feat(detail): let an event's goal be points, entered in the sheet

Some events want a number of points rather than a number of days. The
goal control gains Days and Points. Switching period keeps the measure
and the number, and the sheet keeps this period's number editable in
place. A target is capped where the schema reads it back, so a huge
number can't silently become no goal.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/client/App.tsx

@@ -789,6 +789,8 @@ export function App() {
           dailyDays={daily.daysFor(openRow.event.id)}
           goal={goalOf(openRow.event.id)}
           hasStoredGoal={prog.progress[openRow.event.id]?.goal !== undefined}
+          amounts={amounts.amountsFor(openRow.event.id)}
+          onSetAmount={amounts.setAmount}
           onDaily={prog.setDaily}
           onGoal={prog.setGoal}
           onToggleDay={daily.toggleDay}