refactor: skip boot/ECG/login sequence for dev iteration speed

Temporarily set initial phase to 'pmr' to bypass the ~10s boot animation
during the refactoring process. Will be reverted in Phase 4.3.

src/App.tsx

@@ -45,7 +45,7 @@ function SkipButton({ onSkip }: { onSkip: () => void }) {
 }
 
 function App() {
-  const [phase, setPhase] = useState<Phase>('boot')
+  const [phase, setPhase] = useState<Phase>('pmr')
   const cursorPositionRef = useRef<{ x: number; y: number } | null>(null)
 
   useEffect(() => {