diff --git a/frontend/src/App.vue b/frontend/src/App.vue
index d3b6227..fd1e714 100644
--- a/frontend/src/App.vue
+++ b/frontend/src/App.vue
@@ -12,6 +12,7 @@ const auth = useAuthStore()
 const { showError } = useEnhancedToast()
 
 const globalErrorHandler = (error: unknown) => {
+  if (error && typeof error === 'object' && 'silent' in error && error.silent) return
   showError(error)
 }
 
diff --git a/frontend/src/shared/components/layout/SyncStatusButton.spec.ts b/frontend/src/shared/components/layout/SyncStatusButton.spec.ts
new file mode 100644
index 0000000..dbf40e0
--- /dev/null
+++ b/frontend/src/shared/components/layout/SyncStatusButton.spec.ts
@@ -0,0 +1,110 @@
+import { describe, it, expect, vi, beforeEach, type Mock } from 'vitest'
+import { mount } from '@vue/test-utils'
+import SyncStatusButton from './SyncStatusButton.vue'
+import { useIsFetching, useQueryClient } from '@tanstack/vue-query'
+import { useEnhancedToast } from '@/shared/composables/useEnhancedToast'
+
+// Mock TanStack Query
+vi.mock('@tanstack/vue-query', () => ({
+  useIsFetching: vi.fn(),
+  useQueryClient: vi.fn(),
+}))
+
+// Mock Enhanced Toast
+vi.mock('@/shared/composables/useEnhancedToast', () => ({
+  useEnhancedToast: vi.fn(),
+}))
+
+// Mock Iconify
+vi.mock('@iconify/vue', () => ({
+  Icon: { template: '<span>icon</span>' },
+}))
+
+describe('SyncStatusButton', () => {
+  let mockQueryClient: { invalidateQueries: Mock }
+  let mockShowSuccess: Mock
+  let mockShowError: Mock
+
+  beforeEach(() => {
+    vi.clearAllMocks()
+
+    mockQueryClient = {
+      invalidateQueries: vi.fn().mockResolvedValue(undefined),
+    }
+    ;(useQueryClient as Mock).mockReturnValue(mockQueryClient)
+    ;(useIsFetching as Mock).mockReturnValue({ value: 0 })
+
+    mockShowSuccess = vi.fn()
+    mockShowError = vi.fn()
+    ;(useEnhancedToast as Mock).mockReturnValue({
+      showSuccess: mockShowSuccess,
+      showError: mockShowError,
+    })
+
+    // Silence console during tests if needed
+    vi.spyOn(console, 'error').mockImplementation(() => {})
+  })
+
+  it('should call invalidateQueries and show success toast on click', async () => {
+    vi.useFakeTimers()
+    const wrapper = mount(SyncStatusButton, {
+      global: {
+        stubs: {
+          TooltipProvider: { template: '<div><slot /></div>' },
+          Tooltip: { template: '<div><slot /></div>' },
+          TooltipTrigger: { template: '<div><slot /></div>' },
+          TooltipContent: { template: '<div><slot /></div>' },
+          Button: {
+            template: '<button @click="$emit(\'click\')"><slot /></button>',
+            props: ['disabled'],
+          },
+        },
+      },
+    })
+
+    const button = wrapper.find('button')
+    await button.trigger('click')
+
+    // After click, it should have started invalidation
+    expect(mockQueryClient.invalidateQueries).toHaveBeenCalled()
+
+    // Wait for the minimum duration (600ms)
+    await vi.advanceTimersByTimeAsync(600)
+
+    expect(mockShowSuccess).toHaveBeenCalledWith(
+      'Data synchronized',
+      'All active data views have been updated.'
+    )
+    vi.useRealTimers()
+  })
+
+  it('should show error toast and mark error as silent on failure', async () => {
+    vi.useFakeTimers()
+    const error = new Error('Sync failed')
+    mockQueryClient.invalidateQueries.mockRejectedValue(error)
+
+    const wrapper = mount(SyncStatusButton, {
+      global: {
+        stubs: {
+          TooltipProvider: { template: '<div><slot /></div>' },
+          Tooltip: { template: '<div><slot /></div>' },
+          TooltipTrigger: { template: '<div><slot /></div>' },
+          TooltipContent: { template: '<div><slot /></div>' },
+          Button: {
+            template: '<button @click="$emit(\'click\')"><slot /></button>',
+            props: ['disabled'],
+          },
+        },
+      },
+    })
+
+    const button = wrapper.find('button')
+    await button.trigger('click')
+
+    await vi.advanceTimersByTimeAsync(600)
+
+    expect(mockShowError).toHaveBeenCalledWith(error, 'Sync Failed')
+    expect((error as Error & { silent?: boolean }).silent).toBe(true)
+    vi.useRealTimers()
+  })
+})
diff --git a/frontend/src/shared/components/layout/SyncStatusButton.vue b/frontend/src/shared/components/layout/SyncStatusButton.vue
index 9141fbf..e271a8c 100644
--- a/frontend/src/shared/components/layout/SyncStatusButton.vue
+++ b/frontend/src/shared/components/layout/SyncStatusButton.vue
@@ -1,14 +1,43 @@
 <script setup lang="ts">
+import { ref, computed } from 'vue'
 import { useIsFetching, useQueryClient } from '@tanstack/vue-query'
 import { Icon } from '@iconify/vue'
 import { Button } from '@/shared/ui/button'
 import { Tooltip, TooltipContent, TooltipProvider, TooltipTrigger } from '@/shared/ui/tooltip'
+import { useEnhancedToast } from '@/shared/composables/useEnhancedToast'
 
 const isFetching = useIsFetching()
 const queryClient = useQueryClient()
+const { showSuccess, showError } = useEnhancedToast()
 
-const handleRefresh = () => {
-  queryClient.invalidateQueries()
+const isSyncing = ref(false)
+
+// Combine TanStack's background fetching with our artificial minimum duration
+const isRefreshing = computed(() => isSyncing.value || isFetching.value > 0)
+
+const handleRefresh = async () => {
+  if (isSyncing.value) return
+
+  isSyncing.value = true
+
+  try {
+    // We wrap invalidateQueries in a Promise.all with a minimum timeout
+    // to ensure the UI animation feels deliberate and smooth (no "blinks")
+    await Promise.all([
+      queryClient.invalidateQueries(),
+      new Promise(resolve => setTimeout(resolve, 600)),
+    ])
+
+    showSuccess('Data synchronized', 'All active data views have been updated.')
+  } catch (error) {
+    // Mark as silent to prevent App.vue's global handler from showing a duplicate toast
+    if (error && typeof error === 'object') {
+      ;(error as { silent?: boolean }).silent = true
+    }
+    showError(error, 'Sync Failed')
+  } finally {
+    isSyncing.value = false
+  }
 }
 </script>
 
@@ -20,16 +49,19 @@ const handleRefresh = () => {
           variant="ghost"
           size="icon"
           class="h-8 w-8"
-          :disabled="isFetching > 0"
+          :disabled="isRefreshing"
           @click="handleRefresh"
         >
-          <Icon v-if="isFetching > 0" icon="radix-icons:update" class="h-4 w-4 animate-spin" />
-          <Icon v-else icon="radix-icons:update" class="h-4 w-4" />
+          <Icon
+            icon="radix-icons:update"
+            class="h-4 w-4"
+            :class="{ 'animate-spin': isRefreshing }"
+          />
           <span class="sr-only">Refresh data</span>
         </Button>
       </TooltipTrigger>
       <TooltipContent>
-        <p>{{ isFetching > 0 ? 'Syncing data...' : 'Refresh all data' }}</p>
+        <p>{{ isRefreshing ? 'Syncing data...' : 'Refresh all data' }}</p>
       </TooltipContent>
     </Tooltip>
   </TooltipProvider>