This change reverts an older workaround because the underlying behavior has been addressed elsewhere. Gantt popovers should continue to open properly within the visible browser area, reducing awkward positioning near the edge of the screen.

This reverts commit ebeb633be737eb7bd614c2b474fafd65cd54f0ae.

This update fixes attachment display issues so uploaded file elements no longer overlap in affected screens, including signing flows. It also removes unnecessary styling, making the interface more reliable and easier to maintain without changing business workflows.

* = social_facebook,social_instagram,social_linkedin,social_twitter

This commits fixes:
* file DOM element don't overlap when git filename (`o_attachement` in `sign`)
* remove useless CSS

task-4333465

This update adjusts internal Helpdesk email-related tests after a related file name change. It helps keep automated checks reliable while preparing for upcoming email recipient improvements, with no expected change for day-to-day users.