refactor(web): reuse stats-utils formatDuration in stats-sections (#2068)

Co-authored-by: Kandev Agent <agent@kandev.dev>
Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>

apps/web/app/stats/stats-sections.tsx

@@ -4,21 +4,7 @@ import { IconGitCommit } from "@tabler/icons-react";
 import { Card, CardContent, CardHeader, CardTitle } from "@kandev/ui/card";
 import { Tooltip, TooltipContent, TooltipTrigger } from "@kandev/ui/tooltip";
 import type { StatsResponse, TaskStatsDTO, RepositoryStatsDTO } from "@/lib/types/http";
-
-function formatDuration(ms: number): string {
-  if (ms === 0) return "\u2014";
-  const seconds = Math.floor(ms / 1000);
-  const minutes = Math.floor(seconds / 60);
-  const hours = Math.floor(minutes / 60);
-
-  if (hours > 0) {
-    return `${hours}h ${minutes % 60}m`;
-  }
-  if (minutes > 0) {
-    return `${minutes}m ${seconds % 60}s`;
-  }
-  return `${seconds}s`;
-}
+import { formatDuration } from "./stats-utils";
 
 function formatPercent(value: number): string {
   return `${Math.round(value)}%`;