Show common currencies first in dropdowns and default to USD in install wizard

Currency dropdowns now display the most-traded currencies (USD, EUR, GBP,
JPY, CAD, AUD, CHF, CNY, INR, BRL) at the top, followed by the rest
alphabetically. The install wizard defaults to USD instead of EUR and
formats currency names as "USD - US Dollar" for consistency with the
rest of the app.

tests/Feature/Admin/CurrencyTest.php

@@ -0,0 +1,70 @@
+<?php
+
+use App\Models\Currency;
+use App\Models\User;
+use Illuminate\Support\Facades\Artisan;
+use Laravel\Sanctum\Sanctum;
+
+use function Pest\Laravel\getJson;
+
+beforeEach(function () {
+    Artisan::call('db:seed', ['--class' => 'DatabaseSeeder', '--force' => true]);
+    Artisan::call('db:seed', ['--class' => 'DemoSeeder', '--force' => true]);
+
+    $user = User::find(1);
+    $this->withHeaders([
+        'company' => $user->companies()->first()->id,
+    ]);
+    Sanctum::actingAs(
+        $user,
+        ['*']
+    );
+});
+
+test('currencies endpoint returns common currencies first', function () {
+    $response = getJson('/api/v1/currencies')->assertOk();
+
+    $currencies = collect($response->json('data'));
+    $commonCodes = Currency::COMMON_CURRENCY_CODES;
+    $commonCount = count($commonCodes);
+
+    $firstCodes = $currencies->take($commonCount)->pluck('code')->toArray();
+
+    foreach ($commonCodes as $code) {
+        expect($firstCodes)->toContain($code);
+    }
+});
+
+test('common currencies follow the defined priority order', function () {
+    $response = getJson('/api/v1/currencies')->assertOk();
+
+    $currencies = collect($response->json('data'));
+    $commonCodes = Currency::COMMON_CURRENCY_CODES;
+    $commonCount = count($commonCodes);
+
+    $firstCodes = $currencies->take($commonCount)->pluck('code')->toArray();
+
+    expect($firstCodes)->toBe($commonCodes);
+});
+
+test('non-common currencies are sorted by name after common currencies', function () {
+    $response = getJson('/api/v1/currencies')->assertOk();
+
+    $currencies = collect($response->json('data'));
+    $commonCodes = Currency::COMMON_CURRENCY_CODES;
+    $commonCount = count($commonCodes);
+
+    $restNames = $currencies->skip($commonCount)->pluck('name')->toArray();
+    $sorted = $restNames;
+    sort($sorted, SORT_STRING | SORT_FLAG_CASE);
+
+    expect($restNames)->toBe($sorted);
+});
+
+test('all seeded currencies are returned', function () {
+    $response = getJson('/api/v1/currencies')->assertOk();
+
+    $currencies = collect($response->json('data'));
+
+    expect($currencies->count())->toBe(Currency::count());
+});