Welcome Screen

Implement the welcome screen with the text "Hi, !" and a "Continue" button.

📋 Acceptance Criteria

• GIVEN the app is launched

• WHEN the welcome screen is displayed

• THEN the user sees a personalized greeting and a "Continue" button

• GIVEN the user taps "Continue"

• WHEN the button is pressed

• THEN the user is taken to the initial screen

✅ Please check the Definition of Done before moving this issue to Close.