Move segment rescan button from segments list to athlete/segments tab

site/src/components/AthleteView.svelte

@@ -33,6 +33,8 @@
   let segmentSummary: SegmentSummaryItem[] = [];
   let segmentsLoading = false;
   let segmentsHandle = '';
+  let rescanning = false;
+  let rescanMsg: string | null = null;
 
   const editUrl = import.meta.env.PUBLIC_EDIT_URL ?? '';
   const editEnabled = editUrl !== '' || import.meta.env.PUBLIC_EDIT_ENABLED === 'true';
@@ -177,6 +179,29 @@
 
   <!-- Segments tab -->
   {:else if activeTab === 'segments'}
+    <div class="flex items-center justify-between mb-4">
+      <span></span>
+      <div class="flex items-center gap-3">
+        {#if rescanMsg}<span class="text-xs text-zinc-400">{rescanMsg}</span>{/if}
+        <button
+          on:click={async () => {
+            rescanning = true; rescanMsg = null;
+            try {
+              const r = await fetch('/api/me/segment-rescan', { method: 'POST', credentials: 'include' });
+              const d = await r.json();
+              if (r.ok) {
+                rescanMsg = `Found ${d.efforts_found} effort${d.efforts_found !== 1 ? 's' : ''}.`;
+                // Refresh the summary
+                segmentSummary = [];
+              } else rescanMsg = d.detail ?? 'Rescan failed.';
+            } catch { rescanMsg = 'Could not reach server.'; }
+            rescanning = false;
+          }}
+          disabled={rescanning}
+          class="text-xs px-3 py-1.5 rounded-lg border border-zinc-700 text-zinc-400 hover:border-zinc-500 hover:text-white transition-colors disabled:opacity-40"
+        >{rescanning ? 'Scanning…' : 'Rescan all activities'}</button>
+      </div>
+    </div>
     {#if segmentsLoading}
       <p class="text-zinc-500 text-sm">Loading segments…</p>
     {:else if segmentSummary.length === 0}