🚸(frontend) enhance mic indicator in participant list

The Gmeet-inspired indicator was misleading for users,
at least those not used to GSuite products.

They didn't understand how to mute a participant.

Plus, having the button disabled for the local participant,
was creating confusion. To simplify the UX, have all
the buttons enabled is simpler to understand.

Empirical observations with a few number of users, should be
enhance and challenge in the long run.

src/frontend/panda.config.ts

@@ -81,6 +81,11 @@ const config: Config = {
         '80%': { transform: 'rotate(20deg)' },
         '100%': { transform: 'rotate(0)' },
       },
+      pulse_mic: {
+        '0%': { color: 'primary', opacity: '1' },
+        '50%': { color: 'primary', opacity: '0.8' },
+        '100%': { color: 'primary', opacity: '1' },
+      },
     },
     tokens: defineTokens({
       /* we take a few things from the panda preset but for now we clear out some stuff.