feat(ui): searchable language picker and light-mode keyword modals

app/resources/views/partials/language-datalist.blade.php

@@ -0,0 +1,17 @@
+@php
+    $listId = $id ?? 'language-options';
+    // Fallbacks only. Full list is generated in JS via Intl APIs.
+    $languages = [
+        ['code' => 'und', 'name' => 'Undetermined'],
+        ['code' => 'en', 'name' => 'English'],
+        ['code' => 'id', 'name' => 'Indonesian'],
+        ['code' => 'es', 'name' => 'Spanish'],
+        ['code' => 'fr', 'name' => 'French'],
+        ['code' => 'de', 'name' => 'German'],
+    ];
+@endphp
+<datalist id="{{ $listId }}" data-language-options="1">
+    @foreach ($languages as $language)
+        <option value="{{ $language['name'] }} ({{ $language['code'] }})" data-code="{{ $language['code'] }}"></option>
+    @endforeach
+</datalist>