💄 Update test assertions and directory fixture

Refine test assertions in HomeControllerTest and update
directory fixture values for better clarity and accuracy.

💄 Add safe URL helper to prevent XSS attacks

Introduce a new `safe_url` method to sanitize URLs and ensure only safe
protocols are used. Update link helpers in user and directory submission
views to utilize this new method.

⬆️ Upgrade dependencies in Gemfile.lock

Update various gems to their latest versions for improved performance and security.