fix(anime): keep browser state in sync and alias HLS segments

- Toggle the player Anime Browser without losing its state
- Share active playback state and support rotating fake segment extensions

src/shared/anime-browser-embed.ts

@@ -0,0 +1,36 @@
+export const ANIME_BROWSER_CLOSE_MESSAGE = 'subminer:anime-browser-close';
+
+const ANIME_BROWSER_KEYDOWN_MESSAGE = 'subminer:anime-browser-keydown';
+
+export interface AnimeBrowserKeydownMessage {
+  type: typeof ANIME_BROWSER_KEYDOWN_MESSAGE;
+  bindingKey: string;
+  repeat: boolean;
+}
+
+export function createAnimeBrowserKeydownMessage(
+  event: Pick<KeyboardEvent, 'altKey' | 'code' | 'ctrlKey' | 'metaKey' | 'repeat' | 'shiftKey'>,
+): AnimeBrowserKeydownMessage {
+  const parts: string[] = [];
+  if (event.ctrlKey) parts.push('Ctrl');
+  if (event.altKey) parts.push('Alt');
+  if (event.shiftKey) parts.push('Shift');
+  if (event.metaKey) parts.push('Meta');
+  parts.push(event.code);
+  return {
+    type: ANIME_BROWSER_KEYDOWN_MESSAGE,
+    bindingKey: parts.join('+'),
+    repeat: event.repeat,
+  };
+}
+
+export function isAnimeBrowserKeydownMessage(value: unknown): value is AnimeBrowserKeydownMessage {
+  if (!value || typeof value !== 'object') return false;
+  const message = value as Partial<AnimeBrowserKeydownMessage>;
+  return (
+    message.type === ANIME_BROWSER_KEYDOWN_MESSAGE &&
+    typeof message.bindingKey === 'string' &&
+    message.bindingKey.length > 0 &&
+    typeof message.repeat === 'boolean'
+  );
+}