fix(dev): pass --host 0.0.0.0 to astro dev when --mobile, print LAN URL

bincio/dev.py

@@ -205,7 +205,10 @@ def dev(
             console.print(f"  Mobile:  [bold cyan]{mobile_url}[/bold cyan]  ← set this as instance URL in the app")
     else:
         console.print(f"  Auth:    [yellow]none[/yellow] (single-user, no instance.db)")
-    console.print(f"  Browser: [cyan]http://localhost:{port}[/cyan]")
+    if api_host == "0.0.0.0":
+        console.print(f"  Browser: [bold cyan]http://{lan_ip}:{port}[/bold cyan]  ← open this on mobile")
+    else:
+        console.print(f"  Browser: [cyan]http://localhost:{port}[/cyan]")
     console.print()
 
     _ensure_npm(site)
@@ -255,10 +258,9 @@ def dev(
     console.print(f"Starting [cyan]astro dev[/cyan] on port {port}…")
     console.print()
     try:
-        subprocess.run(
-            ["npm", "run", "dev", "--", "--port", str(port)],
-            cwd=site,
-            env=env,
-        )
+        astro_cmd = ["npm", "run", "dev", "--", "--port", str(port)]
+        if api_host == "0.0.0.0":
+            astro_cmd += ["--host", "0.0.0.0"]
+        subprocess.run(astro_cmd, cwd=site, env=env)
     except KeyboardInterrupt:
         pass