feat: Inline edit support for contact info (#13976)

# Pull Request Template

## Description

This PR adds inline editing support for contact name, phone number,
email, and company fields in the conversation contact sidebar

## Type of change

- [x] New feature (non-breaking change which adds functionality)

## How Has This Been Tested?

**Screencast**


https://github.com/user-attachments/assets/e9f8e37d-145b-4736-b27a-eb9ea66847bd



## Checklist:

- [x] My code follows the style guidelines of this project
- [x] I have performed a self-review of my code
- [ ] I have commented on my code, particularly in hard-to-understand
areas
- [ ] I have made corresponding changes to the documentation
- [x] My changes generate no new warnings
- [ ] I have added tests that prove my fix is effective or that my
feature works
- [x] New and existing unit tests pass locally with my changes
- [ ] Any dependent changes have been merged and published in downstream
modules

---------

Co-authored-by: Pranav <pranav@chatwoot.com>
Co-authored-by: Muhsin Keloth <muhsinkeramam@gmail.com>

app/javascript/shared/helpers/CustomErrors.js

@@ -1,10 +1,19 @@
 /* eslint-disable max-classes-per-file */
 export class DuplicateContactException extends Error {
+  static DEFAULT_MESSAGE = 'DUPLICATE_CONTACT';
+
   constructor(data) {
-    super('DUPLICATE_CONTACT');
+    super(DuplicateContactException.DEFAULT_MESSAGE);
     this.data = data;
     this.name = 'DuplicateContactException';
   }
+
+  /** Server or client may assign `message` after construction; otherwise still DEFAULT_MESSAGE. */
+  get contactErrorDetail() {
+    return this.message === DuplicateContactException.DEFAULT_MESSAGE
+      ? null
+      : this.message;
+  }
 }
 export class ExceptionWithMessage extends Error {
   constructor(data) {