Phase 2: Remove page-level service location #692

Scope:\n- Remove direct MauiProgram.Container.Services access from pages.\n- Move page dependencies to constructor injection.\n- Focus on the current page-level call sites first.\n\nTarget files include:\n- TransactionProcessor.Mobile/Pages/Common/NoBackWithoutLogoutPage.cs\n- TransactionProcessor.Mobile/Pages/LoadingPage.xaml.cs\n- TransactionProcessor.Mobile/Pages/Support/ViewLogsPage.xaml.cs\n\nAcceptance criteria:\n- Pages no longer resolve services from MauiProgram.Container.\n- Pages still navigate and initialize correctly.