diff --git a/src/main/ipc.ts b/src/main/ipc.ts
index df8c1f2..99a3c19 100644
--- a/src/main/ipc.ts
+++ b/src/main/ipc.ts
@@ -352,12 +352,16 @@ export function registerIpc(): void {
       defaultPath,
       filters: [{ name: 'JSON', extensions: ['json'] }]
     })
-    if (result.canceled || !result.filePath) return { ok: false, path: null }
+    // Cancel — это не ошибка. Возвращаем canceled=true чтобы UI мог
+    // ничего не показывать (без error toast).
+    if (result.canceled || !result.filePath) {
+      return { ok: false, canceled: true, path: null }
+    }
     try {
       writeFileSync(result.filePath, exportState(), 'utf-8')
-      return { ok: true, path: result.filePath }
+      return { ok: true, canceled: false, path: result.filePath }
     } catch (e) {
-      return { ok: false, path: null, error: String(e) }
+      return { ok: false, canceled: false, path: null, error: String(e) }
     }
   })
 
@@ -369,7 +373,7 @@ export function registerIpc(): void {
       filters: [{ name: 'JSON', extensions: ['json'] }]
     })
     if (result.canceled || result.filePaths.length === 0) {
-      return { ok: false }
+      return { ok: false, canceled: true }
     }
     try {
       const raw = readFileSync(result.filePaths[0], 'utf-8')
@@ -378,9 +382,9 @@ export function registerIpc(): void {
         broadcastState()
         broadcastHistoryChanged()
       }
-      return { ok }
+      return { ok, canceled: false }
     } catch (e) {
-      return { ok: false, error: String(e) }
+      return { ok: false, canceled: false, error: String(e) }
     }
   })
 }
diff --git a/src/main/validate.test.ts b/src/main/validate.test.ts
index 41f7ade..0a3a326 100644
--- a/src/main/validate.test.ts
+++ b/src/main/validate.test.ts
@@ -266,6 +266,65 @@ describe('validateSettingsPatch', () => {
     expect(validateSettingsPatch({ snoozeMinutes: -5 })).toBeNull()
   })
 
+  it('accepts voicePromptsEnabled boolean', () => {
+    expect(validateSettingsPatch({ voicePromptsEnabled: true })).toEqual({
+      voicePromptsEnabled: true
+    })
+    expect(validateSettingsPatch({ voicePromptsEnabled: false })).toEqual({
+      voicePromptsEnabled: false
+    })
+  })
+
+  it('rejects non-boolean voicePromptsEnabled in patch', () => {
+    expect(validateSettingsPatch({ voicePromptsEnabled: 'yes' })).toBeNull()
+    expect(validateSettingsPatch({ voicePromptsEnabled: 1 })).toBeNull()
+  })
+
+  it('accepts meetingAutoPause boolean', () => {
+    expect(validateSettingsPatch({ meetingAutoPause: true })).toEqual({
+      meetingAutoPause: true
+    })
+  })
+
+  it('rejects non-boolean meetingAutoPause', () => {
+    expect(validateSettingsPatch({ meetingAutoPause: 'yes' })).toBeNull()
+  })
+
+  describe('lastSeenVersion', () => {
+    it('accepts valid semver', () => {
+      const r = validateSettingsPatch({ lastSeenVersion: '0.5.7' })
+      expect(r?.lastSeenVersion).toBe('0.5.7')
+      expect(validateSettingsPatch({ lastSeenVersion: '10.20.30' })).toEqual({
+        lastSeenVersion: '10.20.30'
+      })
+    })
+
+    it('accepts pre-release suffix', () => {
+      const r = validateSettingsPatch({ lastSeenVersion: '0.5.7-beta.1' })
+      expect(r?.lastSeenVersion).toBe('0.5.7-beta.1')
+    })
+
+    it('treats null/undefined as reset to undefined', () => {
+      const r1 = validateSettingsPatch({ lastSeenVersion: null })
+      expect(r1).toEqual({ lastSeenVersion: undefined })
+      const r2 = validateSettingsPatch({ lastSeenVersion: undefined })
+      // 'lastSeenVersion' is `in raw` even if undefined — both treated reset.
+      expect(r2).toEqual({ lastSeenVersion: undefined })
+    })
+
+    it('rejects malformed strings', () => {
+      expect(validateSettingsPatch({ lastSeenVersion: '0.5' })).toBeNull()
+      expect(validateSettingsPatch({ lastSeenVersion: 'v0.5.7' })).toBeNull()
+      expect(validateSettingsPatch({ lastSeenVersion: 'beta' })).toBeNull()
+      expect(validateSettingsPatch({ lastSeenVersion: '' })).toBeNull()
+    })
+
+    it('rejects non-strings', () => {
+      expect(validateSettingsPatch({ lastSeenVersion: 42 })).toBeNull()
+      expect(validateSettingsPatch({ lastSeenVersion: ['1', '0', '0'] })).toBeNull()
+    })
+  })
+
   describe('quietHours subobject', () => {
     const baseQh = {
       enabled: true,
diff --git a/src/preload/index.ts b/src/preload/index.ts
index 587e3da..1422656 100644
--- a/src/preload/index.ts
+++ b/src/preload/index.ts
@@ -122,10 +122,17 @@ const api = {
     ipcRenderer.invoke(IPC.clearHistory, beforeTs),
 
   // Export / Import — открывают native save/open dialogs из main process.
-  exportState: (): Promise<{ ok: boolean; path: string | null }> =>
-    ipcRenderer.invoke(IPC.exportState),
-  importState: (): Promise<{ ok: boolean; error?: string }> =>
-    ipcRenderer.invoke(IPC.importState),
+  exportState: (): Promise<{
+    ok: boolean
+    canceled: boolean
+    path: string | null
+    error?: string
+  }> => ipcRenderer.invoke(IPC.exportState),
+  importState: (): Promise<{
+    ok: boolean
+    canceled: boolean
+    error?: string
+  }> => ipcRenderer.invoke(IPC.importState),
 
   onTick: (h: Handler<Tick[]>): Unsub => on(IPC.evtTick, h),
   onFire: (h: Handler<Exercise>): Unsub => on(IPC.evtFire, h),
diff --git a/src/renderer/src/pages/Settings.tsx b/src/renderer/src/pages/Settings.tsx
index 26b77ed..4150227 100644
--- a/src/renderer/src/pages/Settings.tsx
+++ b/src/renderer/src/pages/Settings.tsx
@@ -261,7 +261,8 @@ function DataCard(): JSX.Element {
       const r = await window.api.exportState()
       if (r.ok && r.path) {
         setToast(t('settings.data.export.ok', { path: r.path }))
-      } else if (!r.ok) {
+      } else if (!r.ok && !r.canceled) {
+        // canceled — пользователь сам передумал, тост не нужен.
         setToast(t('settings.data.export.err'))
       }
     } finally {
@@ -275,7 +276,8 @@ function DataCard(): JSX.Element {
     try {
       const r = await window.api.importState()
       if (r.ok) setToast(t('settings.data.import.ok'))
-      else if ('error' in r && r.error !== undefined) {
+      else if (!r.canceled) {
+        // canceled — пользователь не выбрал файл, не показываем error.
         setToast(t('settings.data.import.err'))
       }
     } finally {