feat: move toggle to toolbar, sort apps by name, overlay expand

- Move expand/collapse toggle from stat strip to dedicated toolbar
  below KPIs
- Sort app groups alphabetically by name
- Expanded card overlays from clicked card position instead of
  pushing other cards down
- Viewport constraint: overlay flips right-alignment and limits
  height when near edges

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

ui/src/pages/AgentHealth/AgentHealth.module.css

@@ -13,7 +13,7 @@
 /* Stat strip */
 .statStrip {
   display: grid;
-  grid-template-columns: repeat(5, 1fr) auto;
+  grid-template-columns: repeat(5, 1fr);
   gap: 10px;
   margin-bottom: 16px;
 }
@@ -99,6 +99,7 @@
   grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
   gap: 10px;
   margin-bottom: 20px;
+  position: relative;
 }
 
 /* Group meta row */
@@ -317,25 +318,49 @@
   color: var(--card-accent);
 }
 
-/* Expanded card inside compact grid */
+/* Wrapper for each compact grid cell — anchor for overlay */
+.compactGridCell {
+  position: relative;
+}
+
+/* Expanded card overlay — floats from the clicked card */
 .compactGridExpanded {
-  grid-column: span 2;
+  position: absolute;
+  z-index: 10;
+  top: 0;
+  left: 0;
+  min-width: 500px;
+  background: var(--bg-body);
+  border-radius: var(--radius-md);
+  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
+  padding: 4px;
 }
 
 /* Expand/collapse animation wrapper */
 .expandWrapper {
   overflow: hidden;
-  transition: max-height 200ms ease, opacity 150ms ease;
+  transition: opacity 200ms ease, transform 200ms ease;
 }
 
 .expandWrapperCollapsed {
-  max-height: 0;
   opacity: 0;
+  transform: scaleY(0.95);
+  transform-origin: top;
 }
 
 .expandWrapperExpanded {
-  max-height: 1000px;
   opacity: 1;
+  transform: scaleY(1);
+  transform-origin: top;
+}
+
+/* View toolbar — between stat strip and cards grid */
+.viewToolbar {
+  display: flex;
+  align-items: center;
+  justify-content: flex-end;
+  gap: 8px;
+  margin-bottom: 12px;
 }
 
 /* View mode toggle */

ui/src/pages/AgentHealth/AgentHealth.tsx

@@ -289,7 +289,7 @@ export default function AgentHealth() {
 
   const agentList = agents ?? [];
 
-  const groups = useMemo(() => groupByApp(agentList), [agentList]);
+  const groups = useMemo(() => groupByApp(agentList).sort((a, b) => a.appId.localeCompare(b.appId)), [agentList]);
 
   // Aggregate stats
   const totalInstances = agentList.length;
@@ -515,6 +515,10 @@ export default function AgentHealth() {
           accent={deadCount > 0 ? 'error' : 'success'}
           detail={deadCount > 0 ? 'requires attention' : 'all healthy'}
         />
+      </div>
+
+      {/* View toolbar */}
+      <div className={styles.viewToolbar}>
         <div className={styles.viewToggle}>
           <button
             className={`${styles.viewToggleBtn} ${viewMode === 'compact' ? styles.viewToggleBtnActive : ''}`}
@@ -702,10 +706,29 @@ export default function AgentHealth() {
         </div>
       ) : (
         <div className={styles.compactGrid}>
-          {groups.map((group) =>
+          {groups.map((group) => (
-            expandedApps.has(group.appId) ? (
+            <div key={group.appId} className={styles.compactGridCell}>
+              <CompactAppCard
+                group={group}
+                onExpand={() => animateToggle(group.appId)}
+              />
+              {expandedApps.has(group.appId) && (
                 <div
-                key={group.appId}
+                  ref={(el) => {
+                    if (!el) return;
+                    // Constrain overlay within viewport
+                    const rect = el.getBoundingClientRect();
+                    const vw = document.documentElement.clientWidth;
+                    if (rect.right > vw - 16) {
+                      el.style.left = 'auto';
+                      el.style.right = '0';
+                    }
+                    if (rect.bottom > document.documentElement.clientHeight) {
+                      const overflow = rect.bottom - document.documentElement.clientHeight + 16;
+                      el.style.maxHeight = `${rect.height - overflow}px`;
+                      el.style.overflowY = 'auto';
+                    }
+                  }}
                   className={`${styles.compactGridExpanded} ${styles.expandWrapper} ${
                     animatingApps.get(group.appId) === 'expanding'
                       ? styles.expandWrapperCollapsed
@@ -773,15 +796,10 @@ export default function AgentHealth() {
                     />
                   </GroupCard>
                 </div>
-            ) : (
-              <CompactAppCard
-                key={group.appId}
-                group={group}
-                onExpand={() => animateToggle(group.appId)}
-              />
-            ),
               )}
             </div>
+          ))}
+        </div>
       )}
 
       {/* Log + Timeline side by side */}