feat(dashboard): add tokens consumed per day chart to Progress page

Fetches /token-events/?limit=1000 in parallel with progress events and
renders a second area+line chart (amber) below the events-per-day chart,
aggregating tokens_in + tokens_out per calendar day over the same 30-day window.

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

state-hub/dashboard/src/progress.md

@@ -9,21 +9,26 @@ import {API, POLL} from "./components/config.js";
 ```js
 const progState = (async function*() {
   while (true) {
-    let data = [], ok = false;
+    let data = [], tokenEvents = [], ok = false;
     try {
-      const r = await fetch(`${API}/progress/?limit=500`);
-      ok = r.ok;
-      data = ok ? await r.json() : [];
+      const [r1, r2] = await Promise.all([
+        fetch(`${API}/progress/?limit=500`),
+        fetch(`${API}/token-events/?limit=1000`),
+      ]);
+      ok = r1.ok;
+      data = ok ? await r1.json() : [];
+      tokenEvents = r2.ok ? await r2.json() : [];
     } catch {}
-    yield {data, ok, ts: new Date()};
+    yield {data, tokenEvents, ok, ts: new Date()};
     await new Promise(res => setTimeout(res, POLL));
   }
 })();
 ```
 
 ```js
-const data = progState.data ?? [];
-const _ok  = progState.ok   ?? false;
+const data        = progState.data        ?? [];
+const tokenEvents = progState.tokenEvents ?? [];
+const _ok  = progState.ok  ?? false;
 const _ts  = progState.ts;
 ```
 
@@ -79,6 +84,34 @@ display(byDay.length === 0
 );
 ```
 
+```js
+const tokensByDay = Object.entries(
+  tokenEvents
+    .filter(e => new Date(e.created_at) >= cutoff)
+    .reduce((acc, e) => {
+      const day = e.created_at.slice(0, 10);
+      acc[day] = (acc[day] ?? 0) + (e.tokens_in || 0) + (e.tokens_out || 0);
+      return acc;
+    }, {})
+).sort().map(([day, tokens]) => ({day, tokens}));
+
+display(tokensByDay.length === 0
+  ? html`<p style="color:gray">No token data in the last 30 days.</p>`
+  : Plot.plot({
+      title: "Tokens consumed per day (30-day window)",
+      x: {label: "Date", tickRotate: -30},
+      y: {label: "Tokens", grid: true, tickFormat: "~s"},
+      marks: [
+        Plot.areaY(tokensByDay, {x: "day", y: "tokens", fill: "#f28e2b", fillOpacity: 0.3}),
+        Plot.lineY(tokensByDay, {x: "day", y: "tokens", stroke: "#f28e2b"}),
+        Plot.ruleY([0]),
+      ],
+      marginBottom: 60,
+      width: 750,
+    })
+);
+```
+
 ## Event Log
 
 ```js