feat: add ComfyUI integration for image generation

- Implemented ComfyUI API for generating images with various modes (text-to-image, image-to-image, inpaint, outpaint).
- Created GenerateSheet and associated controls for user input on generation settings.
- Added subtle scrollbar styles for improved UI experience.
- Enhanced canvas input handling to ignore key events when focused on editable elements.
- Optimized canvas resizing logic to prevent unnecessary dispatches.
- Introduced error handling for generation failures and loading models.
- Added functionality to upload images and masks for inpainting.

view/toolLabels.ts

@@ -2,6 +2,8 @@ import type { ToolId } from "@editor/tools";
 
 export function labelForTool(tool: ToolId): string {
   switch (tool) {
+    case "generate":
+      return "Generate";
     case "brush":
       return "Brush";
     case "chromaKey":