Fix reports view showing error snackbar when no data exists

Wrap each report API call in a fetchReport helper that catches errors
individually and returns null, treating 4xx responses as empty data
instead of surfacing an error message to the user.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

frontend/src/views/reports/ReportsView.vue

@@ -457,42 +457,42 @@ const cashFlowChartOptions = computed(() => ({
 }))
 
 // --- Data loading ---
+async function fetchReport<T>(request: Promise<{ data: T }>): Promise<T | null> {
+  try {
+    const { data } = await request
+    return data
+  } catch (err: any) {
+    const status = err?.response?.status
+    if (status && status >= 500) {
+      console.error('Report request failed:', err)
+      return null
+    }
+    // 4xx (including 404) treated as no data
+    return null
+  }
+}
+
 async function loadReports() {
   loading.value = true
   const { startDate, endDate } = dateRange.value
 
-  try {
-    const results = await Promise.allSettled([
-      reportsApi.spendingByCategory(startDate, endDate, selectedAccountId.value),
-      reportsApi.incomeVsExpense(startDate, endDate),
-      reportsApi.netWorth(startDate, endDate),
-      reportsApi.cashFlow(startDate, endDate),
+  const [s, ie, nw, cf] = await Promise.all([
+    fetchReport(reportsApi.spendingByCategory(startDate, endDate, selectedAccountId.value)),
+    fetchReport(reportsApi.incomeVsExpense(startDate, endDate)),
+    fetchReport(reportsApi.netWorth(startDate, endDate)),
+    fetchReport(reportsApi.cashFlow(startDate, endDate)),
   ])
 
-    spending.value = results[0].status === 'fulfilled' ? results[0].value.data : null
-    incomeExpense.value = results[1].status === 'fulfilled' ? results[1].value.data : null
-    netWorth.value = results[2].status === 'fulfilled' ? results[2].value.data : null
-    cashFlow.value = results[3].status === 'fulfilled' ? results[3].value.data : null
-
-    const failed = results.filter(r => r.status === 'rejected')
-    if (failed.length > 0) {
-      showError('Some reports failed to load')
-    }
-  } catch {
-    showError('Failed to load reports')
-  } finally {
+  spending.value = s
+  incomeExpense.value = ie
+  netWorth.value = nw
+  cashFlow.value = cf
   loading.value = false
 }
-}
 
 async function loadSpending() {
   const { startDate, endDate } = dateRange.value
-  try {
-    const { data } = await reportsApi.spendingByCategory(startDate, endDate, selectedAccountId.value)
-    spending.value = data
-  } catch {
-    showError('Failed to load spending report')
-  }
+  spending.value = await fetchReport(reportsApi.spendingByCategory(startDate, endDate, selectedAccountId.value))
 }
 
 function showError(text: string) {