Add TikTok OAuth provider to console UI

[Copilot]

Adds TikTok as a selectable OAuth provider in the console's authentication settings.

Changes

• Provider registry (src/lib/stores/oauth-providers.ts): Added TikTok entry with icon, documentation link, and Main component
• Tests (src/lib/stores/oauth-providers.test.ts): Validated provider configuration and field requirements

Integration

TikTok appears in Project Settings → Auth → OAuth2 Providers with the same UX as other providers:

• App ID and App Secret input fields
• Auto-generated OAuth2 redirect URI: {endpoint}/account/sessions/oauth2/callback/tiktok/{projectId}
• Links to https://developers.tiktok.com/doc/login-kit-web

TikTok icons already exist in /static/icons/{dark,light}/color/tiktok.svg. Backend support for TikTok OAuth required for full functionality.

[!WARNING]

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• o1.ingest.sentry.io
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Original prompt

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This section details on the original issue you should resolve

<issue_title>Frontend (@appwrite/console): Add TikTok OAuth UI</issue_title> <issue_description>Update @appwrite/console (front end) to support TikTok OAuth integration:

• Add TikTok as a selectable authentication provider in UI
• Provide input fields for TikTok credentials in console's project settings/auth settings
• Display relevant error messages and validation for TikTok
• Update login/sign-in forms to include TikTok
• Write tests covering UI changes

Reference UI for other OAuth providers for consistency.</issue_description>

Comments on the Issue (you are @copilot in this section)

@stnguyen90 @jaysomani, thanks for your interest! We'd prefer to keep this internal as there might be some back and forth on the icons. If you're interested in contributing, please see our [contributing docs](https://github.com/appwrite/appwrite/blob/main/CONTRIBUTING.md#how-to-start).

• Fixes appwrite/console#2544

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