fix(dev): resolve local stack ports before startup

scripts/dev-web-rust.mjs

@@ -1,6 +1,11 @@
 import {spawn} from 'node:child_process';
 import {existsSync, readFileSync} from 'node:fs';
 import {resolve} from 'node:path';
+import {
+  findAvailablePort,
+  formatPortDecision,
+  normalizePort,
+} from './dev-stack-port-utils.mjs';
 
 const repoRoot = process.cwd();
 const shellEnvKeys = new Set(Object.keys(process.env));
@@ -121,9 +126,24 @@ const mergedEnv = {
 
 console.log(`[dev:web] backend=rust target=${mergedEnv.GENARRATIVE_RUNTIME_SERVER_TARGET}`);
 
+const webHost = '0.0.0.0';
+const preferredWebPort = normalizePort(fileEnv.WEB_PORT, 3000);
+const webPort = await findAvailablePort({
+  host: webHost,
+  preferredPort: preferredWebPort,
+});
+console.log(
+  formatPortDecision({
+    name: 'web',
+    host: webHost,
+    preferredPort: preferredWebPort,
+    resolvedPort: webPort,
+  }),
+);
+
 const child = spawn(
   'node',
-  ['scripts/vite-cli.mjs', '--port=3000', '--host=0.0.0.0', '--strictPort'],
+  ['scripts/vite-cli.mjs', `--port=${webPort}`, `--host=${webHost}`, '--strictPort'],
   {
     cwd: process.cwd(),
     env: mergedEnv,