Move image clipboard task to done

tasks/done/025-image-clipboard-support.md

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+---
+title: Image Clipboard
+description: Support pasting images from the clipboard.
+---
+
+Implement Image Clipboard Support
+
+---
+
+### Detect Image Paste
+
+Detect when image data is present in the system clipboard during a paste event.
+
+Prioritize image data over text data if both are present.
+
+---
+
+### Create Image Attachment
+
+Automatically create an image attachment from the pasted image data. Convert the image to a base64 encoded format for internal handling and submission.
+
+Display the image attachment as a chip in the input area.
+
+---
+
+### Acceptance Criteria
+
+- Pasting an image from the clipboard creates an image attachment chip.
+- The image data is base64 encoded and associated with the attachment.
+- The attachment chip has a suitable display name (e.g., `[Image #1]`).
+- Users can clear the image attachment.