fix: only show unlisted project chip when it's the main project

[SylvainChevalier]

Closes #4687

Summary

Hides unlisted project chips in the question page sidebar when the unlisted project is a secondary project. Unlisted projects are still shown when they are the question's main (default) project.

Implementation

Added a filter in sidebar_question_projects.tsx that drops any project with visibility === ProjectVisibility.Unlisted unless its id matches default_project.id.

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[github-actions]

🚀 Preview Environment

Your preview environment is ready!

Resource	Details
🌐 Preview URL	https://metaculus-pr-4690-claude-issue-4687-only-show-un-preview.mtcl.cc
📦 Docker Image	ghcr.io/metaculus/metaculus:claude-issue-4687-only-show-unlisted-project-chip-35a7b0f
🗄️ PostgreSQL	NeonDB branch preview/pr-4690-claude-issue-4687-only-show-un
⚡ Redis	Fly Redis mtc-redis-pr-4690-claude-issue-4687-only-show-un

Details

• Commit: 35a7b0f05b4ac9816a72ceb0a812fc1cb7bd31e4
• Branch: claude/issue-4687-only-show-unlisted-project-chip
• Fly App: metaculus-pr-4690-claude-issue-4687-only-show-un

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[SylvainChevalier]

@claude the unlisted project chips are still visible even when they're not the default project.

[claude]

Claude finished @SylvainChevalier's task in 7m 6s —— View job

---

Investigation

• Read the modified file (sidebar_question_projects.tsx)
• Trace the filter logic through to backend serializers
• Reviewed ProjectVisibility enum (frontend "unlisted") and backend Visibility.UNLISTED = "unlisted" — values match
• Confirmed TournamentShortSerializer and CommunitySerializer include visibility in their output

Analysis

The filter at sidebar_question_projects.tsx:44-49 reads:

.filter(
  (project) =>
    !("visibility" in project) ||
    project.visibility !== ProjectVisibility.Unlisted ||
    project.id === defaultProjectId
);

Equivalent to: filter OUT a project when has visibility AND is unlisted AND id !== default_project.id. By inspection this should correctly hide a non-default unlisted tournament/community chip. Categories and leaderboard tags have no visibility and are unaffected.

Before I push a code change, I want to make sure I understand what you're seeing — could you confirm one of these for me:

1. Is it that the filter isn't running at all? e.g. you're on a preview where the latest commit hasn't deployed. The current preview image (...-35a7b0f) was built 10 days ago — please confirm you're testing https://metaculus-pr-4690-claude-issue-4687-only-show-un-preview.mtcl.cc or local with this branch.
2. Or do you actually want unlisted chips hidden in all cases, including when the unlisted project is the default project? The current PR intentionally keeps the chip in that case (per the PR description), but if you want them always hidden, that's a one-line change (drop the project.id === defaultProjectId exception).
3. Or is the chip you're seeing not a tournament/community/index — e.g. is it a category or leaderboard_tag tied to an unlisted project? Those types don't carry a visibility field, so the current filter can't hide them.

If you can paste the URL of a question where you observe the bug (and ideally which chip is still showing), I can dig into the specific data and push a targeted fix.
• Branch: claude/issue-4687-only-show-unlisted-project-chip