feat(panel-switcher): add panel switcher plugin

[KilianTrunk]

No description provided.

[KilianTrunk]

here is the preview :

Screen.Recording.2025-07-31.at.11.25.06.mov

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.29%. Comparing base (bc76271) to head (4dc1153).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main      #20      +/-   ##
============================================
+ Coverage     73.10%   73.29%   +0.18%     
  Complexity      289      289              
============================================
  Files            54       54              
  Lines          1848     1861      +13     
============================================
+ Hits           1351     1364      +13     
  Misses          497      497              

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[KilianTrunk]

based on the plugin's source code, it already hides itself when there are fewer than 2 panels available :

if (count($static->getPanels()) < 2) {
    $static->visible(false);
}

source : vendor/bezhansalleh/filament-panel-switch/src/PanelSwitch.php

[SlimDeluxe]

Looks functional, but it's getting too crowded with all the switchers/dropdowns.
However, let's merge this and improve it later.

[SlimDeluxe]

Is there anything more you wanted to do here? If not, set it as "ready for review" so I can merge.
Don't worry about the translations, that's one of the last things to do, since this stuff could still change or even be removed.