feat: enhance canvas functionality with scissors mode and node template updates

- Implemented visual feedback and cursor changes for scissors mode in dark and light themes, improving user interaction during edge manipulation.
- Updated node template picker to include new keywords for AI image generation, enhancing searchability.
- Renamed and categorized node types for clarity, including updates to asset and prompt nodes.
- Added support for video nodes and adjusted related components for improved media handling on the canvas.

public/cursors/scissors-cursor-light-canvas.svg

@@ -0,0 +1,23 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="32" height="32" viewBox="0 0 24 24" aria-hidden="true">
+  <!-- Lucide scissors-line-dashed, rotated -90deg; dark strokes for light canvas -->
+  <g transform="rotate(-90 12 12)" fill="none" stroke-linecap="round" stroke-linejoin="round">
+    <g stroke="rgba(24,24,27,0.55)" stroke-width="2.85" opacity="0.95">
+      <path d="M5.42 9.42 8 12"/>
+      <circle cx="4" cy="8" r="2" fill="none"/>
+      <path d="m14 6-8.58 8.58"/>
+      <circle cx="4" cy="16" r="2" fill="none"/>
+      <path d="M10.8 14.8 14 18"/>
+      <path d="M16 12h-2"/>
+      <path d="M22 12h-2"/>
+    </g>
+    <g stroke="#27272a" stroke-width="1.08">
+      <path d="M5.42 9.42 8 12"/>
+      <circle cx="4" cy="8" r="2" fill="none"/>
+      <path d="m14 6-8.58 8.58"/>
+      <circle cx="4" cy="16" r="2" fill="none"/>
+      <path d="M10.8 14.8 14 18"/>
+      <path d="M16 12h-2"/>
+      <path d="M22 12h-2"/>
+    </g>
+  </g>
+</svg>