fix(web-basic): make documented dev command work from clean install (#39)

- Fix root dev:web-basic script to use pnpm --dir instead of
  wrong package filter (@intent/web-basic does not exist;
  the actual package name is web-basic)
- Add Vite resolve aliases for @intent/core, @intent/dom,
  @intent/router so Vite resolves workspace packages from
  source during development, eliminating the need for
  pnpm build before pnpm dev:web-basic
- Update docs/Demo.md to mention the root command as an
  alternative to the cd-based path

Validation (from clean dist):
  pnpm test:   310 tests passed (127 core + 72 router + 21 testing + 4 server + 86 dom)
  pnpm typecheck: passes
  pnpm build:  passes (all packages + vite build)
  pnpm dev:web-basic: Vite starts cleanly in <150ms with no resolution errors

Author: mahyarmlk

docs/Demo.md

@@ -14,6 +14,12 @@ library, or an API route framework.
 
 ## How to run the demo
 
+```sh
+pnpm dev:web-basic
+```
+
+Or from the example directory:
+
 ```sh
 cd examples/web-basic
 pnpm dev

examples/web-basic/vite.config.ts

@@ -2,6 +2,11 @@ import { defineConfig } from "vite"
 
 export default defineConfig({
   resolve: {
+    alias: {
+      "@intent/core": new URL("../../packages/core/src/index.ts", import.meta.url).pathname,
+      "@intent/dom": new URL("../../packages/dom/src/index.ts", import.meta.url).pathname,
+      "@intent/router": new URL("../../packages/router/src/index.ts", import.meta.url).pathname,
+    },
     conditions: ["development", "browser"],
   },
 })

package.json

@@ -6,7 +6,7 @@
     "test": "pnpm -r test",
     "typecheck": "tsc -p tsconfig.typecheck.json",
     "lint": "tsc -p tsconfig.typecheck.json",
-    "dev:web-basic": "pnpm --filter @intent/web-basic dev"
+    "dev:web-basic": "pnpm --dir examples/web-basic dev"
   },
   "engines": {
     "node": ">=18"