fix: Replace unsafe .toFixed() calls with safeFixed() in analytics views

- AnalyticsView: avg_players, uptime_percentage
- WipeAnalyticsView: success_rate, population curve, durations, CSV export
- PlayerRetentionView: retention percentages, session duration, tooltip
- MapAnalyticsView: rotation effectiveness, performance metrics, table

All analytics views now use safe formatter utilities with optional chaining
to prevent null/undefined runtime errors when displaying numeric data.

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

frontend/src/views/public/StatusPageView.vue

@@ -2,6 +2,7 @@
 import { ref, onMounted, onUnmounted, computed } from 'vue'
 import { Server, Users, Activity, TrendingUp, Search } from 'lucide-vue-next'
 import { useApi } from '@/composables/useApi'
+import { safeFixed } from '@/utils/formatters'
 
 interface ServerStatus {
   server_name: string
@@ -199,7 +200,7 @@ onUnmounted(() => {
               Platform Uptime
             </div>
             <p class="text-2xl font-bold text-neutral-100">
-              {{ platformHealth.uptime_percent.toFixed(1) }}%
+              {{ safeFixed(platformHealth.uptime_percent, 1) }}%
             </p>
           </div>
         </div>
@@ -297,15 +298,15 @@ onUnmounted(() => {
           <!-- Uptime Badges -->
           <div class="flex gap-2">
             <div :class="getUptimeBadgeColor(server.uptime_24h_percent)" class="flex-1 rounded-lg px-2 py-1.5 text-center">
-              <div class="text-xs font-medium">{{ server.uptime_24h_percent.toFixed(1) }}%</div>
+              <div class="text-xs font-medium">{{ safeFixed(server.uptime_24h_percent, 1) }}%</div>
               <div class="text-[10px] opacity-75">24h</div>
             </div>
             <div :class="getUptimeBadgeColor(server.uptime_7d_percent)" class="flex-1 rounded-lg px-2 py-1.5 text-center">
-              <div class="text-xs font-medium">{{ server.uptime_7d_percent.toFixed(1) }}%</div>
+              <div class="text-xs font-medium">{{ safeFixed(server.uptime_7d_percent, 1) }}%</div>
               <div class="text-[10px] opacity-75">7d</div>
             </div>
             <div :class="getUptimeBadgeColor(server.uptime_30d_percent)" class="flex-1 rounded-lg px-2 py-1.5 text-center">
-              <div class="text-xs font-medium">{{ server.uptime_30d_percent.toFixed(1) }}%</div>
+              <div class="text-xs font-medium">{{ safeFixed(server.uptime_30d_percent, 1) }}%</div>
               <div class="text-[10px] opacity-75">30d</div>
             </div>
           </div>

frontend/src/views/public/StoreView.vue

@@ -3,6 +3,7 @@ import { ref, computed, onMounted } from 'vue'
 import { useRoute } from 'vue-router'
 import type { PublicStoreInfo, PublicStoreItem, StorePurchaseRequest, StorePurchaseResponse } from '@/types'
 import { ShoppingCart, Package, Filter, X, AlertCircle, ExternalLink, Check } from 'lucide-vue-next'
+import { safeCurrency } from '@/utils/formatters'
 
 const route = useRoute()
 const subdomain = computed(() => route.params.subdomain as string)
@@ -138,7 +139,7 @@ async function confirmPurchase() {
 }
 
 function formatPrice(price: number): string {
-  return `$${price.toFixed(2)}`
+  return safeCurrency(price, '$')
 }
 
 function itemTypeBadgeClass(itemType: string): string {