fix: Submenu active state - use exact pathname match only

Problem: ALL submenu items showed active at once (screenshot evidence)
Root Cause: Complex logic with exact flag and startsWith() was broken
- startsWith logic caused multiple matches
- exact flag handling was inconsistent

Solution: Simplified to exact pathname match ONLY
- isActive = it.path === pathname
- No more startsWith, no more exact flag complexity
- One pathname = one active submenu item

Result: Only the current submenu item shows active ✅

Files Modified:
- admin-spa/src/components/nav/SubmenuBar.tsx (simplified logic)
- admin-spa/dist/app.js (rebuilt)

admin-spa/src/components/nav/SubmenuBar.tsx

@@ -26,16 +26,10 @@ export default function SubmenuBar({ items = [], fullscreen = false, headerVisib
         <div className="flex gap-2 overflow-x-auto no-scrollbar">
           {items.map((it) => {
             const key = `${it.label}-${it.path || it.href}`;
-            // Exact match for submenu items, or match with sub-paths (e.g., /settings/notifications matches /settings/notifications/staff)
-            // Special handling: if item has exact flag, only match exact path
-            let isActive = false;
-            if (it.path) {
-              if (it.exact) {
-                isActive = pathname === it.path;
-              } else {
-                isActive = pathname === it.path || pathname.startsWith(it.path + '/');
-              }
-            }
+            // Determine active state based on exact pathname match
+            // Only ONE submenu item should be active at a time
+            const isActive = it.path === pathname;
+            
             const cls = [
               'ui-ctrl inline-flex items-center gap-2 rounded-md px-2.5 py-1.5 border text-sm whitespace-nowrap',
               'focus:outline-none focus:ring-0 focus:shadow-none',