Replace browser logout confirmation with custom modal #1377
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This PR improves the logout user experience by introducing an in-app confirmation modal and removing browser-based dialogs. It also cleans up UI structure by removing footer elements from authenticated views.
Changes

Implemented a custom MUI-based logout confirmation modal.
Removed usage of browser window.confirm for logout.
Ensured logout occurs only after explicit user confirmation.
Removed footer components from logged-in layouts.
Fixes #1374