Add permission checks to project options interface

[Copilot]

The /project/options interface allowed any authenticated user to view project configuration and member lists for projects they weren't members of. The backend GET /project/:id endpoint validates permissions, but the frontend displayed data without checking membership.

Changes

• Added authgate() method to ProjectOptions and ProjectCustomization components that validates user is in project.collaborators before rendering
• Shows permission error page via existing renderPermissionError() utility when unauthorized
• Uses in operator for safe property checking: userId in project.collaborators

Implementation

authgate(project) {
    if (!this.checkUserIsCollaborator(project)) {
        this.renderPermissionError()
        return
    }
    this.render()
}

checkUserIsCollaborator(project) {
    if (!project) return false
    const userId = getUserFromToken(TPEN.getAuthorization())
    if (!userId) return false
    return project.collaborators && userId in project.collaborators
}

Follows the same pattern as /interfaces/transcription and /interfaces/manage-project.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Project Options Interface No Permissions Necessary</issue_title>
<issue_description>I can load the /project/options interface for any project, even those I am not a part of. There are no warnings.

Logically, this means the service to GET the project data did not care who I was either. </issue_description>

<agent_instructions>If there is a similar issue needed in TPEN-Services, please create that as well.</agent_instructions>

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

• Fixes Project Options Interface No Permissions Necessary #363

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