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>

components/PhoneInput/PhoneInputCustom.tsx

@@ -1,6 +1,5 @@
 import { MainColor } from "@/constants/color-palet";
 import {
-  COUNTRIES,
   DEFAULT_COUNTRY,
   searchCountries,
   type CountryData,
@@ -61,7 +60,6 @@ export default function PhoneInputCustom({
           activeOpacity={0.7}
         >
           <Text style={styles.countryCodeText}>+{selectedCountry.callingCode}</Text>
-          <Text style={styles.dropdownIcon}>⌄</Text>
         </TouchableOpacity>
 
         <View style={styles.divider} />
@@ -73,7 +71,6 @@ export default function PhoneInputCustom({
           value={value}
           onChangeText={handlePhoneChange}
           keyboardType="phone-pad"
-          returnKeyType="done"
           autoComplete="tel"
           importantForAutofill="yes"
           editable={!disabled}