refactor: use uuid for temp filenames and fix alphabet typo

Fixed a duplicate 'p' and missing 'w' in the manual alphabet string by removing it. Standardized logic to use uuid4().hex[:5] as seen in PreviewUI3D.

comfy_api/latest/_ui.py

@@ -2,7 +2,6 @@ from __future__ import annotations
 
 import json
 import os
-import random
 import uuid
 from io import BytesIO
 
@@ -390,7 +389,7 @@ class PreviewImage(_UIOutput):
     def __init__(self, image: Image.Type, animated: bool = False, cls: type[ComfyNode] = None, **kwargs):
         self.values = ImageSaveHelper.save_images(
             image,
-            filename_prefix="ComfyUI_temp_" + ''.join(random.choice("abcdefghijklmnopqrstupvxyz") for _ in range(5)),
+            filename_prefix="ComfyUI_temp_" + uuid.uuid4().hex[:5],
             folder_type=FolderType.temp,
             cls=cls,
             compress_level=1,
@@ -414,7 +413,7 @@ class PreviewAudio(_UIOutput):
     def __init__(self, audio: dict, cls: type[ComfyNode] = None, **kwargs):
         self.values = AudioSaveHelper.save_audio(
             audio,
-            filename_prefix="ComfyUI_temp_" + "".join(random.choice("abcdefghijklmnopqrstuvwxyz") for _ in range(5)),
+            filename_prefix="ComfyUI_temp_" + uuid.uuid4().hex[:5],
             folder_type=FolderType.temp,
             cls=cls,
             format="flac",

nodes.py

@@ -11,7 +11,7 @@ import inspect
 import traceback
 import math
 import time
-import random
+import uuid
 import logging
 
 from PIL import Image, ImageOps, ImageSequence
@@ -1683,7 +1683,7 @@ class PreviewImage(SaveImage):
     def __init__(self):
         self.output_dir = folder_paths.get_temp_directory()
         self.type = "temp"
-        self.prefix_append = "_temp_" + ''.join(random.choice("abcdefghijklmnopqrstupvxyz") for x in range(5))
+        self.prefix_append = "_temp_" + uuid.uuid4().hex[:5]
         self.compress_level = 1
 
     SEARCH_ALIASES = ["preview", "preview image", "show image", "view image", "display image", "image viewer"]