chore: fine tune auth config

[peppescg]

Auth:

• replace import from constant rather read directly from env in auth.ts
• leverage scopes from env var

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nit: I replace the title, description metadata and removed a bunch of leftover vercel svg

[Copilot]

Pull request overview

This PR makes the OIDC scopes configurable via environment variable instead of using hardcoded values. The changes centralize configuration by moving OIDC_CLIENT_ID and OIDC_CLIENT_SECRET to use imported constants and introduce a new OIDC_SCOPES environment variable.

Key Changes:

• Added OIDC_SCOPES constant that parses comma-separated scopes from environment variable
• Refactored auth configuration to use imported constants instead of inline environment variable access
• Replaced hardcoded scopes array ["openid", "email", "profile", "offline_access"] with configurable OIDC_SCOPES

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
src/lib/auth/constants.ts	Adds new OIDC_SCOPES constant that parses comma-separated scopes from OIDC_SCOPES environment variable
src/lib/auth/auth.ts	Updates OIDC configuration to use imported constants (OIDC_CLIENT_ID, OIDC_CLIENT_SECRET, OIDC_SCOPES) instead of inline environment variable access and hardcoded values