feat: round embedded note images

Sources/Conjure/NotesController.swift

@@ -619,6 +619,15 @@ private final class NotesView: NSView {
     }
 }
 
+private final class RoundedImageAttachmentCell: NSTextAttachmentCell {
+    override func draw(withFrame cellFrame: NSRect, in controlView: NSView?) {
+        NSGraphicsContext.saveGraphicsState()
+        defer { NSGraphicsContext.restoreGraphicsState() }
+        NSBezierPath(roundedRect: cellFrame, xRadius: 8, yRadius: 8).addClip()
+        super.draw(withFrame: cellFrame, in: controlView)
+    }
+}
+
 
 @MainActor
 enum MarkdownHighlighting {
@@ -677,6 +686,9 @@ enum MarkdownHighlighting {
             let size = image.size
             let scale = min(1, 460 / max(size.width, 1), 240 / max(size.height, 1))
             if scale < 1 { image.size = NSSize(width: size.width * scale, height: size.height * scale) }
+            if !(cell is RoundedImageAttachmentCell) {
+                attachment.attachmentCell = RoundedImageAttachmentCell(imageCell: image)
+            }
         }
         storage.removeAttribute(.strikethroughStyle, range: range)
         storage.addAttribute(hiddenMarkup, value: false, range: range)