fix(companion): resolve fixtures path correctly for both dev and built modes

apps/companion/main/di-container.ts

@@ -20,29 +20,30 @@ import type { IFixtureServerService } from '@/packages/infrastructure/adapters/a
 
 /**
  * Resolve the fixtures path relative to the monorepo root.
- * In Electron, app.getAppPath() returns the path to the app's main directory
- * (e.g., apps/companion/dist/main in development, or the asar in production).
- * We navigate up to find the monorepo root and then join with the resources path.
+ * Uses __dirname to determine the navigation depth based on whether we're
+ * running from source (dev mode) or built output (dist mode).
  *
- * Path breakdown from apps/companion/dist/main:
- * - Level 1: apps/companion/dist (../)
- * - Level 2: apps/companion (../../)
- * - Level 3: apps (../../../)
- * - Level 4: gridpilot (monorepo root) (../../../../)
+ * Path breakdown:
+ * - Dev mode: apps/companion/main → 3 levels to root
+ * - Built mode: apps/companion/dist/main → 4 levels to root
  *
  * @param configuredPath - The path configured (may be relative or absolute)
- * @param appPath - The app path from electron (app.getAppPath())
+ * @param dirname - The directory name (__dirname) of the calling module
  * @returns Resolved absolute path
  */
-export function resolveFixturesPath(configuredPath: string, appPath: string): string {
+export function resolveFixturesPath(configuredPath: string, dirname: string): string {
   if (path.isAbsolute(configuredPath)) {
     return configuredPath;
   }
   
-  const projectRoot = path.resolve(appPath, '../../../../');
-  const resolvedPath = path.join(projectRoot, configuredPath);
+  // Determine navigation depth based on whether we're in dist/ or source
+  // Dev mode: apps/companion/main → 3 levels to root
+  // Built mode: apps/companion/dist/main → 4 levels to root
+  const isBuiltMode = dirname.includes(`${path.sep}dist${path.sep}`);
+  const levelsUp = isBuiltMode ? '../../../../' : '../../../';
+  const projectRoot = path.resolve(dirname, levelsUp);
   
-  return resolvedPath;
+  return path.join(projectRoot, configuredPath);
 }
 
 export interface BrowserConnectionResult {
@@ -196,10 +197,10 @@ export class DIContainer {
 
   /**
    * Resolve the fixtures path relative to the monorepo root.
-   * Uses the exported resolveFixturesPath function with app.getAppPath().
+   * Uses the exported resolveFixturesPath function with __dirname.
    */
   private resolveFixturesPathInternal(configuredPath: string): string {
-    return resolveFixturesPath(configuredPath, app.getAppPath());
+    return resolveFixturesPath(configuredPath, __dirname);
   }
 
   /**
@@ -226,7 +227,7 @@ export class DIContainer {
 
     this.logger.debug('Fixture server path resolution', {
       configuredPath: config.fixtureServer.fixturesPath,
-      appPath: app.getAppPath(),
+      dirname: __dirname,
       resolvedPath: fixturesPath
     });