Use CFBundleIconFile to reference root AppIcon.icon

This ensures the app icon from /AppIcon.icon is used instead of asset catalog.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: hi2gage

Config/Shared.xcconfig

@@ -5,7 +5,7 @@
 
 // MARK: - Product Info
 PRODUCT_NAME = BuildSignal
-MARKETING_VERSION = 0.0.3
+MARKETING_VERSION = 0.0.4
 CURRENT_PROJECT_VERSION = 1
 
 // MARK: - Deployment
@@ -15,8 +15,7 @@ MACOSX_DEPLOYMENT_TARGET = 15.0
 SWIFT_VERSION = 6.0
 
 // MARK: - App Icon
-ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon
-INFOPLIST_KEY_CFBundleIconName = AppIcon
+INFOPLIST_KEY_CFBundleIconFile = AppIcon
 
 // MARK: - Other Settings
 GENERATE_INFOPLIST_FILE = YES