fix: restore pointer events after guild delete

[twoscott]

Summary

• What: Pops all modals after deleting a community
• Why: GuildSettingsModal remained orphaned on the modal stack, blocking pointer events
• Notes for reviewers: This PR fixes When deleting a server the app becomes unresponsive due to pointer-events not being handled #77

How to verify

1. Create a community
2. Open community settings
3. Delete the community
4. Enter password and confirm verification
5. The app should remain usable and page elements clickable

Tests

• Added/updated tests (where it makes sense)
• Unit tests: fluxer_app
• Integration tests:
• Manual verification: ran build locally and verified correct behaviour after changes

Checklist

• PR targets canary
• PR title follows Conventional Commits (mostly lowercase)
• CI is green (or I’m actively addressing failures)
• CLA signed (the bot will guide you on first PR)

Screenshots / recordings (UI changes)

[CLAassistant]

All committers have signed the CLA.