fix(headroom): toggle reflects enabled setting even when proxy is down

Toggle was checked={headroomEnabled && headroomRunning} and disabled when the proxy was down, so a downed proxy showed OFF while headroomEnabled stayed true in the DB. The engine only checks headroomEnabled, so it kept calling /v1/compress. Toggle now reflects the user setting; proxy up/down stays visible via the status chip.

Co-Authored-By: Claude <noreply@anthropic.com>

src/app/(dashboard)/dashboard/token-saver/TokenSaverClient.js

@@ -529,8 +529,7 @@ export default function TokenSaverClient() {
             </p>
           </div>
           <Toggle
-            checked={headroomEnabled && headroomRunning}
+            checked={headroomEnabled}
-            disabled={!headroomRunning}
             onChange={() => handleHeadroomEnabled(!headroomEnabled)}
           />
         </div>