Fs26 24 notes keeper

[lucas-works]

What I did

• Added CreateNote component using React and MUI
• Basic form validation (title and content required)
• Show error message if inputs are empty
• Successfully submitted notes appear as cards

How to test

1. Click the input area to expand
2. Enter title and content, then click the add button
3. Empty fields will show an error in red
4. Filled fields will create a new note card

Related issue

FS26-24