fix: Don't use BuildContext across async gaps (use_build_context_synchronously)

[Muneerali199]

Summary

flutter analyze flags 4 locations across both apps where a BuildContext is used after an await without a proper mounted guard. This can cause crashes if the widget is unmounted between the async call and the context usage.

Affected Files

patient app

File	Line	Detail
lib/presentation/result/book_appointment.dart	55	use_build_context_synchronously
lib/provider/therapist_provider.dart	65, 69	use_build_context_synchronously

therapist app

File	Line	Detail
lib/presentation/auth/personal_details_screen.dart	115, 124	use_build_context_synchronously — guarded by an unrelated mounted check

Steps to Reproduce

cd patient && flutter analyze
cd ../therapist && flutter analyze

Expected Behavior

All context usages after await are guarded by if (!mounted) return or the context reference is captured before the async gap.

Fix

• Add if (!mounted) return; immediately after each await before accessing context
• In personal_details_screen.dart: move the mounted check to guard the specific context access (not an unrelated branch)