Improve Error Handling for Home Screen Offline State

[RayBB]

Current Behavior

When attempting to open the app without an internet connection, users encounter an unfriendly error message:
ServerError: unknown error: ClientException with SocketException: Failed host lookup 'YYY.com' (OS Error: No address associated with hostname, errno = 7)

Expected Behavior

• App should gracefully handle offline state
• Show a user-friendly message indicating no internet connection

Steps to Reproduce

1. Put device in airplane mode or disable internet connection
2. Open Frigoligo app
3. Observe error message

Additional Context

• This affects the app's "Offline first" goal stated in the project philosophy

Proposed Solution

Implement proper offline state handling:

1. Add connection state detection
2. Show appropriate UI feedback for offline state

Screenshots

Spoiler