 	if err != nil || taskList.ID == "" {
 		t.Fatalf("CreateTaskList failed: %v", err)
 	}
@@ -122,6 +122,20 @@ func TestStoreLifecycle(t *testing.T) {
 		t.Fatalf("AddTeamMember failed: %v", err)
 	}
 
+	// Test TaskList Sharing with Team
+	shareTeam, err := store.AddTaskListShare(taskList.ID, "team", team.ID, user.ID)
+	if err != nil || shareTeam.ID == "" {
+		t.Fatalf("AddTaskListShare team failed: %v", err)
+	}
+	tlShares, err := store.GetTaskListShares(taskList.ID)
+	if err != nil || len(tlShares) == 0 {
+		t.Fatalf("GetTaskListShares failed: %v", err)
+	}
+	fetchedTL, err := store.GetTaskListByID(user.ID, taskList.ID)
+	if err != nil || len(fetchedTL.Shares) == 0 {
+		t.Fatalf("GetTaskListByID with shares failed: %v", err)
+	}
+
 	// 7. Test System Settings
 	sysSettings, err := store.GetSystemSettings()
 	if err != nil || sysSettings.InstanceName == "" {