Stats: heatmap to GitHub scale (365 days + month labels)

- heatmap now fetches /api/stats?days=365 (endpoint already caps at
  365; no server change) so the grid spans the past year
- week columns with month labels (Aug, Sep, ...), first column
  labelled by its first in-window day, final column padded
- grid wrapped in a horizontal-scroll container (53 weeks ~ 750px)

static/app.js

@@ -488,17 +488,37 @@ function heatMap(byDay, days) {
   const start = new Date(win);
   start.setDate(start.getDate() - (start.getDay() + 6) % 7);  // back to Monday
   const max = Math.max(1, ...Object.values(byDay || {}));
-  const box = el("div", "heat");
-  for (let d = new Date(start); d <= today; d.setDate(d.getDate() + 1)) {
-    const k = `${d.getFullYear()}-${String(d.getMonth() + 1).padStart(2, "0")}-${String(d.getDate()).padStart(2, "0")}`;
-    const v = (byDay || {})[k] || 0;
-    const c = el("i");
-    if (d < win) c.className = "none";
-    else if (v) {
-      c.className = "l" + Math.min(4, Math.ceil(v / max * 4));
-      c.title = k + " \u00b7 " + fmtMin(v / 60);
+  const MN = ["Jan", "Feb", "Mar", "Apr", "May", "Jun",
+              "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"];
+  const grid = el("div", "heat");
+  const lbl = el("div", "heat-lbl");
+  let lastM = -1;
+  for (let d = new Date(start); d <= today; ) {
+    const col = el("div", "heat-col");
+    const lab = el("span", "heat-lab");
+    const labD = new Date(d);
+    for (let i = 0; i < 7 && labD < win; i++) labD.setDate(labD.getDate() + 1);
+    if (labD <= today && labD.getMonth() !== lastM) {
+      lab.textContent = MN[labD.getMonth()];
+      lastM = labD.getMonth();
     }
-    box.append(c);
+    lbl.append(lab);
+    for (let i = 0; i < 7; i++) {
+      const c = el("i");
+      if (d > today) c.className = "none";  // pad the final column
+      else {
+        const k = `${d.getFullYear()}-${String(d.getMonth() + 1).padStart(2, "0")}-${String(d.getDate()).padStart(2, "0")}`;
+        const v = (byDay || {})[k] || 0;
+        if (d < win) c.className = "none";
+        else if (v) {
+          c.className = "l" + Math.min(4, Math.ceil(v / max * 4));
+          c.title = k + " \u00b7 " + fmtMin(v / 60);
+        }
+        d.setDate(d.getDate() + 1);
+      }
+      col.append(c);
+    }
+    grid.append(col);
   }
   const lg = el("div", "heat-lg");
   lg.append(el("span", "muted", "less"));
@@ -508,7 +528,7 @@ function heatMap(byDay, days) {
     lg.append(s);
   }
   lg.append(el("span", "muted", "more"));
-  return [box, lg];
+  return [lbl, grid, lg];
 }
 
 async function showStats() {
@@ -518,8 +538,17 @@ async function showStats() {
   main.append(el("h2", null, "Stats \u2014 last 30 days"));
   main.append(statsCards(d));
   const hm = el("section", null);
-  hm.append(el("h2", null, "Watch time by day"), ...heatMap(d.by_day, d.days));
+  const hmh = el("div", "sec-head");
+  hmh.append(el("h2", null, "Watch time by day"), el("span", "muted", "past year"));
+  hm.append(hmh, el("p", "muted", "loading\u2026"));
   main.append(hm);
+  api("/api/stats?days=365").then(d2 => {
+    hm.querySelector("p.muted")?.remove();
+    const [l, g, leg] = heatMap(d2.by_day, 365);
+    const w = el("div", "heat-wrap");
+    w.append(l, g);
+    hm.append(w, leg);
+  }).catch(() => hm.querySelector("p.muted")?.remove());
   const ta = topAnime(d);
   if (ta) main.append(ta);
   if (d.top_searches.length) {