fix: cap day-highlights chips at 50; show J/K hint when over limit

Rendering 793 individual buttons is both visually overwhelming and slow.
When a day has more than 50 loud sections, replace the chip list with a
single note ("N sections — use J / K to navigate"). J/K navigation and
the SVG timeline still cover all sections.

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

web.py

@@ -1472,24 +1472,33 @@ async function dayHighlights(dayId, analyzableFiles) {
   box.appendChild(labels);
 
   if (dayActiveSections.length) {
-    const chips = document.createElement('div');
+    const MAX_DAY_CHIPS = 50;
-    chips.className = 'chips';
+    if (dayActiveSections.length > MAX_DAY_CHIPS) {
-    chips.setAttribute('role', 'list');
+      const note = document.createElement('p');
-    chips.setAttribute('aria-label', 'Day loud sections — click to jump, J/K to step across files');
+      note.className = 'quiet';
-    dayActiveSections.forEach((sec, si) => {
+      note.style.marginTop = '6px';
-      const c = document.createElement('button');
+      note.textContent = `${dayActiveSections.length} sections — use J / K to navigate`;
-      c.className = 'chip';
+      box.appendChild(note);
-      c.setAttribute('role', 'listitem');
+    } else {
-      c.title = sec.filename + ' @ ' + fmtT(sec.start);
+      const chips = document.createElement('div');
-      const d = new Date(sec.absStart * 1000);
+      chips.className = 'chips';
-      const hms = d.getHours().toString().padStart(2,'0') + ':'
+      chips.setAttribute('role', 'list');
-                + d.getMinutes().toString().padStart(2,'0') + ':'
+      chips.setAttribute('aria-label', 'Day loud sections — click to jump, J/K to step across files');
-                + d.getSeconds().toString().padStart(2,'0');
+      dayActiveSections.forEach((sec, si) => {
-      c.textContent = hms;
+        const c = document.createElement('button');
-      c.addEventListener('click', () => jumpToDaySection(si));
+        c.className = 'chip';
-      chips.appendChild(c);
+        c.setAttribute('role', 'listitem');
-    });
+        c.title = sec.filename + ' @ ' + fmtT(sec.start);
-    box.appendChild(chips);
+        const d = new Date(sec.absStart * 1000);
+        const hms = d.getHours().toString().padStart(2,'0') + ':'
+                  + d.getMinutes().toString().padStart(2,'0') + ':'
+                  + d.getSeconds().toString().padStart(2,'0');
+        c.textContent = hms;
+        c.addEventListener('click', () => jumpToDaySection(si));
+        chips.appendChild(c);
+      });
+      box.appendChild(chips);
+    }
   }
 
   const summary = document.createElement('div');