Import source: src/context/HistoryContext

Import the existing local project snapshot. This commit organizes existing files; it does not represent newly developed functionality.

src/context/HistoryContext.tsx

@@ -0,0 +1,65 @@
+import { createContext, useContext, useState, useCallback, type ReactNode } from 'react';
+import type { QRState } from '../types';
+
+export interface HistoryEntry {
+  id: number;
+  type: QRState['selectedType'];
+  label: string;
+  snapshot: Pick<QRState, 'qrColor' | 'bgColor' | 'pattern' | 'theme' | 'gradientEnabled' | 'gradientColor2' | 'cornerSquareStyle' | 'cornerDotStyle' | 'logoDataUrl'>;
+  formData: QRState['formData'];
+  savedAt: number;
+}
+
+interface HistoryCtx {
+  history: HistoryEntry[];
+  push: (state: QRState, label: string) => void;
+  remove: (id: number) => void;
+  clear: () => void;
+}
+
+const KEY = 'cqrc_history';
+const MAX = 20;
+
+function load(): HistoryEntry[] {
+  try { return JSON.parse(localStorage.getItem(KEY) ?? '[]'); } catch { return []; }
+}
+function save(h: HistoryEntry[]) {
+  try { localStorage.setItem(KEY, JSON.stringify(h)); } catch { /* storage full */ }
+}
+
+const HistoryContext = createContext<HistoryCtx>({ history: [], push: () => {}, remove: () => {}, clear: () => {} });
+
+export function HistoryProvider({ children }: { children: ReactNode }) {
+  const [history, setHistory] = useState<HistoryEntry[]>(load);
+
+  const push = useCallback((state: QRState, label: string) => {
+    setHistory(prev => {
+      const entry: HistoryEntry = {
+        id: Date.now(),
+        type: state.selectedType,
+        label: label.slice(0, 60),
+        snapshot: {
+          qrColor: state.qrColor, bgColor: state.bgColor, pattern: state.pattern,
+          theme: state.theme, gradientEnabled: state.gradientEnabled,
+          gradientColor2: state.gradientColor2, cornerSquareStyle: state.cornerSquareStyle,
+          cornerDotStyle: state.cornerDotStyle, logoDataUrl: state.logoDataUrl,
+        },
+        formData: state.formData,
+        savedAt: Date.now(),
+      };
+      const next = [entry, ...prev.filter(e => e.label !== label)].slice(0, MAX);
+      save(next);
+      return next;
+    });
+  }, []);
+
+  const remove = useCallback((id: number) => {
+    setHistory(prev => { const next = prev.filter(e => e.id !== id); save(next); return next; });
+  }, []);
+
+  const clear = useCallback(() => { setHistory([]); localStorage.removeItem(KEY); }, []);
+
+  return <HistoryContext.Provider value={{ history, push, remove, clear }}>{children}</HistoryContext.Provider>;
+}
+
+export const useHistory = () => useContext(HistoryContext);