Add Text Attachments Delegate (#110)

### Description

Adds an API for receiving events from the text attachments manager.

### Related Issues

N/A

### Checklist

- [x] I read and understood the [contributing guide](https://github.com/CodeEditApp/CodeEdit/blob/main/CONTRIBUTING.md) as well as the [code of conduct](https://github.com/CodeEditApp/CodeEdit/blob/main/CODE_OF_CONDUCT.md)
- [x] The issues this PR addresses are related to each other
- [x] My changes generate no new warnings
- [x] My code builds and runs on my machine
- [x] My changes are all related to the related issue above
- [x] I documented my code

### Screenshots

N/A

Author: thecoolwinter

Sources/CodeEditTextView/TextLayoutManager/TextAttachments/TextAttachmentManager.swift

@@ -17,6 +17,8 @@ public final class TextAttachmentManager {
     weak var layoutManager: TextLayoutManager?
     private var selectionObserver: (any NSObjectProtocol)?
 
+    public weak var delegate: TextAttachmentManagerDelegate?
+
     /// Adds a new attachment, keeping `orderedAttachments` sorted by range.location.
     /// If two attachments overlap, the layout phase will later ignore the one with the higher start.
     /// - Complexity: `O(n log(n))` due to array insertion. Could be improved with a binary tree.
@@ -47,6 +49,8 @@ public final class TextAttachmentManager {
         }
 
         layoutManager?.setNeedsLayout()
+
+        delegate?.textAttachmentDidAdd(attachment.attachment, for: range)
     }
 
     /// Removes an attachment and invalidates layout for the removed range.
@@ -62,6 +66,9 @@ public final class TextAttachmentManager {
 
         let attachment = orderedAttachments.remove(at: index)
         layoutManager?.invalidateLayoutForRange(attachment.range)
+
+        delegate?.textAttachmentDidRemove(attachment.attachment, for: attachment.range)
+
         return attachment
     }
 

Sources/CodeEditTextView/TextLayoutManager/TextAttachments/TextAttachmentManagerDelegate.swift

@@ -0,0 +1,13 @@
+//
+//  TextAttachmentManagerDelegate.swift
+//  CodeEditTextView
+//
+//  Created by Khan Winter on 6/25/25.
+//
+
+import Foundation
+
+public protocol TextAttachmentManagerDelegate: AnyObject {
+    func textAttachmentDidAdd(_ attachment: any TextAttachment, for range: NSRange)
+    func textAttachmentDidRemove(_ attachment: any TextAttachment, for range: NSRange)
+}

Sources/CodeEditTextView/TextLine/LineFragmentRenderer.swift

@@ -92,9 +92,9 @@ public final class LineFragmentRenderer {
                     in: context,
                     rect: NSRect(
                         x: currentPosition,
-                        y: yPos,
+                        y: yPos + (lineFragment.heightDifference/2),
                         width: attachment.width,
-                        height: lineFragment.scaledHeight
+                        height: lineFragment.height
                     )
                 )
             }