Add town and currency fields to user settings

Adds two new fields to user settings form:
- Town field: Text input for city/town (required when 2D code enabled)
- Currency field: Select dropdown with ISO 4217 currency codes (EUR default)

Updates:
- Database schema: Added town and currency fields to UserSettings
- Validation: Both fields required when 2D code is enabled
- Form UI: Added input fields with proper validation and error handling
- Translations: Added Croatian and English labels and error messages
- Currency options: 36 ISO 4217 codes with EUR at top as default

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

app/lib/actions/userSettingsActions.ts

@@ -17,7 +17,9 @@ export type State = {
         firstName?: string[];
         lastName?: string[];
         street?: string[];
+        town?: string[];
         iban?: string[];
+        currency?: string[];
         show2dCodeInMonthlyStatement?: string[];
     };
     message?: string | null;
@@ -31,6 +33,7 @@ const FormSchema = (t: IntlTemplateFn) => z.object({
     firstName: z.string().optional(),
     lastName: z.string().optional(),
     street: z.string().optional(),
+    town: z.string().optional(),
     iban: z.string()
         .optional()
         .refine(
@@ -42,6 +45,7 @@ const FormSchema = (t: IntlTemplateFn) => z.object({
             },
             { message: t("iban-invalid") }
         ),
+    currency: z.string().optional(),
     show2dCodeInMonthlyStatement: z.boolean().optional().nullable(),
 })
 .refine((data) => {
@@ -71,6 +75,15 @@ const FormSchema = (t: IntlTemplateFn) => z.object({
     message: t("street-required"),
     path: ["street"],
 })
+.refine((data) => {
+    if (data.show2dCodeInMonthlyStatement) {
+        return !!data.town && data.town.trim().length > 0;
+    }
+    return true;
+}, {
+    message: t("town-required"),
+    path: ["town"],
+})
 .refine((data) => {
     if (data.show2dCodeInMonthlyStatement) {
         if (!data.iban || data.iban.trim().length === 0) {
@@ -84,6 +97,15 @@ const FormSchema = (t: IntlTemplateFn) => z.object({
 }, {
     message: t("iban-required"),
     path: ["iban"],
+})
+.refine((data) => {
+    if (data.show2dCodeInMonthlyStatement) {
+        return !!data.currency && data.currency.trim().length > 0;
+    }
+    return true;
+}, {
+    message: t("currency-required"),
+    path: ["currency"],
 });
 
 /**
@@ -113,7 +135,9 @@ export const updateUserSettings = withUser(async (user: AuthenticatedUser, prevS
         firstName: formData.get('firstName') || undefined,
         lastName: formData.get('lastName') || undefined,
         street: formData.get('street') || undefined,
+        town: formData.get('town') || undefined,
         iban: formData.get('iban') || undefined,
+        currency: formData.get('currency') || undefined,
         show2dCodeInMonthlyStatement: formData.get('generateTenantCode') === 'on',
     });
 
@@ -126,7 +150,7 @@ export const updateUserSettings = withUser(async (user: AuthenticatedUser, prevS
         };
     }
 
-    const { firstName, lastName, street, iban, show2dCodeInMonthlyStatement } = validatedFields.data;
+    const { firstName, lastName, street, town, iban, currency, show2dCodeInMonthlyStatement } = validatedFields.data;
 
     // Normalize IBAN: remove spaces and convert to uppercase
     const normalizedIban = iban ? iban.replace(/\s/g, '').toUpperCase() : null;
@@ -140,7 +164,9 @@ export const updateUserSettings = withUser(async (user: AuthenticatedUser, prevS
         firstName: firstName || null,
         lastName: lastName || null,
         street: street || null,
+        town: town || null,
         iban: normalizedIban,
+        currency: currency || null,
         show2dCodeInMonthlyStatement: show2dCodeInMonthlyStatement ?? false,
     };