GhiVideo 소스 복제 — v4 작업 시작 기준

기존 GhiVideo 저장소 HEAD의 트래킹 소스 362개 파일을 복제.
(node_modules·storage·빌드 산출물·대용량 미디어는 .gitignore 규칙대로 제외)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

client/src/store/annotationStore.ts

@@ -0,0 +1,25 @@
+import { create } from 'zustand';
+import type { Annotation } from '@abcvideo/shared';
+
+interface AnnotationStore {
+  annotations: Annotation[];
+  setAnnotations: (a: Annotation[]) => void;
+  addAnnotation: (a: Annotation) => void;
+  updateAnnotation: (id: string, a: Partial<Annotation>) => void;
+  removeAnnotation: (id: string) => void;
+}
+
+export const useAnnotationStore = create<AnnotationStore>((set) => ({
+  annotations: [],
+  setAnnotations: (annotations) => set({ annotations }),
+  addAnnotation: (annotation) =>
+    set((s) => ({
+      annotations: [...s.annotations, annotation].sort((a, b) => a.timeStart - b.timeStart),
+    })),
+  updateAnnotation: (id, update) =>
+    set((s) => ({
+      annotations: s.annotations.map((a) => (a.id === id ? { ...a, ...update } : a)),
+    })),
+  removeAnnotation: (id) =>
+    set((s) => ({ annotations: s.annotations.filter((a) => a.id !== id) })),
+}));