fix ScreensharePicker ui & modernise all UI

src/renderer/components/screenSharePicker.css

@@ -81,13 +81,13 @@
 /* Option Radios */
 
 .vcd-screen-picker-option-radios {
-    display: flex;
+    display: grid;
+    grid-template-columns: repeat(auto-fit, minmax(0, 1fr));
     width: 100%;
     border-radius: 3px;
 }
 
 .vcd-screen-picker-option-radio {
-    flex: 1 1 auto;
     text-align: center;
     background-color: var(--background-secondary);
     border: 1px solid var(--primary-800);