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

PulseHealth/Services/APIService.swift

@@ -110,6 +110,16 @@ class APIService {
         return try await fetch("/finance/transactions", method: "POST", token: token, body: body)
     }
 
+    // MARK: - Savings
+
+    func getSavingsCategories(token: String) async throws -> [SavingsCategory] {
+        return try await fetch("/savings/categories", token: token)
+    }
+
+    func getSavingsStats(token: String) async throws -> SavingsStats {
+        return try await fetch("/savings/stats", token: token)
+    }
+
     func getFinanceCategories(token: String) async throws -> [FinanceCategory] {
         return try await fetch("/finance/categories", token: token)
     }