Task 3: Build LoginScreen component with typing animation

- Created LoginScreen.tsx with character-by-character username typing (30ms/char)
- Password dots fill at 20ms per dot
- Button shows pressed state before transition
- Added 'login' phase to App.tsx flow
- Added PMR colors and fonts to tailwind.config.js
- Added Inter font family to index.html
- Respects prefers-reduced-motion: instant completion in ~500ms

src/types/index.ts

@@ -33,7 +33,7 @@ export interface ContactItem {
   href?: string
 }
 
-export type Phase = 'boot' | 'ecg' | 'content'
+export type Phase = 'boot' | 'ecg' | 'login' | 'content'
 
 export interface BootLine {
   html: string