fix(overlay): treat Hachidori popup host as a lookup target for keys

- Match the Hachidori shadow-root host alongside the Yomitan popup host when routing keyboard events
- Update the keyboard test stub to use HACHIDORI_HOST_SELECTOR

src/renderer/handlers/keyboard.test.ts

@@ -5,7 +5,7 @@ import test from 'node:test';
 
 import { createKeyboardHandlers } from './keyboard.js';
 import { createRendererState } from '../state.js';
-import { YOMITAN_POPUP_HOST_SELECTOR } from '../yomitan-popup.js';
+import { HACHIDORI_HOST_SELECTOR } from '../yomitan-popup.js';
 import type { CompiledSessionBinding } from '../../types';
 import type { MpvInputBindingsSnapshot } from '../../types/session-bindings';
 import { DEFAULT_KEYBINDINGS, SPECIAL_COMMANDS } from '../../config/definitions';
@@ -482,7 +482,7 @@ function installKeyboardTestGlobals() {
         selector
           .split(',')
           .map((part) => part.trim())
-          .includes(YOMITAN_POPUP_HOST_SELECTOR)
+          .includes(HACHIDORI_HOST_SELECTOR)
           ? target
           : null;
       return target;

src/renderer/handlers/keyboard.ts

@@ -83,7 +83,7 @@ export function createKeyboardHandlers(
     if (ctx.dom.subtitleContainer.contains(target)) return true;
     if (isYomitanPopupIframe(target)) return true;
     // Hachidori's popup lives in a shadow root, so its events arrive retargeted to the host.
-    if (target.closest(YOMITAN_POPUP_HOST_SELECTOR)) return true;
+    if (target.closest(`${YOMITAN_POPUP_HOST_SELECTOR}, ${HACHIDORI_HOST_SELECTOR}`)) return true;
     if (target.closest && target.closest('iframe.yomitan-popup, iframe[id^="yomitan-popup"]'))
       return true;
     return false;