103 flash message

[conwelld]

starting on the home page, click on the top right on "administration"

Then click on "add course"

Fill out the information, with whatever dummy data you want, then the flash message will pop up, and disappear after 5 seconds

Issue Description

Fixes #<103>

• Flash messages stayed on screen until the next page load, so they piled up and cluttered the view.

Changes

• Added a timeout in app.js that fades out flash messages after a few seconds and removes them from the DOM.
• Updated the HTML so flash messages have the class/wrapper that the script targets.
• Screenshot or short screen recording of the message fading out.

Testing

• Run the app locally and trigger an action that produces a flash message.
• Confirm the message appears, then fades and disappears on its own without a page reload.
• Trigger two messages back-to-back and confirm both clear independently.
• Confirm nothing shifts or breaks on the page after the message is removed.