Change the native browser alert to to a shadcn alert.

[IamKirbki]

Problem Statement

Currently when getting an alert you get a native browser alert. This should be replaced by a shadcn alert as it looks better.

Proposed Solution

Change the alert on every page that uses it with a shadcn alert.

Technical Implementation

• Add the shadcn alert to the project.
• Search for every page that uses the native browser alert and replace it with the shadcn alert.

Additional Context

No response

Acceptance Criteria

• The shadcn alert only makes visual changes, the implementations stay the same.