Enhance canvas functionality with new node types and validation

- Added support for new canvas node types: curves, color-adjust, light-adjust, detail-adjust, and render.
- Implemented validation for adjustment nodes to restrict incoming edges to one.
- Updated canvas connection validation to improve user feedback on invalid connections.
- Enhanced node creation and rendering logic to accommodate new node types and their properties.
- Refactored related components and utilities for better maintainability and performance.

lib/image-pipeline/source-loader.ts

@@ -0,0 +1,35 @@
+const imageBitmapCache = new Map<string, Promise<ImageBitmap>>();
+
+export async function loadSourceBitmap(sourceUrl: string): Promise<ImageBitmap> {
+  if (!sourceUrl || sourceUrl.trim().length === 0) {
+    throw new Error("Render sourceUrl is required.");
+  }
+
+  if (typeof createImageBitmap !== "function") {
+    throw new Error("ImageBitmap is not available in this environment.");
+  }
+
+  const cached = imageBitmapCache.get(sourceUrl);
+  if (cached) {
+    return await cached;
+  }
+
+  const promise = (async () => {
+    const response = await fetch(sourceUrl);
+    if (!response.ok) {
+      throw new Error(`Render source failed: ${response.status}`);
+    }
+
+    const blob = await response.blob();
+    return await createImageBitmap(blob);
+  })();
+
+  imageBitmapCache.set(sourceUrl, promise);
+
+  try {
+    return await promise;
+  } catch (error) {
+    imageBitmapCache.delete(sourceUrl);
+    throw error;
+  }
+}