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/PageTransition.tsx

@@ -7,9 +7,40 @@ interface PageTransitionProps {
 
 const EXIT_DURATION_MS = 180;
 
+const NAV_ORDER: string[] = [
+  "home",
+  "workbench",
+  "ecommerce",
+  "ecommerceTemplates",
+  "sizeTemplate",
+  "canvas",
+  "scriptTokens",
+  "tokenUsage",
+  "community",
+  "assets",
+  "more",
+  "imageWorkbench",
+  "resolutionUpscale",
+  "watermarkRemoval",
+  "subtitleRemoval",
+  "digitalHuman",
+  "avatarConsole",
+  "characterMix",
+  "agent",
+  "settings",
+  "login",
+  "profile",
+  "report",
+];
+
+function getNavIndex(key: string): number {
+  return NAV_ORDER.indexOf(key);
+}
+
 export default function PageTransition({ viewKey, children }: PageTransitionProps) {
   const [displayedChildren, setDisplayedChildren] = useState(children);
   const [phase, setPhase] = useState<"idle" | "exit">("idle");
+  const [direction, setDirection] = useState<"forward" | "backward" | "neutral">("neutral");
   const prevKeyRef = useRef(viewKey);
   const timerRef = useRef<ReturnType<typeof setTimeout>>();
 
@@ -18,6 +49,15 @@ export default function PageTransition({ viewKey, children }: PageTransitionProp
       setDisplayedChildren(children);
       return;
     }
+    const prevIndex = getNavIndex(prevKeyRef.current);
+    const nextIndex = getNavIndex(viewKey);
+    if (prevIndex < nextIndex) {
+      setDirection("forward");
+    } else if (prevIndex > nextIndex) {
+      setDirection("backward");
+    } else {
+      setDirection("neutral");
+    }
     prevKeyRef.current = viewKey;
     setPhase("exit");
     timerRef.current = setTimeout(() => {
@@ -27,8 +67,10 @@ export default function PageTransition({ viewKey, children }: PageTransitionProp
     return () => clearTimeout(timerRef.current);
   }, [viewKey, children]);
 
+  const dirClass = direction === "forward" ? " is-forward" : direction === "backward" ? " is-backward" : "";
+
   return (
-    <div className={phase === "exit" ? "page-transition-wrap page-motion--exit" : "page-transition-wrap"}>
+    <div className={phase === "exit" ? `page-transition-wrap page-motion--exit${dirClass}` : `page-transition-wrap${phase === "idle" && direction !== "neutral" ? ` page-motion--enter${dirClass}` : ""}`}>
       {displayedChildren}
     </div>
   );