fix: change extension input from number to text to preserve leading zeros

[dmzoneill]

Summary

• Fixes Quick Create extension input field to properly handle extensions with leading zeros
• Changes input type from 'number' to 'text' with pattern validation

Problem

HTML <input type="number"> strips leading zeros from values. For example, if a user enters "0123", the browser will display and submit "123". This is problematic for phone extensions that legitimately start with zero.

Solution

Changed the extension input field to:

• type="text" - Preserves leading zeros as entered
• pattern="[0-9]*" - Ensures only numeric input is accepted
• Maintains all existing validation and functionality

Changes

• Modified /views/quickCreate.php line 56
• Input type: number → text
• Added pattern="[0-9]*" attribute

Testing

• Extensions with leading zeros (e.g., "0123") are now properly preserved
• Non-numeric input is rejected by the pattern attribute
• Existing validation still works correctly
• Applies to both FreePBX 16 and 17

Fixes #123

[sangoma-oss-cla]

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[dmzoneill]

Thank you for the CLA reminder. I'll review and sign the Contributor License Agreement to move this PR forward.