fix(auth): check mounted state before using ref after async operation causing error when debugging

[hatamirais]

Summary

Fixes an exception that occurs during login when the widget unmounts before the async operation completes.

Problem

The login screen throws a StateError during debugging:

Bad state: Using "ref" when a widget is about to or has been unmounted is unsafe

This happens because ref.read(authProvider) was called after the async signInWithEmail but before the mounted check.

Solution

Moved the if (!mounted) return; check to occur before accessing ref.read() after the await, following Flutter/Riverpod best practices for async safety.

Impact

• User impact: None (login already worked, just threw debug exceptions)
• Risk: Low — simple reordering of existing code

[supabase]

This pull request has been ignored for the connected project imveukxxtdwjgwsafwfl because there are no changes detected in supabase directory. You can change this behaviour in Project Integrations Settings ↗︎.

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