Improve multi month polls

static/poll.js

@@ -49,6 +49,14 @@ function renderAll() {
     cal = new Calendar($("calendar"), {
       canClick: (ds) => canVote && byDate.has(ds),
       isOffered: (ds) => byDate.has(ds),
+      months: () => {
+        const counts = new Map();
+        for (const ds of byDate.keys()) {
+          const key = ds.slice(0, 7);
+          counts.set(key, (counts.get(key) || 0) + 1);
+        }
+        return counts;
+      },
       isPicked: (ds) => byDate.has(ds) && myPicks.has(byDate.get(ds).id),
       onToggle: (ds) => {
         const id = byDate.get(ds).id;
@@ -85,8 +93,11 @@ function renderAll() {
 
 function updateSummary() {
   const n = myPicks.size;
+  const total = poll.options.length;
   $("vote-summary").textContent =
-    n === 0 ? "No days circled yet." : n === 1 ? "1 day circled." : `${n} days circled.`;
+    n === 0
+      ? `No days circled yet — ${total} ${total === 1 ? "day" : "days"} offered.`
+      : `${n} of ${total} offered days circled.`;
 }
 
 function renderResults() {