fix: include adaptive_mode when enabling adaptive timing toggle

The API requires adaptive_mode when adaptive_timing_enabled is true,
but the frontend was only sending the enabled flag. This caused 400
errors when users tried to toggle adaptive timing on.

Now the toggle sends both fields when enabling, satisfying the API
validation requirements.

synculous-client/src/app/dashboard/settings/page.tsx

@@ -427,7 +427,14 @@ export default function SettingsPage() {
                 <p className="text-sm text-gray-500 dark:text-gray-400">Adjust medication times based on your wake time</p>
               </div>
               <button
-                onClick={() => updateAdaptiveMeds({ adaptive_timing_enabled: !adaptiveMeds.adaptive_timing_enabled })}
+                onClick={() => {
+                  const newEnabled = !adaptiveMeds.adaptive_timing_enabled;
+                  const updates: Partial<AdaptiveMedSettings> = { adaptive_timing_enabled: newEnabled };
+                  if (newEnabled) {
+                    updates.adaptive_mode = adaptiveMeds.adaptive_mode;
+                  }
+                  updateAdaptiveMeds(updates);
+                }}
                 className={`w-12 h-7 rounded-full transition-colors ${
                   adaptiveMeds.adaptive_timing_enabled ? 'bg-indigo-500' : 'bg-gray-300 dark:bg-gray-600'
                 }`}