refactor: Replace react-hotkeys with custom hook (#35425)

app/javascript/mastodon/components/hotkeys/utils.ts

@@ -0,0 +1,29 @@
+export function isKeyboardEvent(event: Event): event is KeyboardEvent {
+  return 'key' in event;
+}
+
+export function normalizeKey(key: string): string {
+  const lowerKey = key.toLowerCase();
+
+  switch (lowerKey) {
+    case ' ':
+    case 'spacebar': // for older browsers
+      return 'space';
+
+    case 'arrowup':
+      return 'up';
+    case 'arrowdown':
+      return 'down';
+    case 'arrowleft':
+      return 'left';
+    case 'arrowright':
+      return 'right';
+
+    case 'esc':
+    case 'escape':
+      return 'escape';
+
+    default:
+      return lowerKey;
+  }
+}