fix: SSE-driven chart/sparkline refresh, debounced server-side partials

apps/web/src/routes/dashboard.ts

@@ -196,5 +196,26 @@ export const dashboard = new Elysia()
     });
   })
 
+  // Sparkline partial — returns just the SVG for one monitor
+  .get("/dashboard/monitors/:id/sparkline", async ({ cookie, headers, params }) => {
+    const accountId = await getAccountId(cookie, headers);
+    if (!accountId) return new Response("Unauthorized", { status: 401 });
+
+    const [monitor] = await sql`
+      SELECT id FROM monitors WHERE id = ${params.id} AND account_id = ${accountId}
+    `;
+    if (!monitor) return new Response("Not found", { status: 404 });
+
+    const pings = await sql`
+      SELECT latency_ms FROM pings
+      WHERE monitor_id = ${params.id} AND latency_ms IS NOT NULL
+      ORDER BY checked_at DESC LIMIT 20
+    `;
+    const latencies = pings.map((p: any) => p.latency_ms).reverse();
+    return new Response(sparklineSSR(latencies), {
+      headers: { "content-type": "text/html; charset=utf-8" },
+    });
+  })
+
   // Docs
   .get("/docs", () => Bun.file(`${dashDir}/docs.html`));