Fix onboarding and auth routing for user journeys

[Kvnbbg]

Motivation

• Users experienced confusing or broken navigation during onboarding and auth state hydration because the router started on /home and redirects did not account for an unknown auth state.
• The welcome CTA led guests into a protected route, creating redirect loops and poor first-run UX.

Description

• Set the router initialLocation to /welcome to make the onboarding entry point deterministic for first-time and returning users.
• Added handling for AuthStatus.unknown in the router redirect so the app stays on /welcome while auth state hydrates.
• Updated redirect logic to send unauthenticated users to /login for protected routes and to send authenticated users away from /welcome, /login, and /register to /home.
• Changed the WelcomeScreen CTA to navigate to login instead of home to avoid immediate protected-route navigation for guests.

Testing

• Attempted to run flutter test, but the Flutter SDK is not available in the execution environment (flutter: command not found), so widget/unit tests could not be executed.
• Performed a static check of the web JS bundle with node --check web/app.js, which completed without syntax errors.
• Verified file changes and inspected the updated Dart sources via file content listings to confirm the applied edits.

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Codex Task

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