fix(anime): harden browser playback and modal lifecycle

- Abort upstream fetches when clients disconnect
- Validate embedded modal readiness before opening
- Centralize browser IPC and window lifecycle

src/main/runtime/anime-browser-ipc-handlers.test.ts

@@ -0,0 +1,31 @@
+import assert from 'node:assert/strict';
+import test from 'node:test';
+import { IPC_CHANNELS } from '../../shared/ipc/contracts';
+import { registerAnimeBrowserIpcHandlers } from './anime-browser-ipc-handlers';
+
+test('anime browser preference IPC coerces values at the renderer boundary', () => {
+  const handlers = new Map<string, (event: unknown, ...args: unknown[]) => unknown>();
+  const received: unknown[][] = [];
+  registerAnimeBrowserIpcHandlers({
+    ipcMain: {
+      handle: (channel, listener) => handlers.set(channel, listener),
+    },
+    runtime: {
+      setPreference: (...args: unknown[]) => received.push(args),
+    } as never,
+  });
+
+  const setPreference = handlers.get(IPC_CHANNELS.request.animeBrowserSetPreference);
+  assert.ok(setPreference);
+  setPreference({}, 'source', 'text', 'value');
+  setPreference({}, 'source', 'enabled', true);
+  setPreference({}, 'source', 'choices', ['one', 2, false, 'two']);
+  setPreference({}, 'source', 'invalid', { nested: 'value' });
+
+  assert.deepEqual(received, [
+    ['source', 'text', 'value'],
+    ['source', 'enabled', true],
+    ['source', 'choices', ['one', 'two']],
+    ['source', 'invalid', ''],
+  ]);
+});