🛠️ Fixes and improvements

• The z-index issue with the Add an existing issue dropdown is resolved.
• Workspace members can no longer join private projects unless they've been added.
• Renaming a project no longer triggers an error.
• Resolved the issue where the project dropdown wouldn't appear when creating an issue after switching workspaces.
• Creating an issue in one project while being on another won't show an empty loader anymore.
• The Next.js package has been updated to resolve vulnerabilities.
• Labels and state color pickers dropdowns in Settings work fine now.