fix(schedule): don't collapse same-named breaks across the day (#289)

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: JacobCoffee

src/app/providers/conference-data.ts

@@ -261,7 +261,12 @@ export class ConferenceData {
     data.schedule.filter((s: any) => collapseKinds.includes(s.kind)).forEach((slot: any) => {
       const day = new Date(slot.start).toLocaleDateString('en-us', {timeZone: environment.timezone, weekday: 'short'});
       const slotName = markdownToTxt(slot.name);
-      const key = `${slot.kind}-${day}-${slotName}`;
+      // Include start time in the key so morning and afternoon "Break"
+      // entries don't collapse into a single 10:30-4:30 row that spans
+      // the lunches and afternoon talks. Per-room same-start slots
+      // (e.g. all the 13:00 Lunch (Hall AB) entries across talk rooms)
+      // still share a key and merge correctly.
+      const key = `${slot.kind}-${day}-${slotName}-${slot.start}`;
       if (!collapsedGroups.has(key)) {
         // Rename lunchtime breaks
         let name = slot.kind === 'poster' ? 'Posters' : markdownToTxt(slot.name);