Fix: log viewer wipes itself due to auto-reload on deploy done

Two bugs causing 'can't see why deploy failed':
- showLog() called window.location.reload() on the SSE 'done' event,
  wiping the log panel before the user could read it.
- For already-finished deploys, SSE would immediately fire 'done' and
  reload, showing logs for < 1 second.

Fix:
- showLog() now fetches the deploy via REST first. If done, it renders
  the stored log directly (no SSE). If still running, it streams via
  SSE and closes without reloading when done.
- Added onerror fallback: re-fetches the log via REST if SSE drops.
- Status badge (green/red) updates inline instead of triggering reload.
- Page now auto-opens the latest deploy log on load so the failure
  reason is visible immediately without any clicking.

https://claude.ai/code/session_01FKCW3FDjNFj6jve4niMFXH

server/src/routes/ui.rs

@@ -213,6 +213,8 @@ pub async fn app_detail(
     .await
     .unwrap_or_default();
 
+    let latest_deploy_id = deploys.first().map(|d| d.id.as_str()).unwrap_or("");
+
     let mut deploy_rows = String::new();
     for d in &deploys {
         let sha_short = d.sha.as_deref()
@@ -268,7 +270,7 @@ pub async fn app_detail(
                 <tbody>{deploy_rows}</tbody>
             </table>
             <div id="log-panel" style="display:none;margin-top:16px">
-                <h2 style="margin-bottom:8px">Build Log</h2>
+                <h2 id="log-title" style="margin-bottom:8px">Build Log</h2>
                 <pre id="log-out"></pre>
             </div>
         </div>
@@ -299,20 +301,64 @@ pub async fn app_detail(
 
         <script>
         const APP_ID = '{app_id}';
+
+        // Auto-open the latest deploy log on page load.
+        window.addEventListener('DOMContentLoaded', () => {{
+            const latest = '{latest_deploy_id}';
+            if (latest) showLog(latest);
+        }});
+
         async function deploy() {{
             const r = await fetch('/api/apps/' + APP_ID + '/deploy', {{method:'POST'}});
             if (r.ok) {{ const d = await r.json(); showLog(d.id); }}
             else alert('Deploy failed: ' + await r.text());
         }}
-        function showLog(deployId) {{
+        async function showLog(deployId) {{
             const panel = document.getElementById('log-panel');
             const out   = document.getElementById('log-out');
+            const title = document.getElementById('log-title');
             panel.style.display = 'block';
-            out.textContent = '';
+            out.textContent = 'Loading…';
             panel.scrollIntoView({{behavior:'smooth'}});
+
+            // Fetch current deploy state first.
+            const r = await fetch('/api/deploys/' + deployId);
+            if (!r.ok) {{ out.textContent = 'Could not load deploy ' + deployId; return; }}
+            const deploy = await r.json();
+
+            title.textContent = 'Build Log — ' + deploy.status;
+            title.style.color = deploy.status === 'success' ? '#4ade80'
+                               : deploy.status === 'failed'  ? '#f87171' : '#fb923c';
+
+            // Already finished — just render the stored log, no SSE needed.
+            if (deploy.status === 'success' || deploy.status === 'failed') {{
+                out.textContent = deploy.log || '(no output captured)';
+                out.scrollTop = out.scrollHeight;
+                return;
+            }}
+
+            // Still running — stream updates via SSE.
+            out.textContent = '';
             const es = new EventSource('/api/deploys/' + deployId + '/logs');
-            es.onmessage = e => {{ out.textContent += e.data; out.scrollTop = out.scrollHeight; }};
-            es.addEventListener('done', () => {{ es.close(); window.location.reload(); }});
+            es.onmessage = e => {{
+                out.textContent += e.data;
+                out.scrollTop = out.scrollHeight;
+            }};
+            es.addEventListener('done', e => {{
+                es.close();
+                title.textContent = 'Build Log — ' + e.data;
+                title.style.color = e.data === 'success' ? '#4ade80' : '#f87171';
+            }});
+            es.onerror = () => {{
+                es.close();
+                // Fallback: re-fetch the finished log.
+                fetch('/api/deploys/' + deployId)
+                    .then(r => r.json())
+                    .then(d => {{
+                        out.textContent = d.log || out.textContent;
+                        title.textContent = 'Build Log — ' + d.status;
+                    }});
+            }};
         }}
         async function setEnv() {{
             const key = document.getElementById('ev-key').value.trim();
@@ -331,15 +377,16 @@ pub async fn app_detail(
             window.location.reload();
         }}
         </script>"#,
-        name         = app.name,
-        repo         = app.repo_url,
-        branch       = app.branch,
-        port         = app.port,
-        host         = host,
-        app_id       = app.id,
-        secret       = app.webhook_secret,
-        deploy_rows  = deploy_rows,
-        env_rows     = env_rows,
+        name              = app.name,
+        repo              = app.repo_url,
+        branch            = app.branch,
+        port              = app.port,
+        host              = host,
+        app_id            = app.id,
+        secret            = app.webhook_secret,
+        deploy_rows       = deploy_rows,
+        env_rows          = env_rows,
+        latest_deploy_id  = latest_deploy_id,
     );
 
     Ok(Html(page(&app.name, &body)))