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/ShortcutsDisplay.tsx

@@ -8,6 +8,7 @@ type Shortcut = {
 
 const shortcuts: Shortcut[] = [
   { keys: ["S"], label: "Select" },
+  { keys: ["G"], label: "Generate" },
   { keys: ["B"], label: "Brush" },
   { keys: ["E"], label: "Eraser" },
   { keys: ["K"], label: "Chroma key" },