feat: add firestore indexes & rule for ballot questions feature

[fastfadingviolets]

Summary

These are the indexes needed for #2090. This PR would merge them to main so they stop being wiped out in dev. Should have no effect on existing queries, etc.

Checklist

• On the frontend, I've made my strings translate-able.
• If I've added shared components, I've added a storybook story.
• I've made pages responsive and look good on mobile.
• If I've added new Firestore queries, I've added any new required indexes to firestore.indexes.json (Please do not only create indexes through the Firebase Web UI, even though the error messages may reccommend it - indexes created this way may be obliterated by subsequent deploys)

Screenshots

Add some screenshots highlighting your changes.

Known issues

If you've run against limitations or caveats, include them here. Include follow-up issues as well.

Steps to test/reproduce

For each feature or bug fix, create a step by step list for how a reviewer can test it out. E.g.:

1. Go to the home page
2. Click on a testimony
3. See that it's loaded with a loading spinner

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Project	Deployment	Actions	Updated (UTC)
maple-dev	Ready	Preview, Comment	Apr 7, 2026 3:50pm