feat(canvas): add video-prompt node and enhance video generation support

- Introduced a new node type "video-prompt" for AI video generation, including its integration into the canvas command palette and node template picker.
- Updated connection validation to allow connections from text nodes to video-prompt and from video-prompt to ai-video nodes.
- Enhanced error handling and messaging for video generation failures, including specific cases for provider issues.
- Added tests to validate new video-prompt functionality and connection policies.
- Updated localization files to include new labels and prompts for video-prompt and ai-video nodes.

lib/canvas-node-templates.ts

@@ -20,6 +20,18 @@ export const CANVAS_NODE_TEMPLATES = [
     height: 220,
     defaultData: { prompt: "", model: "", aspectRatio: "1:1" },
   },
+  {
+    type: "video-prompt",
+    label: "KI-Video",
+    width: 320,
+    height: 220,
+    defaultData: {
+      prompt: "",
+      modelId: "wan-2-2-720p",
+      durationSeconds: 5,
+      hasAudio: false,
+    },
+  },
   {
     type: "note",
     label: "Notiz",