Enforce Length Limit of 15 Integers for Phone Numbers

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Description:
To ensure data integrity and consistency, the Admin dashboard should enforce a length limit of exactly 15 integers for phone numbers. Currently, there is no restriction in place, allowing users to enter phone numbers of any length.

Feature Requirements:

1- Phone Number Length Validation:
Implement input validation to enforce a maximum length of 15 integers for phone numbers across all relevant sections of the Admin dashboard.
Ensure that any input longer than 15 integers is rejected with an appropriate error message.

2- Error Messaging:
Display a clear and user-friendly error message when a phone number exceeds the 15-integer limit. For example: "Phone numbers must be exactly 15 digits long."

3- Consistency Across Forms:
Apply this validation consistently across all forms and sections where phone numbers are entered, including user profiles, contact forms, and any other relevant fields.

Benefits:
Ensures that only valid phone numbers are entered, maintaining data integrity.
Prevents potential issues related to invalid phone numbers in communication and data processing.
Provides a consistent user experience by enforcing uniform input standards.

Additional Information:
This feature will help in maintaining a standardized format for phone numbers, which is crucial for backend processing and integration with external systems.
Consider any existing data that might not meet this requirement and plan for a data cleanup or migration if necessary.

Screenshots/Mockups:
(https://github.com/user-attachments/assets/bd2e5a8a-14b7-4ce8-b4ba-e1b5c4a3615d)

Possible Solution:
Implement a validation check in the phone number input fields that restricts the length to 15 integers. This can be achieved through frontend validation (e.g., using HTML5 input attributes) as well as backend validation to ensure data integrity.

Start by locating the Admin dashboard phone-number inputs and any existing frontend and backend validation. Review every form mentioned in the issue, including user profiles and contact forms. Done means inputs consistently reject values over 15 digits and show the specified user-facing error; the issue also flags possible cleanup or migration for existing data.

Written by the indexing model from the issue text.