✨(frontend) create a reusable active speaker component

oupsy, heavily copied from Gmeet.
Thx Nathan Vasse for his css animation skills, he crushed it.

This component will be core in the app, and reused in many places.
It was necessary for the participants list.

src/frontend/panda.config.ts

@@ -63,6 +63,18 @@ const config: Config = {
         '75%': { boxShadow: '0 0 0 30px rgba(255, 255, 255, 0)' },
         '100%': { boxShadow: '0 0 0 0 rgba(255, 255, 255, 0)' },
       },
+      active_speaker: {
+        '0%': { height: '4px' },
+        '25%': { height: '8px' },
+        '50%': { height: '6px' },
+        '100%': { height: '16px' },
+      },
+      active_speake_small: {
+        '0%': { height: '4px' },
+        '25%': { height: '6px' },
+        '50%': { height: '4px' },
+        '100%': { height: '8px' },
+      },
     },
     tokens: defineTokens({
       /* we take a few things from the panda preset but for now we clear out some stuff.

src/frontend/src/features/rooms/components/ActiveSpeaker.tsx

@@ -0,0 +1,70 @@
+import { styled } from '@/styled-system/jsx'
+
+const StyledContainer = styled('div', {
+  base: {
+    width: '24px',
+    height: '24px',
+    boxSizing: 'border-box',
+    backgroundColor: 'primary',
+    borderRadius: '100%',
+    display: 'flex',
+    alignItems: 'center',
+    justifyContent: 'center',
+    gap: '2px',
+  },
+})
+
+const StyledChild = styled('div', {
+  base: {
+    backgroundColor: 'white',
+    width: '4px',
+    height: '4px',
+    borderRadius: '4px',
+    animationDuration: '400ms',
+    animationName: 'active_speaker',
+    animationIterationCount: 'infinite',
+    animationDirection: 'alternate',
+  },
+  variants: {
+    active: {
+      true: {
+        animationIterationCount: 'infinite',
+      },
+      false: {
+        animationIterationCount: 0,
+      },
+    },
+    size: {
+      small: {
+        animationName: 'active_speake_small',
+      },
+    },
+  },
+})
+
+export const ActiveSpeaker = ({ isSpeaking }: { isSpeaking: boolean }) => {
+  return (
+    <StyledContainer>
+      <StyledChild
+        active={isSpeaking}
+        size="small"
+        style={{
+          animationDelay: '300ms',
+        }}
+      />
+      <StyledChild
+        active={isSpeaking}
+        style={{
+          animationDelay: '100ms',
+        }}
+      />
+      <StyledChild
+        active={isSpeaking}
+        size="small"
+        style={{
+          animationDelay: '500ms',
+        }}
+      />
+    </StyledContainer>
+  )
+}