Add Disconnect button to Strava section of upload modal

site/src/layouts/Base.astro

@@ -402,6 +402,11 @@ try {
                 class="flex-1 py-1.5 px-3 rounded-lg text-xs bg-zinc-800 hover:bg-zinc-700 text-zinc-400 hover:text-zinc-200 transition-colors"
                 title="Clear sync point — next sync re-checks all Strava activities"
               >Hard reset</button>
+              <button
+                id="strava-disconnect-modal-btn"
+                class="flex-1 py-1.5 px-3 rounded-lg text-xs bg-zinc-800 hover:bg-red-900 text-zinc-400 hover:text-red-300 transition-colors"
+                title="Disconnect from Strava — you will need to reconnect via OAuth"
+              >Disconnect</button>
             </div>
           </div>
           <p id="strava-status" class="mt-3 text-xs text-center" style="min-height: 1.25rem"></p>
@@ -934,6 +939,26 @@ try {
       stravaResetSoftBtn.addEventListener('click', () => stravaReset('soft'));
       stravaResetHardBtn.addEventListener('click', () => stravaReset('hard'));
 
+      document.getElementById('strava-disconnect-modal-btn')?.addEventListener('click', async () => {
+        if (!confirm('Disconnect from Strava? You will need to reconnect via OAuth to re-enable sync.')) return;
+        try {
+          const r = await fetch(`${editUrl}/api/strava/disconnect`, { method: 'POST', credentials: 'include' });
+          if (r.ok) {
+            stravaStatus.textContent = 'Disconnected.';
+            stravaStatus.style.color = '#4ade80';
+            stravaConnect.style.display = '';
+            stravaSync.style.display = 'none';
+          } else {
+            const d = await r.json();
+            stravaStatus.textContent = d.detail ?? 'Failed to disconnect.';
+            stravaStatus.style.color = '#f87171';
+          }
+        } catch {
+          stravaStatus.textContent = 'Could not reach server.';
+          stravaStatus.style.color = '#f87171';
+        }
+      });
+
       // ── Strava ZIP upload ─────────────────────────────────────────────────
       function doZipUpload(file) {
         if (!file) return;