Power curve: show record holder in tooltip and add records table

Find the activity that holds each MMP record by scanning per-activity
mmp arrays. Activity title appears in the chart hover tooltip. A table
below the chart lists every duration with the record watts, activity
title (linked), and date. The table has its own all-time/365d/90d toggle
independent of the chart overlays.

site/src/components/AthleteView.svelte

@@ -210,7 +210,7 @@
   {#if activeTab === 'power'}
     {#if athlete.power_curve.all_time}
       <div class="bg-zinc-900 rounded-xl p-4 border border-zinc-800">
-        <MmpChart {athlete} {activities} />
+        <MmpChart {athlete} {activities} {base} />
       </div>
     {:else}
       <p class="text-zinc-500 text-sm">No power data found. Make sure your activities include power meter data.</p>