fix: migrate config from old paths on first launch

Checks alternate AppData folder names and portable exe directory
to find existing config when current path has no config file.
Prevents losing accounts, settings, and queue after updates.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

lib/config-store.js

@@ -52,6 +52,34 @@ class ConfigStore {
       ? app.getPath('userData')
       : path.join(__dirname, '..');
     this.filePath = path.join(dir, 'electron-config.json');
+
+    // Migrate config from old location if current doesn't exist
+    if (!fs.existsSync(this.filePath) && app && app.isPackaged) {
+      this._migrateFromOldPath(app);
+    }
+  }
+
+  _migrateFromOldPath(app) {
+    try {
+      const appDataDir = path.dirname(app.getPath('userData'));
+      // Check alternate folder names that may have been used
+      const candidates = ['multi-hoster-uploader', 'Multi-Hoster-Upload'];
+      for (const name of candidates) {
+        const oldPath = path.join(appDataDir, name, 'electron-config.json');
+        if (oldPath !== this.filePath && fs.existsSync(oldPath)) {
+          fs.mkdirSync(path.dirname(this.filePath), { recursive: true });
+          fs.copyFileSync(oldPath, this.filePath);
+          return;
+        }
+      }
+      // Also check next to the executable (portable mode previous location)
+      const exeDir = path.dirname(app.getPath('exe'));
+      const portablePath = path.join(exeDir, 'electron-config.json');
+      if (portablePath !== this.filePath && fs.existsSync(portablePath)) {
+        fs.mkdirSync(path.dirname(this.filePath), { recursive: true });
+        fs.copyFileSync(portablePath, this.filePath);
+      }
+    } catch {}
   }
 
   load() {