add changing db in schema pane

src/store/index.js

@@ -7,6 +7,7 @@ export default new Vuex.Store({
   state: {
     schema: null,
     dbFile: null,
+    dbName: null,
     worker: new Worker('/js/worker.sql-wasm.js')
   },
   mutations: {
@@ -15,6 +16,9 @@ export default new Vuex.Store({
     },
     saveDbFile (state, file) {
       state.dbFile = file
+    },
+    saveDbName (state, name) {
+      state.dbName = name
     }
   },
   actions: {