feat(validation): clarify username format and uniqueness error messages

[trtajim]

Description

This PR improves user experience during profile edits and user onboarding by providing clear and explicit validation messages when username requirements are not met:

• Format / Regex: Username can only contain letters, numbers, and underscores. Dots aren't allowed.
• Uniqueness: This username is already taken. Please choose another one.

Changes

• Added custom messages() in UpdateProfileRequest, StoreUserRequest, and UpdateUserRequest.
• Updated AuthController onboarding username validation message.
• Added feature tests in ProfileUsernameTest to verify clear error messages on invalid format and duplicate usernames.

Summary by CodeRabbit

• Bug Fixes

  • Improved username validation messages across onboarding, profile updates, and user management.
  • Clearly explains that dots are not allowed in usernames.
  • Provides a specific message when a username is already taken.

• Tests

  • Added coverage for invalid username formats and duplicate usernames during profile updates.

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Advanced

Run ID: f3e51b08-1a70-491f-b9e2-3209e1c2aa96

📥 Commits

Reviewing files that changed from the base of the PR and between 97fd6f1 and 7282aea.

📒 Files selected for processing (5)

• app/Http/Controllers/AuthController.php
• app/Http/Requests/Profile/UpdateProfileRequest.php
• app/Http/Requests/User/StoreUserRequest.php
• app/Http/Requests/User/UpdateUserRequest.php
• tests/Feature/ProfileUsernameTest.php

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📝 Walkthrough

Walkthrough

Username validation now returns explicit messages for invalid characters and duplicate values. Profile feature tests verify both messages.

Changes

Username validation

Layer / File(s)	Summary
Validation message contracts app/Http/Requests/Profile/UpdateProfileRequest.php, app/Http/Requests/User/StoreUserRequest.php, app/Http/Requests/User/UpdateUserRequest.php, app/Http/Controllers/AuthController.php	Request classes define custom messages for username format and uniqueness rules. The authentication message states that dots are not allowed.
Profile validation coverage tests/Feature/ProfileUsernameTest.php	Feature tests verify the messages for usernames containing dots and usernames already in use.

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Feature

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/custom-username-validation-messages

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