feat: UI interaction polish — exit animations, hover effects, directional transitions

- Add AnimatedPanel component with CSS transition-based enter/exit for
  Profile popover and Notification panel (140ms scale+fade)
- Add nav-activate-pulse animation for floating-nav active indicator (320ms glow)
- Add tool-panel-fade-in crossfade when switching ecommerce tools
- Add carousel-card-label slide-up-in 260ms on active carousel card
- Add feature-visual img hover scale(1.03)+brightness, experience-route hover translateY(-2px)
- Add community-case-card--mosaic hover scale(1.02)+shadow lift
- Add directional PageTransition: forward→slideX(20px), backward→slideX(-20px)
- Move vite proxy target from hardcoded IP to VITE_DEV_PROXY env variable
- Add .env.example for developer onboarding

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/components/AppShell.tsx

@@ -16,6 +16,7 @@ import { canManageCommunityCases, canReviewCommunity } from "../features/communi
 import type { WebNavItem, WebNotification, WebUsageSummary, WebUserSession, WebViewKey } from "../types";
 import NotificationCenter from "./NotificationCenter";
 import { RechargeModal } from "./RechargeModal/RechargeModal";
+import { AnimatedPanel } from "./AnimatedPanel";
 
 interface AppShellProps {
   activeView: WebViewKey;
@@ -61,6 +62,8 @@ function AppShell({
   const [profileOpen, setProfileOpen] = useState(false);
   const [rechargeOpen, setRechargeOpen] = useState(false);
   const [openSubmenuKey, setOpenSubmenuKey] = useState<WebViewKey | null>(null);
+  const prevActiveViewRef = useRef<WebViewKey>(activeView);
+  const [navJustActivated, setNavJustActivated] = useState<WebViewKey | null>(null);
   const isAuthView = activeView === "login";
   const isImmersiveView = activeView === "agent" || activeView === "avatarConsole";
   const showFloatingNav = !isAuthView && !isImmersiveView && activeView !== "home";
@@ -100,6 +103,15 @@ function AppShell({
     [navItems],
   );
 
+  useEffect(() => {
+    if (activeView !== prevActiveViewRef.current) {
+      setNavJustActivated(activeView);
+      prevActiveViewRef.current = activeView;
+      const timer = window.setTimeout(() => setNavJustActivated(null), 320);
+      return () => window.clearTimeout(timer);
+    }
+  }, [activeView]);
+
   useEffect(() => {
     if (typeof document === "undefined") {
       return;
@@ -223,8 +235,8 @@ function AppShell({
                   <button
                     type="button"
                     className={`floating-nav__button${isActive ? " is-active" : ""}${
-                      workspaceExpanded && index === 3 ? " has-divider" : ""
-                    }`}
+                      navJustActivated === item.key ? " nav-just-activated" : ""
+                    }${workspaceExpanded && index === 3 ? " has-divider" : ""}`}
                     title={`${item.label} / ${item.hint}`}
                     aria-label={item.label}
                     onClick={() => onSelectView(item.children?.[0]?.key ?? item.key)}
@@ -330,8 +342,7 @@ function AppShell({
                     </>
                   )}
                 </button>
-                {session && profileOpen ? (
-                  <div className="profile-popover panel-surface">
+                <AnimatedPanel open={session ? profileOpen : false} className="profile-popover panel-surface">
                     <div className="profile-popover__head">
                       <span className="profile-popover__avatar">
                         {avatarUrl ? <img src={avatarUrl} alt={displayName} /> : avatarLabel}
@@ -410,8 +421,7 @@ function AppShell({
                         </button>
                       </>
                     ) : null}
-                  </div>
-                ) : null}
+                  </AnimatedPanel>
               </div>
             </div>
             </header>