Fix Discord OAuth issues

[AlexthePear]

Discord OAuth Issues

Issues include a 401 error when fetching GuildMember, improper access control for unauthenticated users, and ensuring users are redirected back to their original destination after OAuth authentication.

Changes

Fix 401 Error when Fetching GuildMember

• Resolved an issue where a request to fetch GuildMember was returning a 401 Unauthorized error.
• Updated authentication headers to ensure the bot has proper authorization when making API requests.

Improve Authentication & Authorization

• Prevented users from accessing pages without proper authentication and authorization.
• Updated +Layout.svelte in the forms route to properly handle redirects instead of just creating them without execution.
• Fixing the previous issue with fetching GuildMember now enables a specified role to be required on a Server to be able to login.

Fix Incorrect login Redirect

• Resolved an issue where users were always redirected to the homepage after logging in instead of the original URL they attempted to access.
• Updated makeOAuth2URL to include state="", ensuring the original URL is saved throughout the OAuth process.

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