fix(call): hide remaining call-related UI when calls are disabled

[notoriousisk]

Hello! This is my first contribution to this repository. Looking forward to your feedback

☑️ Resolves

• Fix [Enhancement] Hide call-related settings and dashboard buttons when calls are disabled (Follow-up to #17215) #17390

AI (if applicable)

• The content of this PR was partly or fully generated using AI

🖌️ UI Checklist

🖼️ Screenshots / Screencasts

Dashboard actions and upcoming meetings

🏚️ Before	🏡 After

App settings: devices / appearance

🏚️ Before	🏡 After

Keyboard shortcuts

🏚️ Before	🏡 After

Participant permissions

🏚️ Before	🏡 After

Conversation notification settings

🏚️ Before	🏡 After

🚧 Tasks

• Hide remaining call-related dashboard actions when calls are disabled
• Hide dashboard join buttons for upcoming meetings when calls are disabled
• Hide call-only app settings sections and shortcuts when calls are disabled
• Hide conversation call-related settings and SIP-related sidebar actions when calls are disabled
• Disable call-related permission controls when calls are disabled while keeping non-call permissions editable

🏁 Checklist

• 🌏 Tested with different browsers / clients:
  • Chromium (Chrome / Edge / Opera / Brave)
  • Firefox
  • Safari
  • Talk Desktop
  • Integrations with Files sidebar and other apps
  • Not risky to browser differences / client
• 🖌️ Design was reviewed, approved or inspired by the design team
• ⛑️ Tests are included or not possible
• 📗 User documentation in https://github.com/nextcloud/documentation/tree/master/user_manual/talk has been updated or is not required

[notoriousisk]

Force-pushed to fix DCO: rewrote the 4 commits so author/signoff match correctly. No code changes.

[Antreesy]

Thanks for the work done! Left some comments on the changes:

to prevent merge before comments addressed

[notoriousisk]

Thanks for the review
Addressed the review comments and pushed the requested changes.
I applied the suggested simplifications, added the missing call-notification check in the sidebar, and updated the permissions settings hints so they only change when calls are disabled.
@Antreesy could you take another look?

[Antreesy]

Looks nice now, tested.
Thanks for the great contribution! 🎉