re-add theme as ptrs broken fixed ipad theme

IOS12_BUILD_FIX.md

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+# iOS 12 build fix
+
+The root build command now installs each module's own locked npm dependencies before Vite runs.
+This is required because Modules/Helpdesk/Resources/assets/js/app.js imports jquery, select2 and flatpickr from Modules/Helpdesk/package.json.
+
+Use:
+
+    npm install
+    npm run build
+
+Do not manually install jquery/select2/flatpickr into the root project.

IOS12_COMPATIBILITY.md

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+# iOS 12 compatibility
+
+The backend detects iOS 12 in `resources/themes/backend/views/partials/head.blade.php` and adds an `ios12` class to `<html>`. The compatibility rules are at the end of `resources/themes/backend/assets/css/helpdesk.css`.
+
+The iOS 12 dashboard deliberately uses flexbox instead of CSS Grid and uses inline SVG for critical shell/dashboard icons so it does not depend on modern Font Awesome webfont behaviour. Modern browsers continue to use the normal theme.