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.

resources/scripts/features/installation/views/PreferencesView.vue

@@ -137,7 +137,7 @@ import { clearInstallWizardAuth } from '../install-auth'
 import { useInstallationFeedback } from '../use-installation-feedback'
 
 interface PreferencesData {
-  currency: number
+  currency: number | null
   language: string
   carbon_date_format: string
   time_zone: string
@@ -157,6 +157,7 @@ interface DateFormatOption {
 interface CurrencyOption {
   id: number
   name: string
+  code: string
 }
 
 interface LanguageOption {
@@ -179,7 +180,7 @@ const timeZones = ref<KeyValueOption[]>([])
 const fiscalYears = ref<KeyValueOption[]>([])
 
 const currentPreferences = reactive<PreferencesData>({
-  currency: 3,
+  currency: null,
   language: 'en',
   carbon_date_format: 'd M Y',
   time_zone: 'UTC',
@@ -223,7 +224,19 @@ onMounted(async () => {
       installClient.get(`${API.CONFIG}?key=fiscal_years`),
       installClient.get(`${API.CONFIG}?key=languages`),
     ])
-    currencies.value = currRes.data.data ?? currRes.data
+    const rawCurrencies: CurrencyOption[] = currRes.data.data ?? currRes.data
+    currencies.value = rawCurrencies.map((c) => ({
+      ...c,
+      name: `${c.code} - ${c.name}`,
+    }))
+
+    if (!currentPreferences.currency) {
+      const usd = currencies.value.find((c) => c.code === 'USD')
+      if (usd) {
+        currentPreferences.currency = usd.id
+      }
+    }
+
     dateFormats.value = dateRes.data.data ?? dateRes.data
     timeZones.value = tzRes.data.data ?? tzRes.data
     fiscalYears.value = fyRes.data.data ?? fyRes.data ?? []