Fix: drop tsc project-references; build was failing in Docker

The composite-mode + project-references setup broke `@/*` path alias
resolution inside the Docker stage 1 build (worked locally because tsc's
incremental cache was warm). Switch to a single tsconfig with
`tsc --noEmit && vite build` — Vite handles the alias via its own
resolver, so we only use tsc as a type-checker.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

web/package.json

@@ -5,7 +5,7 @@
   "type": "module",
   "scripts": {
     "dev": "vite",
-    "build": "tsc -b && vite build",
+    "build": "tsc --noEmit && vite build",
     "preview": "vite preview",
     "lint": "eslint . --ext ts,tsx --max-warnings=0"
   },