feat: add ESSENTIALS_CATEGORY to core nodes

Marked nodes:
- Basic: LoadImage, SaveImage, LoadVideo, SaveVideo, Load3D, CLIPTextEncode
- Image Tools: ImageScale, ImageInvert, ImageBatch, ImageCrop, ImageRotate, ImageBlur
- Image Tools/Preprocessing: Canny
- Image Generation: LoraLoader
- Audio: LoadAudio, SaveAudio

Amp-Thread-ID: https://ampcode.com/threads/T-019c2b25-cd90-7218-9071-03cb46b351b3

nodes.py

@@ -69,6 +69,7 @@ class CLIPTextEncode(ComfyNodeABC):
     FUNCTION = "encode"
 
     CATEGORY = "conditioning"
+    ESSENTIALS_CATEGORY = "Basic"
     DESCRIPTION = "Encodes a text prompt using a CLIP model into an embedding that can be used to guide the diffusion model towards generating specific images."
     SEARCH_ALIASES = ["text", "prompt", "text prompt", "positive prompt", "negative prompt", "encode text", "text encoder", "encode prompt"]
 
@@ -667,6 +668,8 @@ class CLIPSetLastLayer:
         return (clip,)
 
 class LoraLoader:
+    ESSENTIALS_CATEGORY = "Image Generation"
+
     def __init__(self):
         self.loaded_lora = None
 
@@ -1648,6 +1651,7 @@ class SaveImage:
     OUTPUT_NODE = True
 
     CATEGORY = "image"
+    ESSENTIALS_CATEGORY = "Basic"
     DESCRIPTION = "Saves the input images to your ComfyUI output directory."
     SEARCH_ALIASES = ["save", "save image", "export image", "output image", "write image", "download"]
 
@@ -1706,6 +1710,7 @@ class LoadImage:
                 }
 
     CATEGORY = "image"
+    ESSENTIALS_CATEGORY = "Basic"
     SEARCH_ALIASES = ["load image", "open image", "import image", "image input", "upload image", "read image", "image loader"]
 
     RETURN_TYPES = ("IMAGE", "MASK")
@@ -1863,6 +1868,7 @@ class ImageScale:
     FUNCTION = "upscale"
 
     CATEGORY = "image/upscaling"
+    ESSENTIALS_CATEGORY = "Image Tools"
     SEARCH_ALIASES = ["resize", "resize image", "scale image", "image resize", "zoom", "zoom in", "change size"]
 
     def upscale(self, image, upscale_method, width, height, crop):
@@ -1902,6 +1908,7 @@ class ImageScaleBy:
 
 class ImageInvert:
     SEARCH_ALIASES = ["reverse colors"]
+    ESSENTIALS_CATEGORY = "Image Tools"
 
     @classmethod
     def INPUT_TYPES(s):
@@ -1918,6 +1925,7 @@ class ImageInvert:
 
 class ImageBatch:
     SEARCH_ALIASES = ["combine images", "merge images", "stack images"]
+    ESSENTIALS_CATEGORY = "Image Tools"
 
     @classmethod
     def INPUT_TYPES(s):