fix(phone-input): add Austria mask and prevent double plus prefix (#26626)

* fix(phone-input): add Austria mask and prevent double plus prefix (#24193)

* updated code

* Update Austria phone mask format

---------

Co-authored-by: Anik Dhabal Babu <81948346+anikdhabal@users.noreply.github.com>

packages/features/components/phone-input/PhoneInput.tsx

@@ -14,6 +14,7 @@ import classNames from "@calcom/ui/classNames";
 const CUSTOM_PHONE_MASKS = {
   ci: ".. .. .. .. ..",
   bj: ".. .. .. .. ..",
+  at: "... ..........",
 };
 
 export type PhoneInputProps = {
@@ -80,7 +81,7 @@ function BasePhoneInput({
         autoComplete: "tel",
       }}
       onChange={(val: string) => {
-        onChange(`+${val}`);
+        onChange(val.startsWith("+") ? val : `+${val}`);
       }}
       containerClass={classNames(
         "hover:border-emphasis focus-within:border-emphasis border-default !bg-default rounded-md border focus-within:outline-none focus-within:ring-0 focus-within:ring-brand-default disabled:cursor-not-allowed",
@@ -132,7 +133,7 @@ function BasePhoneInputWeb({
         autoComplete: "tel",
       }}
       onChange={(val: string) => {
-        onChange(`+${val}`);
+        onChange(val.startsWith("+") ? val : `+${val}`);
       }}
       containerClass={classNames(
         "hover:border-emphasis focus-within:border-emphasis border-default !bg-default rounded-md border focus-within:outline-none focus-within:ring-0 focus-within:ring-brand-default disabled:cursor-not-allowed",