Devlog 8 - Local Storage Support

I worked on saving data in the browser.

Before this update, all subjects disappeared whenever the page was refreshed.

This meant users would lose their information every time they closed or reloaded the website.

To improve this, I added local storage support.
Now the planner saves subject information directly in the browser. When the page loads again, the saved subjects are displayed automatically.

I spent some time learning how local storage works and testing different situations such as adding subjects, removing subjects, and refreshing the page.
This helped me make sure the saved data stays updated.