feat: localization, file restriction banners, test credentials, edit icon fix

- #553: Audit and verify localizations (en/es), replace hardcoded strings
- #549: Incomplete profile banner in Find Shifts (staff app)
- #550: File restriction banner on document upload page
- #551: File restriction banner on certificate upload page
- #552: File restriction banner on attire upload page
- #492: Hide edit icon for past/completed orders (client app)
- #524: Display worker benefits in staff app
- Add test credentials to seed: testclient@gmail.com, staff +1-555-555-1234
- Fix document upload validation (context arg in _validatePdfFile on submit)
- Add PR_LOCALIZATION.md

Made-with: Cursor

apps/mobile/packages/features/staff/authentication/lib/src/utils/test_phone_numbers.dart

@@ -1,6 +1,8 @@
 class TestPhoneNumbers {
   static const List<String> values = <String>[
-    '+15145912311', // Test User 1
+    '+15145912311',  // Test User 1
+    '+15557654321',  // Demo / Mariana
+    '+15555551234',  // Test User 2
   ];
 
   static bool isTestNumber(String phoneNumber) {