fix: support mobile access when dev server binds to 0.0.0.0

- Vite server respects T3CODE_HOST for network binding
- Skip hardcoded VITE_WS_URL when host is not localhost, letting the
  client derive WS URL from window.location
- HMR auto-detects host when binding to 0.0.0.0

Author: 42tg

apps/web/src/lib/utils.ts

@@ -52,13 +52,19 @@ export const resolveServerUrl = (options?: {
   pathname?: string | undefined;
   searchParams?: Record<string, string> | undefined;
 }): string => {
-  const rawUrl = firstNonEmptyString(
+  let rawUrl = firstNonEmptyString(
     options?.url,
     window.desktopBridge?.getWsUrl(),
     import.meta.env.VITE_WS_URL,
     window.location.origin,
   );
 
+  // When accessing from a remote host (e.g. mobile), replace localhost in the
+  // resolved URL with the actual page hostname so the connection reaches the server.
+  if (rawUrl.includes("localhost") && window.location.hostname !== "localhost") {
+    rawUrl = rawUrl.replace("localhost", window.location.hostname);
+  }
+
   const parsedUrl = new URL(rawUrl);
   if (options?.protocol) {
     parsedUrl.protocol = options.protocol;

apps/web/vite.config.ts

@@ -6,6 +6,7 @@ import { defineConfig } from "vite";
 import pkg from "./package.json" with { type: "json" };
 
 const port = Number(process.env.PORT ?? 5733);
+const host = process.env.T3CODE_HOST ?? "localhost";
 const sourcemapEnv = process.env.T3CODE_WEB_SOURCEMAP?.trim().toLowerCase();
 
 const buildSourcemap =
@@ -42,14 +43,9 @@ export default defineConfig({
   },
   server: {
     port,
+    host,
     strictPort: true,
-    hmr: {
-      // Explicit config so Vite's HMR WebSocket connects reliably
-      // inside Electron's BrowserWindow. Vite 8 uses console.debug for
-      // connection logs — enable "Verbose" in DevTools to see them.
-      protocol: "ws",
-      host: "localhost",
-    },
+    hmr: host === "localhost" ? { protocol: "ws", host: "localhost" } : { protocol: "ws" },
   },
   build: {
     outDir: "dist",

turbo.json

@@ -12,6 +12,7 @@
     "T3CODE_HOME",
     "T3CODE_AUTH_TOKEN",
     "T3CODE_DESKTOP_WS_URL",
+    "T3CODE_HOST",
     "T3CODE_TRACE_MIN_LEVEL",
     "T3CODE_TRACE_TIMING_ENABLED",
     "T3CODE_TRACE_FILE",