feat(frontend): M9 模态 UI（mode 系统+共享 store+WS 客户端 + chat(思维链/工具回显/情绪徽标)/code/Agent 监控/后台思考页 + Miuix 设计 token + PWA）；tsc+vite build 通过

frontend/web/tailwind.config.ts

@@ -0,0 +1,35 @@
+import type { Config } from "tailwindcss";
+
+// Miuix design tokens (Cyrene v2 frontend). Tailwind v4 is CSS-first, so the
+// canonical token source is src/design/tokens.css (@theme). This config mirrors
+// the same token values for any tooling that reads a JS config, and is loaded by
+// the CSS via `@config "../../tailwind.config.ts"`. The six Miuix cores are
+// encoded directly in the values below.
+const config: Config = {
+  content: ["./index.html", "./src/**/*.{ts,tsx}"],
+  theme: {
+    extend: {
+      colors: {
+        // 多层 Surface：5 级色阶 #161616 → #0C0C0C → #1C1C1C → #242424 → #2C2C2C
+        surface: {
+          D1: "#161616",
+          D2: "#0C0C0C",
+          D3: "#1C1C1C",
+          D4: "#242424",
+          D5: "#2C2C2C",
+        },
+      },
+      borderRadius: {
+        // Smooth Corner：贝塞尔连续曲率 k=0.55 的圆角近似
+        smooth: "0.625rem",
+        glass: "1rem",
+      },
+      transitionTimingFunction: {
+        // 弹簧动效 cubic-bezier(0.34,1.56,0.64,1)，仅用于交互组件
+        spring: "cubic-bezier(0.34, 1.56, 0.64, 1)",
+      },
+    },
+  },
+};
+
+export default config;