webui: chat rendering refactor + image_read PNG compression

tools/image_read

@@ -35,6 +35,25 @@ if not mime:
 with open(file_path, 'rb') as f:
     data = f.read()
 
+MAX_SIZE = 128 * 1024
+
+if mime == 'image/png' and len(data) > MAX_SIZE:
+    from PIL import Image
+    import io
+    img = Image.open(io.BytesIO(data))
+    # progressively scale down until under budget
+    for scale in [1.0, 0.75, 0.5, 0.35, 0.25]:
+        buf = io.BytesIO()
+        if scale < 1.0:
+            new_size = (int(img.width * scale), int(img.height * scale))
+            resized = img.resize(new_size, Image.LANCZOS)
+        else:
+            resized = img
+        resized.save(buf, format='PNG', optimize=True)
+        data = buf.getvalue()
+        if len(data) <= MAX_SIZE:
+            break
+
 b64 = base64.b64encode(data).decode('ascii')
 
 print(json.dumps({"isError": False, "content": [

webui

@@ -1 +1 @@
-Subproject commit 6d21f142afda6f870556229e4acfdbb2c5fbfdc4
+Subproject commit aa0e99213dffc26c8ebb54b13946afefbc205b29