refactor: improve maintainability by reducing LOC/reuse

apps/web/src/utils/rate-limit.ts

@@ -1,21 +0,0 @@
-export function createRateLimiter(windowMs = 60_000, cleanupIntervalMs = 5 * 60_000) {
-  const map = new Map<string, { count: number; resetAt: number }>();
-
-  setInterval(() => {
-    const now = Date.now();
-    for (const [key, entry] of map) {
-      if (now > entry.resetAt) map.delete(key);
-    }
-  }, cleanupIntervalMs);
-
-  return function check(key: string, max: number): boolean {
-    const now = Date.now();
-    const entry = map.get(key);
-    if (!entry || now > entry.resetAt) {
-      map.set(key, { count: 1, resetAt: now + windowMs });
-      return true;
-    }
-    entry.count++;
-    return entry.count <= max;
-  };
-}

apps/web/src/utils/sparkline.ts

@@ -12,10 +12,7 @@ export function sparkline(values: number[], width = 120, height = 32, color = '#
   return `<svg width="${width}" height="${height}" class="inline-block" data-vals="${values.join(',')}" data-region="${region}"><polyline points="${points}" fill="none" stroke="${color}" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round"/></svg>`;
 }
 
-const REGION_COLORS: Record<string, string> = {
-  'eu-central': '#3b82f6',
-  'us-west':    '#f59e0b',
-};
+import { REGION_COLORS } from "../../../shared/plans";
 
 // Pick the best region: the one with the lowest avg latency across its last 3 pings.
 // Only considers regions that have at least one ping in the most recent 3 pings overall,