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

site/src/components/SegmentsView.svelte

@@ -23,8 +23,6 @@
   let loading = false;
   let selectedId: string | null = null;
   let fetchTimer: ReturnType<typeof setTimeout> | null = null;
-  let rescanning = false;
-  let rescanMsg: string | null = null;
 
   const TILE_STYLE = 'https://tiles.openfreemap.org/styles/positron';
   const SEG_COLOR  = '#f59e0b';
@@ -125,20 +123,6 @@
       ['case', ['==', ['get', 'id'], selectedId ?? ''], 5, 3]);
   }
 
-  async function rescanAll() {
-    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' : ''}.`;
-      else rescanMsg = d.detail ?? 'Rescan failed.';
-    } catch {
-      rescanMsg = 'Could not reach server.';
-    }
-    rescanning = false;
-  }
-
   async function deleteSegment(id: string) {
     if (!confirm('Delete this segment? This cannot be undone.')) return;
     try {
@@ -160,21 +144,10 @@
   <div class="flex items-center justify-between px-4 py-3 border-b shrink-0"
        style="border-color: var(--border)">
     <h1 class="text-lg font-bold text-white">Segments</h1>
-    <div class="flex items-center gap-2">
-      {#if rescanMsg}
-        <span class="text-xs text-zinc-400">{rescanMsg}</span>
-      {/if}
-      <button
-        on:click={rescanAll}
-        disabled={rescanning}
-        title="Rescan all your activities against all segments"
-        class="px-3 py-1.5 rounded-lg text-sm border border-zinc-700 text-zinc-400 hover:border-zinc-500 hover:text-white transition-colors disabled:opacity-40"
-      >{rescanning ? 'Scanning…' : 'Rescan all'}</button>
-      <a href="{base}segments/new/"
-         class="px-3 py-1.5 rounded-lg text-sm bg-blue-600 hover:bg-blue-500 text-white transition-colors">
-        + New segment
-      </a>
-    </div>
+    <a href="{base}segments/new/"
+       class="px-3 py-1.5 rounded-lg text-sm bg-blue-600 hover:bg-blue-500 text-white transition-colors">
+      + New segment
+    </a>
   </div>
 
   <!-- Map -->