feat(ui): add group-by-model toggle to global context menu

Adds a 'Group by Model' toggle entry to the right-click global context
menu for quick access, complementing the existing setting in
Settings → Layout Settings. The menu item shows a checkmark indicator
reflecting the current state and immediately reloads the view on toggle.

Also fixes he.json translation that was mojibake (garbled characters).

Includes:
- Context menu HTML item with check-indicator
- JS toggle logic via settingsManager
- i18n for all 10 locales
- Hebrew translation fix

templates/components/context_menu.html

@@ -158,6 +158,11 @@
     <div class="context-menu-item" data-action="manage-excluded-models">
         <i class="fas fa-eye-slash"></i> <span>{{ t('globalContextMenu.manageExcludedModels.label', default='Manage Excluded Models') }}</span>
     </div>
+    <div class="context-menu-separator"></div>
+    <div class="context-menu-item" data-action="toggle-group-by-model">
+        <i class="fas fa-layer-group"></i> <span>{{ t('globalContextMenu.groupByModel.label') }}</span>
+        <i class="fas fa-check check-indicator" style="margin-left:auto;display:none"></i>
+    </div>
     <div class="context-menu-item" data-action="repair-recipes">
         <i class="fas fa-tools"></i> <span>{{ t('globalContextMenu.repairRecipes.label') }}</span>
     </div>