fix: prevent note editor from expanding beyond dialog bounds (#528)

Add max-height and overflow constraints to MarkdownEditor component
to prevent the textbox from expanding indefinitely when typing.
The editor now scrolls internally instead of pushing the save
button out of view.

- Added max-h-[500px] to limit editor height
- Added overflow-hidden to container
- Made internal editor content scrollable with overflow-y-auto

frontend/src/app/(dashboard)/notebooks/components/NoteEditorDialog.tsx

@@ -162,7 +162,7 @@ export function NoteEditorDialog({ open, onOpenChange, notebookId, note }: NoteE
                       height={420}
                       placeholder={t.sources.writeNotePlaceholder}
                       className={cn(
-                          "w-full h-full min-h-[420px] [&_.w-md-editor]:!static [&_.w-md-editor]:!w-full [&_.w-md-editor]:!h-full",
+                          "w-full h-full min-h-[420px] max-h-[500px] overflow-hidden [&_.w-md-editor]:!static [&_.w-md-editor]:!w-full [&_.w-md-editor]:!h-full [&_.w-md-editor-content]:overflow-y-auto",
                           !isEditorFullscreen && "rounded-md border"
                       )}
                     />