feat(frontend): Add easteregg to dogfood (#28)

frontend/src/components/UsersLeaderboard.vue

@@ -1,4 +1,5 @@
 <script setup lang="ts">
+import { onMounted, onUnmounted } from 'vue';
 import { useUsersStore } from '@/stores/users';
 import { storeToRefs } from 'pinia';
 import * as confetti from 'canvas-confetti';
@@ -30,6 +31,26 @@ const onCountClick = (e: MouseEvent) => {
     },
   });
 };
+
+// Small little easter egg so we can dogfood:
+// If you type "taco" on the leaderboard page, an error is thrown.
+let lastFourKeystrokes: string[] = [];
+const recordKeystroke = (e: KeyboardEvent) => {
+  lastFourKeystrokes.push(e.key);
+  lastFourKeystrokes = lastFourKeystrokes.slice(-4);
+
+  if (lastFourKeystrokes.join('') === 'taco') {
+    throw new Error("We don't like Tacos!");
+  }
+};
+
+onMounted(() => {
+  window.addEventListener('keydown', recordKeystroke);
+});
+
+onUnmounted(() => {
+  window.removeEventListener('keydown', recordKeystroke);
+});
 </script>
 
 <template>