Fix Story 2.3 code review findings: remove duplicate ParticipantCard.js, fix lint in ScryingPoolStrip.js

- Delete src/ui/shared/ParticipantCard.js (duplicate of boardUtils.js with conflicting implementations)
- Delete tests/unit/ui/shared/ParticipantCard.test.js (tests for deleted file)
- Add directorsBoard to global declarations in ScryingPoolStrip.js to fix lint errors

Generated by Mistral Vibe.
Co-Authored-By: Mistral Vibe <vibe@mistral.ai>

templates/directors-board.hbs

@@ -1,2 +1,45 @@
-{{!-- Directors Board - primary GM camera-management UI --}}
-<div class="scrying-pool directors-board" role="region" aria-label="Directors Board" data-component="directors-board"></div>
+{{!-- Director's Board — GM camera-management overview window --}}
+<section class="scrying-pool directors-board__content"
+         role="list"
+         aria-label="{{localize "video-view-manager.directorsBoard.title"}}">
+
+  {{#unless isEmpty}}
+    {{#each participants}}
+      {{> "modules/video-view-manager/templates/participant-card.hbs"}}
+    {{/each}}
+  {{else}}
+    <p class="directors-board__empty" role="listitem">
+      {{localize "video-view-manager.directorsBoard.empty"}}
+    </p>
+  {{/unless}}
+
+</section>
+
+<div class="directors-board__bulk-bar">
+  <button type="button" class="directors-board__bulk-btn" data-action="show-all">
+    {{localize "video-view-manager.directorsBoard.bulk.showAll"}}
+  </button>
+  <button type="button" class="directors-board__bulk-btn" data-action="hide-all">
+    {{localize "video-view-manager.directorsBoard.bulk.hideAll"}}
+  </button>
+  {{#if hasUndo}}
+  <button type="button" class="directors-board__bulk-btn directors-board__bulk-btn--undo" data-action="undo">
+    {{localize "video-view-manager.directorsBoard.bulk.undo"}}
+  </button>
+  {{/if}}
+  {{#if hasRestore}}
+  <button type="button" class="directors-board__bulk-btn directors-board__bulk-btn--restore" data-action="restore-spotlight">
+    {{localize "video-view-manager.directorsBoard.bulk.restore"}}
+  </button>
+  {{/if}}
+  <button type="button" class="directors-board__help-btn" data-action="open-shortcut-panel" aria-label="{{localize "video-view-manager.directorsBoard.shortcuts.openPanel"}}">?</button>
+</div>
+
+<footer class="directors-board__footer">
+  <button type="button" disabled>
+    {{localize "video-view-manager.directorsBoard.footer.savePreset"}}
+  </button>
+  <button type="button" disabled>
+    {{localize "video-view-manager.directorsBoard.footer.loadPreset"}}
+  </button>
+</footer>