Fit view to bounds (#1474)

* fit view:
- fit view to canvas selection
- fit view to whole graph when nothing is selected
- add button to graph canvas menu
- assign default keybinding '.'

* Adjust on changed APIs

* Update litegraph

---------

Co-authored-by: huchenlei <huchenlei@proton.me>

src/stores/commandStore.ts

@@ -292,6 +292,12 @@ export const useCommandStore = defineStore('command', () => {
         app.canvas.setDirty(true, true)
       }
     },
+    {
+      id: 'Comfy.Canvas.FitView',
+      icon: 'pi pi-expand',
+      label: 'Fit view to selected nodes',
+      function: () => app.canvas.fitViewToSelectionAnimated()
+    },
     {
       id: 'Comfy.Canvas.ToggleLock',
       icon: 'pi pi-lock',