Issue #3605990 by sriram: Fix overlapping file-browser-actions hiding the selection button

Sriramrequested to merge
issue/file_browser-3605990:3605990-problem-with-modal into 2.x

Problem: Two elements receive the .file-browser-actions class (the widget actions bar and the selection display). The CSS pins every .file-browser-actions with position: fixed; inset-block-end: 0, so the second stacks on top of the first and hides its button (visible under the Gin admin theme).

Solution: Un-pin the trailing adjacent .file-browser-actions bar with inset-block-end: auto so it flows above the fixed action bar instead of covering it. One CSS rule, no markup/PHP changes, no magic numbers.

Testing: Drupal 11.3.13, File Entity Browser 2.0.8, Gin 5.0.15. Verified in both the modal and inline browse_files views — the action button is now fully visible and clickable. phpcs (Drupal standard) passes clean.

Credit to @scottsawyer for the diagnosis and the sibling-selector approach.

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