feat(mechanic-pwa): scaffold Vite+React+TS+Tailwind+shadcn+PWA+routing (Phase G G1-G5)

- Vite 8 + React 19 + TypeScript 6 project via create-vite react-ts template
- Tailwind v3.4 with shadcn-compatible cream palette (CSS vars)
- vite-plugin-pwa v1.3 with autoUpdate SW, manifest.webmanifest, 192+512 icons
- shadcn/ui components written manually (default style): button, card, input, label, sonner
- Zustand persist auth store, ky API client with Bearer token hooks
- React Router v7 routing with RequireAuth guard
- TanStack Query v5 + Toaster wired in main.tsx
- 5 stub pages: Login, Home, VehicleCard, InspectionEditor, InspectionReview
- Build: 293 KB JS / 9.4 KB CSS, clean zero-warning tsc+vite build

Co-Authored-By: claude-flow <ruv@ruv.net>

mechanic-pwa/frontend/tailwind.config.js

@@ -0,0 +1,53 @@
+/** @type {import('tailwindcss').Config} */
+export default {
+  darkMode: ["class"],
+  content: ["./index.html", "./src/**/*.{ts,tsx}"],
+  theme: {
+    container: {
+      center: true,
+      padding: "1rem",
+    },
+    extend: {
+      fontFamily: {
+        sans: ["Inter", "system-ui", "sans-serif"],
+      },
+      colors: {
+        border: "hsl(var(--border))",
+        input: "hsl(var(--input))",
+        ring: "hsl(var(--ring))",
+        background: "hsl(var(--background))",
+        foreground: "hsl(var(--foreground))",
+        primary: {
+          DEFAULT: "hsl(var(--primary))",
+          foreground: "hsl(var(--primary-foreground))",
+        },
+        secondary: {
+          DEFAULT: "hsl(var(--secondary))",
+          foreground: "hsl(var(--secondary-foreground))",
+        },
+        destructive: {
+          DEFAULT: "hsl(var(--destructive))",
+          foreground: "hsl(var(--destructive-foreground))",
+        },
+        muted: {
+          DEFAULT: "hsl(var(--muted))",
+          foreground: "hsl(var(--muted-foreground))",
+        },
+        accent: {
+          DEFAULT: "hsl(var(--accent))",
+          foreground: "hsl(var(--accent-foreground))",
+        },
+        card: {
+          DEFAULT: "hsl(var(--card))",
+          foreground: "hsl(var(--card-foreground))",
+        },
+      },
+      borderRadius: {
+        lg: "var(--radius)",
+        md: "calc(var(--radius) - 2px)",
+        sm: "calc(var(--radius) - 4px)",
+      },
+    },
+  },
+  plugins: [],
+};