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/tsconfig.json

@@ -1,6 +1,5 @@
 {
   "compilerOptions": {
-    "composite": true,
     "target": "ES2022",
     "lib": ["ES2022", "DOM", "DOM.Iterable"],
     "module": "ESNext",
@@ -19,9 +18,7 @@
     "baseUrl": ".",
     "paths": {
       "@/*": ["./src/*"]
-    },
-    "tsBuildInfoFile": "./.tsbuildinfo"
+    }
   },
-  "include": ["src"],
-  "references": [{ "path": "./tsconfig.node.json" }]
+  "include": ["src", "vite.config.ts"]
 }