Improve note preview and editor padding

- Increased editor padding from 6 to 8 for better spacing
- Simplified preview generation to show first 100 characters
- Remove markdown syntax (#, *, `) from note previews for cleaner display
- Replaced multi-line filtering logic with direct substring approach

src/components/NoteEditor.tsx

@@ -44,7 +44,7 @@ export function NoteEditor({ note, onUpdateNote, fontSize, onUnsavedChanges }: N
     content: '',
     editorProps: {
       attributes: {
-        class: 'prose prose-slate max-w-none focus:outline-none p-6',
+        class: 'prose prose-slate max-w-none focus:outline-none p-8',
         style: `font-size: ${fontSize}px`,
       },
     },