v1.1.0:6 — exercise history popup scrolls further

The clock-icon popup in the workout editor was capped at max-h-80
(~320px = ~5 history rows). Users with multi-year history saw older
sessions hidden behind a tiny inner scrollbar. Bumped to 70vh so it
scales with the viewport — ~15+ rows on a normal display, more on a
large monitor.

The IntersectionObserver pagination already loaded more rows on
demand; the old cap just kept them off-screen.

Pure CSS-class change. No schema, no API, no data.

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

proof-of-work/components/workouts/WorkoutForm.tsx

@@ -112,7 +112,12 @@ function ExerciseHistoryPopup({
   return (
     <div
       ref={popupRef}
-      className="absolute left-0 right-0 top-full mt-1 z-50 bg-zinc-900 border border-zinc-700 rounded-lg shadow-xl max-h-80 overflow-y-auto"
+      /* v1.1.0:6 — bump from max-h-80 (~320px, ~5 rows) to 70vh so
+         power users with multi-year history can scroll through ~15+
+         sessions without the popup feeling cramped. The
+         IntersectionObserver already loads more on demand; the old cap
+         just hid pages of data behind a tiny scrollbar. */
+      className="absolute left-0 right-0 top-full mt-1 z-50 bg-zinc-900 border border-zinc-700 rounded-lg shadow-xl max-h-[70vh] overflow-y-auto"
     >
       <div className="flex items-center justify-between px-3 py-2 border-b border-zinc-800 sticky top-0 bg-zinc-900 z-10">
         <span className="text-xs font-semibold text-zinc-400 uppercase tracking-wider">