fix: getGoalsForDate method name, non-optional goal

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

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

@@ -45,8 +45,9 @@ final class GoalsViewModel {
             )
             try await api.updateGoals(request)
             // Reload goals to get the full updated object
-            goal = try await api.getGoals(date: Date().apiDateString)
-            populateFields(from: goal)
+            let updated = try await api.getGoalsForDate(date: Date().apiDateString)
+            goal = updated
+            populateFields(from: updated)
             saveSuccess = true
         } catch {
             self.error = error.localizedDescription