Task: Add input sanitization where needed

[iolyd]

Task Description

Some user inputs should be properly sanitized to avoid malicious entries in the database. This concern applies solely to inputs displayed back to users using {@html} (dangerously set html) or markdown contents.

To do

• Determine if sanitization should be at the ORM level or at Zod schemas' level (using transforms)
• Implement required helpers
• Add where needed across app forms