feat: Improve port conflict handling

[Nithishvb]

Description

Closes: #1365

This PR introduces a warning modal that appears when the application detects that port 3000 is already in use.

Related Issues

Type of Change

• [ ] Bug fix
• [ ] New feature
• [ ] Documentation update
• [ ] Release
• [ ] Other (please describe):

Testing

Screenshots (if applicable)

Additional Notes