register: fix username label and add uniqueness check

[rxtted]

before:

the username override renames the parent's name input but keeps the parent's label, which resolves to
"name". the form rendered a field labeled "name" while binding to the username column users sign in with.

the override also dropped the parent's unique check, so duplicate-username submissions fell through to user creation and surfaced the database unique index violation as an unhandled error.

change:

added an explicit username label using the panel's existing translation key, and a unique validation rule scoped to the username column. mirrors how the parent handles the email field.

after:

the field renders with the label "Username". duplicate submissions show "The username has already been taken."

Summary by CodeRabbit

• Bug Fixes
  • Registration username now enforces uniqueness to prevent duplicate accounts.
  • Username label is localized, showing the correct text for the user's language.
  • Validation and labeling improvements ensure clearer feedback on the registration form and reduce sign-up errors.

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 3f1a7491-8d2e-4d2e-9fd0-ab3f62e616d2

📥 Commits

Reviewing files that changed from the base of the PR and between 0480686 and 6390c87.

📒 Files selected for processing (1)

• register/src/Filament/Pages/Auth/Register.php

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📝 Walkthrough

Walkthrough

The registration page's username TextInput now sets its label to trans('profile.username') and enforces uniqueness via unique($this->getUserModel(), 'username').

Changes

Cohort / File(s)	Summary
Registration Form Field register/src/Filament/Pages/Auth/Register.php	Set username field label to trans('profile.username') and added a uniqueness validation constraint targeting the configured user model's username column (unique($this->getUserModel(), 'username')).

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related PRs

• register: fix username label and add uniqueness check #127 — Applies the same label localization and uniqueness validation change to the username field in register/src/Filament/Pages/Auth/Register.php.

Poem

🐰 A tiny tweak to name and rule,
Labelled kindly, tidy and cool,
One-of-a-kind, no twins allowed,
New usernames stand tall and proud,
Hooray — the register form hums aloud! 🎉

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title accurately summarizes the two main changes: fixing the username label and adding a uniqueness check, which directly correspond to the primary modifications in the changeset.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[Boy132]

LGTM