refactor: countdown view redesign

- allow selecting multiple events
- follow selected
- remove past events

apps/client/src/common/components/buttons/Button.module.scss

@@ -1,12 +1,13 @@
 @use '../../../theme/viewerDefs' as *;
 
 .baseButton {
-  height: 2rem;
-  padding-inline: 1em;
   display: flex;
   align-items: center;
   gap: 0.5em;
 
+  width: fit-content;
+  padding-inline: 1em;
+
   border: 1px solid transparent;
   border-radius: 3px;
 
@@ -50,3 +51,11 @@
     opacity: $viewer-opacity-disabled;
   }
 }
+
+.medium {
+  height: 2rem;
+}
+
+.large {
+  height: 3.5rem;
+}