Refactor: apply PhoneInputCustom to ScreenPortofolioCreate

Changes:
- Replace react-native-international-phone-number with PhoneInputCustom
- Remove ICountry dependency, use CountryData from constants
- Update state management (inputValue → phoneNumber)
- Improve phone number formatting logic
- Add handleCountryChange for better country switching

Features Applied:
✅ NO emoji flags - only calling codes (+62, +65, etc)
✅ Clean, professional UI
✅ Modal country picker with search
✅ Real-time phone number formatting
✅ Auto-update country code on change
✅ Consistent with LoginView implementation

Phone Input Logic:
- Format on every phone change
- Re-format when country changes
- Remove duplicate country codes
- Remove leading zeros
- Store E.164 format in API data

UI:
- Phone Input: [+62 ⌄ | xxx-xxx-xxx]
- Country Picker: Modal with search
- Display: Country name + calling code only

Co-authored-by: Qwen-Coder <qwen-coder@alibabacloud.com>

package.json

@@ -48,6 +48,7 @@
     "expo-symbols": "~1.0.7",
     "expo-system-ui": "~6.0.7",
     "expo-web-browser": "~15.0.9",
+    "libphonenumber-js": "^1.12.40",
     "lodash": "^4.17.21",
     "moti": "^0.30.0",
     "react": "19.1.0",