feat(dashboard): keep throughput cards up to date

Refresh project dashboard data every 60 seconds so 24h throughput and health stats stay current even without new events.

closes #7

src/components/projects/ProjectDashboard.tsx

@@ -1,5 +1,5 @@
 import { listen } from "@tauri-apps/api/event";
-import { useEffect, useState } from "react";
+import { useCallback, useEffect, useState } from "react";
 import { useParams, Link, useNavigate } from "react-router-dom";
 import {
   getProject,
@@ -67,7 +67,7 @@ export default function ProjectDashboard() {
     setActivity((prev) => [item, ...prev].slice(0, 30));
   }
 
-  async function loadData() {
+  const loadData = useCallback(async () => {
     if (!projectId) return;
     const [proj, trks, tkts, stats] = await Promise.all([
       getProject(projectId),
@@ -79,11 +79,21 @@ export default function ProjectDashboard() {
     setTrackers(trks);
     setTickets(tkts);
     setThroughput(stats);
-  }
+  }, [projectId]);
 
   useEffect(() => {
-    loadData();
+    void loadData();
-  }, [projectId]);
+  }, [loadData]);
+
+  useEffect(() => {
+    if (!projectId) return;
+
+    const intervalId = window.setInterval(() => {
+      void loadData();
+    }, 60_000);
+
+    return () => window.clearInterval(intervalId);
+  }, [projectId, loadData]);
 
   useEffect(() => {
     if (!projectId) return;