v2.2.1 — Responsive Layout for Desktop

What's Changed

🖥️ Responsive Layout for Desktop

The app was optimized for mobile/PWA but looked stretched on desktop. Now it adapts to screen size:

Screen	Width	Layout
Mobile	< 600px	Single column (unchanged)
Tablet	600-900px	Centered, max 600px
Desktop	> 900px	Two columns, max 1100px

Files Changed

• New: responsive_layout.dart, centered_content.dart
• Updated: home_screen.dart, subscription_form_screen.dart, settings_screen.dart

Notes

• Mobile/PWA experience unchanged
• 58 tests passing

Full Changelog: v2.2.0...v2.2.1