Add session memory, resize mode tabs, improved output summary

pixstrip-core/tests/storage_tests.rs

@@ -163,6 +163,7 @@ fn save_and_load_session() {
             window_width: Some(1024),
             window_height: Some(768),
             window_maximized: false,
+            ..Default::default()
         };
 
         session_store.save(&session).unwrap();