fix(pos-app): replace Intl.NumberFormat.formatToParts with format to support Hermes (#410)

* fix(pos-app): replace Intl.NumberFormat.formatToParts with format to support Hermes

formatToParts is not available in Hermes, causing crashes when pressing number buttons in the amount input. Replace with a simpler approach using format() which extracts the group separator by stripping all digits.

Fixes crash on Android/iOS when entering amount.

* fix(pos-app): bump versionCode and fix misleading comment

Increment Android versionCode to 20 and update comment in
getGroupSeparator to accurately describe the digit-stripping approach.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

Author: ignaciosantise

dapps/pos-app/app.json

@@ -41,7 +41,7 @@
         "android.permission.BLUETOOTH_ADVERTISE",
         "android.permission.USB_PERMISSION"
       ],
-      "versionCode": 19
+      "versionCode": 20
     },
     "web": {
       "output": "static",

dapps/pos-app/components/big-amount-input/utils/formatAmount.ts

@@ -32,8 +32,11 @@ export function parseRawValue(rawValue: string): number {
 }
 
 function getGroupSeparator(locale: SupportedLocale): string {
-  const parts = new Intl.NumberFormat(locale).formatToParts(10000);
-  return parts.find((p) => p.type === "group")?.value ?? ",";
+  // Avoid formatToParts — not supported in Hermes
+  const formatted = new Intl.NumberFormat(locale).format(10000);
+  // Strip all digits — what remains is the group separator (e.g. "," or ".")
+  const sep = formatted.replace(/\d/g, "");
+  return sep.charAt(0) || ",";
 }
 
 function addThousandsSeparators(integerStr: string, separator: string): string {