feat: support Linux. Refactor resources architecture. Create build script

Currently, themes are disabled and firefox notification too.

app/dependencyCheck.js

@@ -25,15 +25,19 @@ function checkNativeDependencies() {
    */
   const { binaryPaths } = require("../server/helpers/path.helpers");
 
+  const isWindows = process.platform === "win32";
+
+  const addExe = isWindows ? ".exe" : "";
+
   /**
    * List of required external executables used by the application runtime.
    * Each entry defines a binary name and its resolved absolute path.
    */
   const deps = [
-    { name: "yt-dlp.exe",  path: binaryPaths.ytDlp },
-    { name: "ffmpeg.exe",  path: binaryPaths.ffmpeg },
-    { name: "ffprobe.exe", path: binaryPaths.ffprobe },
-    { name: "deno.exe",    path: binaryPaths.deno },
+    { name: `yt-dlp${addExe}`,  path: binaryPaths.ytDlp },
+    { name: `ffmpeg${addExe}`,  path: binaryPaths.ffmpeg },
+    { name: `ffprobe${addExe}`, path: binaryPaths.ffprobe },
+    { name: `deno${addExe}`,    path: binaryPaths.deno },
   ];
 
   const missing = deps.filter(d => !fs.existsSync(d.path));
@@ -52,7 +56,7 @@ function checkNativeDependencies() {
   app.whenReady().then(() => {
     dialog.showErrorBox(
       "Missing dependencies",
-      `The following files are missing in the 'ressources' folder:\n${list}\n\nThe application will now exit. Try to reinstall.`
+      `The following files are missing in the 'resources' folder:\n${list}\n\nThe application will now exit. Try to reinstall.`
     );
     app.quit();
   });

app/pathValidator.js

@@ -62,10 +62,19 @@ function validateDownloadPath(userPath) {
      * Required to prevent path traversal or alias bypass.
      */
     const resolved = fs.realpathSync(path.resolve(userPath));
+
+    if (!fs.existsSync(resolved)) {
+      fs.mkdirSync(resolved, { recursive: true });
+      logger.info(`Download folder created: ${resolved}`);
+    }
+
+    const real = fs.realpathSync(resolved);
+
     if (!isSafePath(resolved)) {
       throw new Error("Path not allowed: system folders are blocked!");
     }
-    return resolved;
+
+    return real;
   }
   catch (err) {