Voyager ship/notifications updates

[simon0820s]

Notifications updates

Add content preview, content security validation, and quick notification creation from hackathons

Description

This PR introduces improvements to the notifications workflow, focusing on better UX when composing notifications and stronger content security validation.

Changes

Content Preview Card

• Added a Content Preview card to the notification creation form.
• Supports rendering of:
  • text/plain
  • text/markdown
  • text/html
• Allows users to preview how the notification will appear before sending it.

Content Security Validation

• Implemented validation to prevent unsafe content from being submitted.
• The system now detects and blocks potentially dangerous elements such as:
  • <script> tags
  • HTML event handlers (e.g. onclick, onerror)
  • unsafe URLs like javascript:
  • forbidden HTML tags (iframe, object, embed, etc.)

Hackathon Notification Shortcut

• Added a Create Notification button in the Hackathon Edit page.
• Enables admins/devrels to quickly create notifications directly from a hackathon.

Outcome

These changes:

• Improve the notification authoring experience
• Add content security safeguards
• Provide a faster workflow for sending hackathon-related notifications.

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