add filename in model preview popup (#1005)

* add filename in model preview popup

for #1003

* user setting for model name fomat in the tree

* add a tooltip for the setting to explain what things mean

* more explicit file_name naming

* touch of additional text in the tooltip

src/components/graph/GraphCanvas.vue

@@ -171,7 +171,7 @@ onMounted(async () => {
               (widget) => widget.name === provider.key
             )
             if (widget) {
-              widget.value = model.name
+              widget.value = model.file_name
             }
           }
         }