updated no more strict port binding for development and preview, added prestart script to build before previewing

README.md

@@ -27,7 +27,7 @@ npm install
 npm start
 ```
 
-4. Open `http://localhost:4173`.
+4. Open the local URL printed in the terminal. By default it starts on `http://localhost:4173`, but it will move to the next free port if that one is already in use.
 
 On a fresh install the app opens the Hydrus server settings first. Add your host, port, and API key there, test the connection, then save the server before browsing the library. Playback itself is always external, so actual media launch still depends on the platform-specific player flow below.
 
@@ -117,6 +117,8 @@ http://localhost:4173/userscripts/api-media-player-open-in-mpv.user.js
 http://127.0.0.1:4173/userscripts/api-media-player-open-in-mpv.user.js
 ```
 
+If preview chooses a different port because `4173` is busy, use that same port for the userscript URL too.
+
 It only activates on `localhost`, loopback, RFC1918 LAN IPs, and `.local` or `.lan` hosts. On desktop it redirects to `mpv-handler://...`; on Android it redirects to the `mpv` app through `intent://...`.
 
 ## Useful commands

package.json

@@ -6,7 +6,7 @@
   "scripts": {
     "dev": "vite --host 0.0.0.0",
     "prestart": "vite build",
-    "start": "vite preview --host 0.0.0.0 --strictPort --port 4173",
+    "start": "vite preview --host 0.0.0.0 --port 4173",
     "build": "vite build",
     "preview": "vite preview --host 0.0.0.0",
     "typecheck": "tsc --noEmit",