feat(#9): export/import состояния — backup в JSON и восстановление

src/main/ipc.ts

@@ -4,8 +4,10 @@ import {
   systemPreferences,
   BrowserWindow,
   app,
+  dialog,
   shell
 } from 'electron'
+import { readFileSync, writeFileSync } from 'node:fs'
 import { IPC } from '@shared/ipc'
 import type { Exercise, GameId, Settings } from '@shared/types'
 import {
@@ -14,9 +16,11 @@ import {
   clearHistory,
   deleteChallenge,
   deleteExercise,
+  exportState,
   getHistory,
   getState,
   getStateForRenderer,
+  importState,
   markDone,
   setGameEnabled,
   skip,
@@ -304,4 +308,47 @@ export function registerIpc(): void {
   ipcMain.handle(IPC.clearHistory, (_e, beforeTs?: number) =>
     clearHistory(beforeTs)
   )
+
+  // Export / Import. Используем native save/open dialogs Electron'а —
+  // renderer не получает прямого доступа к ФС.
+  ipcMain.handle(IPC.exportState, async (event) => {
+    const win = BrowserWindow.fromWebContents(event.sender) ?? undefined
+    const stamp = new Date()
+      .toISOString()
+      .replace(/[:T]/g, '-')
+      .slice(0, 16)
+    const defaultPath = `laude-backup-${stamp}.json`
+    const result = await dialog.showSaveDialog(win!, {
+      title: 'Сохранить резервную копию',
+      defaultPath,
+      filters: [{ name: 'JSON', extensions: ['json'] }]
+    })
+    if (result.canceled || !result.filePath) return { ok: false, path: null }
+    try {
+      writeFileSync(result.filePath, exportState(), 'utf-8')
+      return { ok: true, path: result.filePath }
+    } catch (e) {
+      return { ok: false, path: null, error: String(e) }
+    }
+  })
+
+  ipcMain.handle(IPC.importState, async (event) => {
+    const win = BrowserWindow.fromWebContents(event.sender) ?? undefined
+    const result = await dialog.showOpenDialog(win!, {
+      title: 'Восстановить из резервной копии',
+      properties: ['openFile'],
+      filters: [{ name: 'JSON', extensions: ['json'] }]
+    })
+    if (result.canceled || result.filePaths.length === 0) {
+      return { ok: false }
+    }
+    try {
+      const raw = readFileSync(result.filePaths[0], 'utf-8')
+      const ok = importState(raw)
+      if (ok) broadcastState()
+      return { ok }
+    } catch (e) {
+      return { ok: false, error: String(e) }
+    }
+  })
 }