Add showing and modifying user name (#306)

Make sure to use the user name field everywhere

Add showing and modifying user name

Co-authored-by: kolaente <k@knt.li>
Reviewed-on: https://kolaente.dev/vikunja/frontend/pulls/306
Co-Authored-By: konrad <konrad@kola-entertainments.de>
Co-Committed-By: konrad <konrad@kola-entertainments.de>

src/store/modules/auth.js

@@ -16,6 +16,9 @@ export default {
 			state.info = info
 			state.avatarUrl = info.getAvatarUrl()
 		},
+		setUserName(state, name) {
+			state.info.name = name
+		},
 		authenticated(state, authenticated) {
 			state.authenticated = authenticated
 		},