feat(02-03): install Schedule-X stack + CSS token layer + main.tsx imports

- Install @schedule-x/{calendar,react,theme-default,event-modal,events-service}@4.x
- Install temporal-polyfill@0.3.2 and lucide-react@1.17.0
- Create src/styles/tokens.css: all color/spacing/typography/breakpoint tokens
  plus --sx-color-* Schedule-X overrides mapped to project tokens
- Create src/styles/tokens.ts: TypeScript mirror of token values for inline styles
- Create src/styles/index.css: imports tokens.css + minimal global reset
- Update main.tsx: Temporal polyfill first, then SX theme CSS, then styles/index.css

apps/pwa/package.json

@@ -11,10 +11,17 @@
     "test": "vitest run"
   },
   "dependencies": {
+    "@schedule-x/calendar": "4.6.0",
+    "@schedule-x/event-modal": "4.6.0",
+    "@schedule-x/events-service": "4.6.0",
+    "@schedule-x/react": "4.1.0",
+    "@schedule-x/theme-default": "4.6.0",
     "@tanstack/react-query": "5.101.0",
     "ical.js": "2.2.1",
+    "lucide-react": "1.17.0",
     "react": "^19.0.0",
     "react-dom": "^19.0.0",
+    "temporal-polyfill": "0.3.2",
     "zustand": "5.0.14"
   },
   "devDependencies": {