[ai] Make /icon command work on macOS too.

.claude/grab_clipboard.sh

@@ -0,0 +1,28 @@
+#!/bin/bash
+# Grab clipboard image on macOS and save as PNG.
+outPath="$1"
+if [ -z "$outPath" ]; then
+    echo "Usage: grab_clipboard.sh <output.png>"
+    exit 1
+fi
+
+osascript -e '
+set theFile to POSIX file "'"$outPath"'"
+try
+    set theImage to the clipboard as «class PNGf»
+on error
+    return "no image"
+end try
+set fh to open for access theFile with write permission
+write theImage to fh
+close access fh
+return "ok"
+' 2>/dev/null | grep -q "ok"
+
+if [ $? -eq 0 ]; then
+    echo "Saved to $outPath"
+    exit 0
+else
+    echo "No image on clipboard"
+    exit 1
+fi