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>

vite.config.ts

@@ -1,45 +1,49 @@
 import react from "@vitejs/plugin-react";
 import { compression } from "vite-plugin-compression2";
-import { defineConfig } from "vite";
+import { defineConfig, loadEnv } from "vite";
 
-export default defineConfig({
-  plugins: [
-    react(),
-    compression({ algorithms: ["gzip", "brotliCompress"], threshold: 1024 }),
-  ],
-  server: {
-    port: 5174,
-    host: "127.0.0.1",
-    proxy: {
-      "/api": {
-        target: "http://47.110.225.76:3600",
-        changeOrigin: true,
-      },
-    },
-  },
-  preview: {
-    port: 4174,
-    host: "127.0.0.1",
-  },
-  esbuild: {
-    drop: ["debugger"],
-  },
-  build: {
-    sourcemap: "hidden",
-    rollupOptions: {
-      output: {
-        manualChunks(id: string) {
-          if (id.includes("node_modules/react") || id.includes("node_modules/react-dom") || id.includes("node_modules/scheduler")) {
-            return "vendor-react";
-          }
-          if (id.includes("node_modules/@ant-design") || id.includes("node_modules/antd") || id.includes("node_modules/rc-")) {
-            return "vendor-antd";
-          }
-          if (id.includes("node_modules/@xyflow")) {
-            return "vendor-xyflow";
-          }
+export default defineConfig(({ mode }) => {
+  const env = loadEnv(mode, process.cwd(), "");
+
+  return {
+    plugins: [
+      react(),
+      compression({ algorithms: ["gzip", "brotliCompress"], threshold: 1024 }),
+    ],
+    server: {
+      port: 5174,
+      host: "127.0.0.1",
+      proxy: {
+        "/api": {
+          target: env.VITE_DEV_PROXY || "http://47.110.225.76:3600",
+          changeOrigin: true,
         },
       },
     },
-  },
-});
+    preview: {
+      port: 4174,
+      host: "127.0.0.1",
+    },
+    esbuild: {
+      drop: ["console", "debugger"],
+    },
+    build: {
+      sourcemap: "hidden",
+      rollupOptions: {
+        output: {
+          manualChunks(id: string) {
+            if (id.includes("node_modules/react") || id.includes("node_modules/react-dom") || id.includes("node_modules/scheduler")) {
+              return "vendor-react";
+            }
+            if (id.includes("node_modules/@ant-design") || id.includes("node_modules/antd") || id.includes("node_modules/rc-")) {
+              return "vendor-antd";
+            }
+            if (id.includes("node_modules/@xyflow")) {
+              return "vendor-xyflow";
+            }
+          },
+        },
+      },
+    },
+  };
+});