Add friendly swap UI: timer + phase indicator + progress bar + collapsible logs

- Elapsed timer (mm:ss) in top-right of swap panel
- Phase display: Stopping / Starting / Loading weights (N/M shards) / Compiling / Warming up / Ready
- Progress bar with smooth fill mapped from phase
- Raw vLLM logs hidden behind <details> 'Show technical logs'
- Detection from log content (safetensors %, torch.compile, Application startup, Ray cluster join)
- Backfill from /api/swap/{id} on reattach (mid-swap reload works)

image/app/static/index.html

@@ -27,11 +27,21 @@
     <section id="swap-panel" class="swap-panel hidden">
       <div class="swap-header">
         <span class="spinner"></span>
-        <span id="swap-title">Swapping…</span>
+        <span id="swap-title">Swap in progress</span>
         <span class="spacer"></span>
-        <span class="muted small" id="swap-state"></span>
+        <span class="timer" id="swap-elapsed">0:00</span>
       </div>
-      <pre id="swap-log" class="log"></pre>
+      <div class="phase-row">
+        <div class="phase" id="swap-phase">Starting…</div>
+        <div class="phase-detail muted small" id="swap-phase-detail"></div>
+      </div>
+      <div class="phase-track">
+        <div class="phase-fill" id="swap-phase-fill"></div>
+      </div>
+      <details id="swap-log-details">
+        <summary class="muted small">Show technical logs</summary>
+        <pre id="swap-log" class="log"></pre>
+      </details>
     </section>
 
     <section id="cards" class="cards"></section>