Athlete segments tab: link best time to activity; expandable effort list

- best_activity_id now included in segment_summary API response
- Best time is a direct link to the activity that produced it
- Clicking a row expands an inline effort list (lazy-loaded from
  /api/segments/{id}/efforts): date linked to activity, time, Δ vs PR
- Clicking again collapses; ▲/▼ chevron shows state

bincio/serve/server.py

@@ -2700,6 +2700,7 @@ async def user_segment_summary(handle: str) -> JSONResponse:
                     "distance_m": seg.distance_m,
                 },
                 "best_elapsed_s":    best.elapsed_s,
+                "best_activity_id":  best.activity_id,
                 "effort_count":      len(efforts),
             })
     result.sort(key=lambda x: x["segment"]["name"].lower())

site/src/components/AthleteView.svelte

@@ -28,14 +28,36 @@
   interface SegmentSummaryItem {
     segment: { id: string; name: string; sport: string | null; distance_m: number };
     best_elapsed_s: number;
+    best_activity_id: string;
     effort_count: number;
   }
+  interface SegmentEffort {
+    activity_id: string;
+    started_at: string;
+    elapsed_s: number;
+  }
   let segmentSummary: SegmentSummaryItem[] = [];
   let segmentsLoading = false;
   let segmentsFetched = false;
   let segmentsHandle = '';
   let rescanning = false;
   let rescanMsg: string | null = null;
+  let expandedId: string | null = null;
+  let effortsBySegment: Record<string, SegmentEffort[]> = {};
+  let loadingEfforts: Record<string, boolean> = {};
+
+  async function toggleSegment(id: string) {
+    if (expandedId === id) { expandedId = null; return; }
+    expandedId = id;
+    if (!effortsBySegment[id] && !loadingEfforts[id]) {
+      loadingEfforts = { ...loadingEfforts, [id]: true };
+      try {
+        const r = await fetch(`/api/segments/${id}/efforts`, { credentials: 'include' });
+        if (r.ok) effortsBySegment = { ...effortsBySegment, [id]: await r.json() };
+      } catch { /* ignore */ }
+      loadingEfforts = { ...loadingEfforts, [id]: false };
+    }
+  }
 
   const editUrl = import.meta.env.PUBLIC_EDIT_URL ?? '';
   const editEnabled = editUrl !== '' || import.meta.env.PUBLIC_EDIT_ENABLED === 'true';
@@ -216,24 +238,87 @@
               <th class="px-4 py-2">Segment</th>
               <th class="px-4 py-2 hidden sm:table-cell">Distance</th>
               <th class="px-4 py-2">Best time</th>
-              <th class="px-4 py-2 text-right">Efforts</th>
+              <th class="px-4 py-2 text-right pr-4">Efforts</th>
             </tr>
           </thead>
           <tbody>
-            {#each segmentSummary as row}
+            {#each segmentSummary as row (row.segment.id)}
-              <tr class="border-b border-zinc-800/50 last:border-0 hover:bg-zinc-800/50 transition-colors">
+              <!-- Summary row -->
+              <tr
+                class="border-b border-zinc-800/50 hover:bg-zinc-800/40 transition-colors cursor-pointer select-none"
+                class:bg-zinc-800={expandedId === row.segment.id}
+                on:click={() => toggleSegment(row.segment.id)}
+                role="button"
+                tabindex="0"
+                on:keydown={e => e.key === 'Enter' && toggleSegment(row.segment.id)}
+              >
                 <td class="px-4 py-2.5">
-                  <a href="{base}segments/{row.segment.id}/"
+                  <div class="flex items-center gap-1.5">
-                     class="text-white hover:text-blue-400 transition-colors font-medium">
                     {#if row.segment.sport}
-                      <span class="mr-1.5">{sportIcon(row.segment.sport as any)}</span>
+                      <span>{sportIcon(row.segment.sport as any)}</span>
-                    {/if}{row.segment.name}
+                    {/if}
+                    <a href="{base}segments/{row.segment.id}/"
+                       class="text-white hover:text-blue-400 transition-colors font-medium"
+                       on:click|stopPropagation>
+                      {row.segment.name}
                     </a>
+                  </div>
                 </td>
                 <td class="px-4 py-2.5 text-zinc-400 hidden sm:table-cell">{formatDistance(row.segment.distance_m)}</td>
-                <td class="px-4 py-2.5 font-mono text-white">{formatElapsed(row.best_elapsed_s)}</td>
+                <td class="px-4 py-2.5">
-                <td class="px-4 py-2.5 text-zinc-400 text-right">{row.effort_count}</td>
+                  <a href="{base}activity/{row.best_activity_id}/"
+                     class="font-mono text-white hover:text-blue-400 transition-colors"
+                     on:click|stopPropagation
+                     title="Activity where this PR was set">
+                    {formatElapsed(row.best_elapsed_s)}
+                  </a>
+                </td>
+                <td class="px-4 py-2.5 text-zinc-400 text-right pr-4">
+                  <span class="inline-flex items-center gap-1.5">
+                    {row.effort_count}
+                    <span class="text-zinc-600 text-xs">{expandedId === row.segment.id ? '▲' : '▼'}</span>
+                  </span>
+                </td>
               </tr>
+
+              <!-- Expanded effort list -->
+              {#if expandedId === row.segment.id}
+                <tr class="border-b border-zinc-800/50">
+                  <td colspan="4" class="px-4 pb-3 pt-1">
+                    {#if loadingEfforts[row.segment.id]}
+                      <p class="text-zinc-500 text-xs py-2">Loading…</p>
+                    {:else}
+                      {@const efforts = effortsBySegment[row.segment.id] ?? []}
+                      {@const pr = efforts.length ? Math.min(...efforts.map(e => e.elapsed_s)) : 0}
+                      <div class="rounded-lg overflow-hidden border border-zinc-700/50">
+                        <table class="w-full text-xs">
+                          <tbody>
+                            {#each efforts as e (e.activity_id + e.started_at)}
+                              {@const delta = e.elapsed_s - pr}
+                              {@const isPR = delta === 0}
+                              <tr class="border-b border-zinc-700/30 last:border-0 hover:bg-zinc-700/20 transition-colors"
+                                  class:bg-green-950={isPR}>
+                                <td class="px-3 py-1.5">
+                                  <a href="{base}activity/{e.activity_id}/"
+                                     class="text-blue-400 hover:text-blue-300 transition-colors">
+                                    {new Date(e.started_at).toLocaleDateString('en-GB', { day: 'numeric', month: 'short', year: 'numeric' })}
+                                  </a>
+                                </td>
+                                <td class="px-3 py-1.5 font-mono text-white">{formatElapsed(e.elapsed_s)}</td>
+                                <td class="px-3 py-1.5 font-medium"
+                                    class:text-green-400={isPR}
+                                    class:text-zinc-500={!isPR}>
+                                  {#if isPR}PR{:else}+{delta < 60 ? `${delta}s` : `${Math.floor(delta/60)}m${(delta%60).toString().padStart(2,'0')}s`}{/if}
+                                </td>
+                              </tr>
+                            {/each}
+                          </tbody>
+                        </table>
+                      </div>
+                    {/if}
+                  </td>
+                </tr>
+              {/if}
             {/each}
           </tbody>
         </table>