FEAT: darkmode (#155)

* darkmode fixes

* fix: darkmode: empty beats in active/ hovered state

* fix: color for empty beats

* fix: navbar background color

* Update src/assets/vars.scss

Co-authored-by: Adam Stachowicz <saibamenppl@gmail.com>

* Update src/assets/app.scss

Co-authored-by: Adam Stachowicz <saibamenppl@gmail.com>

* wip, split dark theme style by .dark and store light theme to normal

* add back missing css

* working switch theme button and tuning dark theme

* finish dark theme

Co-authored-by: Adam Stachowicz <saibamenppl@gmail.com>
Co-authored-by: LouisLam <louislam@users.noreply.github.com>

src/mixins/socket.js

@@ -29,7 +29,7 @@ export default {
             notificationList: [],
             windowWidth: window.innerWidth,
             showListMobile: false,
-            connectionErrorMsg: "Cannot connect to the socket server. Reconnecting..."
+            connectionErrorMsg: "Cannot connect to the socket server. Reconnecting...",
         }
     },