feat: savings tab, fix pull-to-refresh, beautiful modals, fix signing

PulseHealth/Views/Habits/HabitsView.swift

@@ -56,11 +56,11 @@ struct HabitsView: View {
             }
         }
         .task { await loadHabits() }
-        .refreshable { await loadHabits() }
+        .refreshable { await loadHabits(refresh: true) }
     }
 
-    func loadHabits() async {
-        isLoading = true
+    func loadHabits(refresh: Bool = false) async {
+        if !refresh { isLoading = true }
         habits = (try? await APIService.shared.getHabits(token: authManager.token)) ?? []
         isLoading = false
     }