fix: goals save API (void response), user greeting, goal field labels

- Goals PUT returns partial JSON, use putVoid + reload
- Home shows 'Hi, Yusuf' instead of 'Home'
- EmptyResponse type for void-like endpoints

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

ios/Platform/Platform/Core/APIClient.swift

@@ -1,5 +1,13 @@
 import Foundation
 
+// Accepts any JSON response (for void-like endpoints that return partial data)
+private struct EmptyResponse: Decodable {
+    init(from decoder: Decoder) throws {
+        // Accept anything
+        _ = try? decoder.singleValueContainer()
+    }
+}
+
 enum APIError: Error, LocalizedError {
     case invalidURL
     case httpError(Int, String)
@@ -138,6 +146,10 @@ final class APIClient {
         try await request("PUT", path: path, body: body)
     }
 
+    func putVoid(_ path: String, body: any Encodable) async throws {
+        let _: EmptyResponse = try await request("PUT", path: path, body: body)
+    }
+
     func delete<T: Decodable>(_ path: String) async throws -> T {
         try await request("DELETE", path: path)
     }

ios/Platform/Platform/Features/Fitness/API/FitnessAPI.swift

@@ -30,8 +30,8 @@ struct FitnessAPI {
         )
     }
 
-    func updateGoals(_ request: UpdateGoalsRequest) async throws -> DailyGoal {
-        try await api.put("\(basePath)/goals", body: request)
+    func updateGoals(_ request: UpdateGoalsRequest) async throws {
+        try await api.putVoid("\(basePath)/goals", body: request)
     }
 
     func updateEntry(id: String, body: UpdateEntryRequest) async throws -> FoodEntry {

ios/Platform/Platform/Features/Fitness/ViewModels/GoalsViewModel.swift

@@ -43,9 +43,10 @@ final class GoalsViewModel {
                 sugar: Double(editSugar) ?? 0,
                 fiber: Double(editFiber) ?? 0
             )
-            let updated = try await api.updateGoals(request)
-            goal = updated
-            populateFields(from: updated)
+            try await api.updateGoals(request)
+            // Reload goals to get the full updated object
+            goal = try await api.getGoals(date: Date().apiDateString)
+            populateFields(from: goal)
             saveSuccess = true
         } catch {
             self.error = error.localizedDescription

ios/Platform/Platform/Features/Home/HomeView.swift

@@ -23,9 +23,17 @@ struct HomeView: View {
                 VStack(spacing: 16) {
                     // Top bar
                     HStack {
+                        VStack(alignment: .leading, spacing: 2) {
+                            if let name = auth.currentUser?.displayName {
+                                Text("Hi, \(name)")
+                                    .font(.title.weight(.bold))
+                                    .foregroundStyle(vm.hasBackground ? .white : Color.textPrimary)
+                            } else {
                                 Text("Home")
                                     .font(.title.weight(.bold))
                                     .foregroundStyle(vm.hasBackground ? .white : Color.textPrimary)
+                            }
+                        }
                         Spacer()
                         Menu {
                             PhotosPicker(