feat: add Video Input to floating action bar and all nodes menu

Adds a top-level "Video" quick-access button to the floating action bar
and adds videoInput to the Input category in the All Nodes menu. Fixes
test selectors to disambiguate the new top-level Video button from the
Generate dropdown's Video option.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/components/FloatingActionBar.tsx

@@ -14,6 +14,7 @@ const ALL_NODES_CATEGORIES: { label: string; nodes: { type: NodeType; label: str
     nodes: [
       { type: "imageInput", label: "Image Input" },
       { type: "audioInput", label: "Audio Input" },
+      { type: "videoInput", label: "Video Input" },
       { type: "glbViewer", label: "3D Viewer" },
     ],
   },
@@ -416,6 +417,7 @@ export function FloatingActionBar() {
     <div className="fixed bottom-5 left-1/2 -translate-x-1/2 z-50">
       <div className="flex items-center gap-0.5 bg-neutral-800/95 rounded-lg shadow-lg border border-neutral-700/80 px-1.5 py-1">
         <NodeButton type="imageInput" label="Image" />
+        <NodeButton type="videoInput" label="Video" />
         <NodeButton type="prompt" label="Prompt" />
         <GenerateComboButton />
         <NodeButton type="output" label="Output" />

src/components/__tests__/FloatingActionBar.test.tsx

@@ -284,7 +284,7 @@ describe("FloatingActionBar", () => {
 
       // Dropdown menu items should appear
       expect(screen.getByText("Image", { selector: "button.w-full" })).toBeInTheDocument();
-      expect(screen.getByText("Video")).toBeInTheDocument();
+      expect(screen.getByText("Video", { selector: "button.w-full" })).toBeInTheDocument();
       expect(screen.getByText("Text (LLM)")).toBeInTheDocument();
     });
 
@@ -321,7 +321,7 @@ describe("FloatingActionBar", () => {
       });
 
       fireEvent.click(screen.getByText("Generate"));
-      fireEvent.click(screen.getByText("Video"));
+      fireEvent.click(screen.getByText("Video", { selector: "button.w-full" }));
 
       expect(mockAddNode).toHaveBeenCalledWith("generateVideo", expect.any(Object));
     });
@@ -357,13 +357,13 @@ describe("FloatingActionBar", () => {
       fireEvent.click(screen.getByText("Generate"));
 
       // Verify dropdown is open
-      expect(screen.getByText("Video")).toBeInTheDocument();
+      expect(screen.getByText("Video", { selector: "button.w-full" })).toBeInTheDocument();
 
       // Click an option
-      fireEvent.click(screen.getByText("Video"));
+      fireEvent.click(screen.getByText("Video", { selector: "button.w-full" }));
 
       // Dropdown should close
-      expect(screen.queryByText("Video")).not.toBeInTheDocument();
+      expect(screen.queryByText("Video", { selector: "button.w-full" })).not.toBeInTheDocument();
     });
   });