fix: Filer property popup did note close

[fsbraun]

Description

Fix filer admin dropzone/file widget behaviour to properly reset state and avoid popup/autocomplete conflicts, improve layout, and refine selection/action UI.

Bug Fixes:

• Remove incompatible autocomplete context attribute from filer file widget to prevent Django popup JavaScript issues.
• Ensure Dropzone preview template is correctly loaded and clear buttons are triggered on drop to close/clear filer property popups.
• Correct selection counter default handling in the folder directory list template to avoid string defaults.
• Fix documentation string typo in permission admin autocomplete configuration.

Enhancements:

• Increase drag-and-drop widget minimum width and adjust admin CSS and JavaScript to improve dropzone appearance, responsiveness, and hover states.
• Refine list and bulk-action UI behaviour in the navigator, including action enabling, selection toggles, and breadcrumb/search interactions.
• Bundle and update filer-base and admin-file-widget JavaScript assets to reflect the new Dropzone and UI logic.

This PR fixes #1577, though the underlying issue is not fully understood.

Related resources

• Filer Popup not closing if opened from CMS-Plugin config modal. #1577
• #...

Checklist

• I have opened this pull request against master
• I have added or modified the tests when changing logic
• I have followed the conventional commits guidelines to add meaningful information into the changelog
• I have read the contribution guidelines and I have joined #workgroup-pr-review on
  Slack to find a “pr review buddy” who is going to review my pull request.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.98%. Comparing base (6ea5d6d) to head (dc81c69).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1578   +/-   ##
=======================================
  Coverage   76.98%   76.98%           
=======================================
  Files          78       78           
  Lines        3671     3672    +1     
  Branches      498      498           
=======================================
+ Hits         2826     2827    +1     
  Misses        675      675           
  Partials      170      170           

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[sourcery-ai]

Sorry @fsbraun, your pull request is larger than the review limit of 150000 diff characters