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.

components/canvas/canvas-node-template-picker.tsx

@@ -27,6 +27,7 @@ const NODE_ICONS: Record<CanvasNodeTemplate["type"], LucideIcon> = {
   image: Image,
   text: Type,
   prompt: Sparkles,
+  "video-prompt": Video,
   note: StickyNote,
   frame: Frame,
   compare: GitCompare,
@@ -46,6 +47,7 @@ const NODE_SEARCH_KEYWORDS: Partial<
   image: ["image", "photo", "foto"],
   text: ["text", "typo"],
   prompt: ["prompt", "ai", "generate", "ki-bild", "ki", "bild"],
+  "video-prompt": ["video", "ai", "ki-video", "ki", "prompt"],
   note: ["note", "sticky", "notiz"],
   frame: ["frame", "artboard"],
   compare: ["compare", "before", "after", "vergleich"],