auto format on save for vsCode

this enables vscode to auto format files in the flutter project.
Also fixes a formatting error

enable formatting only for dart files


format settings.json

.gitignore

@@ -318,7 +318,7 @@ CMakeLists.txt.user*
 *.bak
 
 # visual studio code
-.vscode/
+#.vscode/
 
 # markdown temp files
 *.md.Html

src/ui/flutter_app/.gitignore

@@ -18,7 +18,7 @@
 # The .vscode folder contains launch configuration and tasks you configure in
 # VS Code which you may wish to be included in version control, so this line
 # is commented out by default.
-.vscode/
+#.vscode/
 
 # Visual Studio
 .vs/

src/ui/flutter_app/.vscode/settings.json

@@ -0,0 +1,5 @@
+{
+  "[dart]": {
+    "editor.formatOnSave": true
+  }
+}