refactor: added back support for did/PDS logins and passes the locale onto the oauth screen

[fatfingers23]

• Handle input supports did/PDS logins and has some validation if it's a did or handle to show an error. Stripes the @ still
• Passes the locale onto the OAuth screen. Only works for en, fr-FR, and ja-JP. So does a check then defaults ot en
• Had a bug where reditect_to was not being passed for handle logins

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Tracked Files

File	Note
lunaria/files/en-GB.json	Localization changed, will be marked as complete.
lunaria/files/en-US.json	Source changed, localizations will be marked as outdated.

Warnings reference

Icon	Description
🔄️	The source for this localization has been updated since the creation of this pull request, make sure all changes in the source have been applied.

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Codecov Report

❌ Patch coverage is 18.75000% with 13 lines in your changes missing coverage. Please review.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
app/components/Header/AuthModal.client.vue	20.00%	11 Missing and 1 partial ⚠️
app/utils/atproto/helpers.ts	0.00%	0 Missing and 1 partial ⚠️

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[coderabbitai]

📝 Walkthrough

Walkthrough

This pull request introduces input validation and locale support to the authentication flow. The AuthModal component now validates handle inputs before OAuth redirects, displays error messages for invalid entries, and normalises input by trimming and removing special characters. Locale support is added throughout the authentication pipeline, including the OAuth redirect construction and server-side locale resolution constrained to supported locales (en, fr-FR, ja-JP). Translation strings for validation error messages are added to English locale files. The ATProto syntax validation library is integrated into the build configuration via Nuxt modules and Vite optimisation.

🚥 Pre-merge checks | ✅ 1

✅ Passed checks (1 passed)

Check name	Status	Explanation
Description check	✅ Passed	The PR description accurately relates to the changeset, covering input validation for DIDs/handles, locale passing to OAuth, and the redirect_to bug fix.

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• Create PR with unit tests
• Post copyable unit tests in a comment

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[coderabbitai]

Caution

Some comments are outside the diff and can’t be posted inline due to platform limitations.

⚠️ Outside diff range comments (1)

app/components/Header/AuthModal.client.vue (1)

49-56: ⚠️ Potential issue | 🟠 Major

Only strip a leading “@” to avoid changing valid input.
Removing every “@” can turn an email-like string into a different, valid-looking handle and bypass the intended validation.

Proposed fix

-  const normalized = newHandleInput.trim().toLowerCase().replace(/@/g, '')
+  const normalized = newHandleInput.trim().toLowerCase().replace(/^@+/, '')

🧹 Nitpick comments (1)

server/api/auth/atproto.get.ts (1)

16-18: Replace the informal locale note with a concise description.
The current comment is conversational and doesn’t explain non-obvious logic. A short neutral note (or removal) would be clearer.

Proposed tidy-up

-//I did not have luck with other ones than these. I got this list from the PDS language picker
+// Supported OAuth UI locales from the PDS language picker.
 const OAUTH_LOCALES = new Set(['en', 'fr-FR', 'ja-JP'])

As per coding guidelines, “Add comments only to explain complex logic or non-obvious implementations”.