Replace v-phone-input with custom PhoneInput component

Implement a custom PhoneInput component to replace the third-party v-phone-input library. The new component provides country selection, phone number formatting, and integrates seamlessly with Vuetify's form controls. Updated CreateInterestModal and InterestDetailsModal to use the new component.

plugins/v-phone-input.client.ts

@@ -1,13 +0,0 @@
-import { defineNuxtPlugin } from '#app'
-import { createVPhoneInput } from 'v-phone-input'
-import 'v-phone-input/dist/v-phone-input.css'
-
-export default defineNuxtPlugin((nuxtApp) => {
-  const vPhoneInput = createVPhoneInput({
-    defaultCountry: 'US',
-    preferredCountries: ['US', 'FR', 'ES', 'PT', 'GB'],
-    enableSearchingCountry: true,
-  })
-  
-  nuxtApp.vueApp.use(vPhoneInput)
-})