Fix admin date/time picker popup width

[izilic333]

Fixes #469.

django-admin-interface applies width: 100% to .admin-interface .module. Django admin date/time picker popups are rendered as .calendarbox.module and .clockbox.module, so they inherit full module width and can expand across the page.

This adds widget-specific CSS rules to restore the default Django admin popup widths:

• .calendarbox -> 19em
• .clockbox -> auto

The generic module layout remains unchanged.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.48%. Comparing base (f8885b0) to head (9e5c025).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #485   +/-   ##
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  Coverage   97.48%   97.48%           
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  Files          40       40           
  Lines         438      438           
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  Hits          427      427           
  Misses         11       11           

Flag	Coverage Δ
unittests	97.48% <ø> (ø)

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[Copilot]

Pull request overview

This PR fixes a UI regression in django-admin-interface where the Django admin date/time picker popups (calendar and clock) were expanding to full width due to the project’s global .admin-interface .module { width: 100%; } styling. It does so by adding widget-specific width overrides while leaving the generic module layout unchanged.

Changes:

• Add .admin-interface .calendarbox { width: 19em; } to restore the Django default calendar popup width.
• Add .admin-interface .clockbox { width: auto; } to prevent the clock popup from inheriting full module width.

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