fix: remove Unicode symbols from PyInstaller spec files

Replace ✓ and ⚠ with [OK] and [WARNING] to fix Windows encoding error.
Windows cp1252 codec cannot encode these Unicode characters.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: 777genius

packaging/launcher-linux.spec

@@ -16,9 +16,9 @@ FLUTTER_APP = os.path.join(ROOT, 'frontend_flutter', 'build', 'linux', 'x64', 'r
 if os.path.exists(FLUTTER_APP):
     # Bundle entire Flutter bundle folder
     datas.append((FLUTTER_APP, 'flutter_app'))
-    print(f"✓ Including Flutter app: {FLUTTER_APP}")
+    print(f"[OK] Including Flutter app: {FLUTTER_APP}")
 else:
-    print(f"⚠ Flutter app not found at: {FLUTTER_APP}")
+    print(f"[WARNING] Flutter app not found at: {FLUTTER_APP}")
     print("  You need to build Flutter first: cd frontend_flutter && flutter build linux --release")
 
 # Bundle version file

packaging/launcher-macos.spec

@@ -17,9 +17,9 @@ FLUTTER_APP = os.path.join(ROOT, 'frontend_flutter', 'build', 'macos', 'Build',
 if os.path.exists(FLUTTER_APP):
     # Bundle entire Flutter .app into Resources
     datas.append((FLUTTER_APP, 'flutter_app/frontend_flutter.app'))
-    print(f"✓ Including Flutter app: {FLUTTER_APP}")
+    print(f"[OK] Including Flutter app: {FLUTTER_APP}")
 else:
-    print(f"⚠ Flutter app not found at: {FLUTTER_APP}")
+    print(f"[WARNING] Flutter app not found at: {FLUTTER_APP}")
     print("  You need to build Flutter first: cd frontend_flutter && flutter build macos --release")
 
 # Bundle macOS sound assets

packaging/launcher-windows.spec

@@ -16,9 +16,9 @@ FLUTTER_APP = os.path.join(ROOT, 'frontend_flutter', 'build', 'windows', 'runner
 if os.path.exists(FLUTTER_APP):
     # Bundle entire Flutter Release folder
     datas.append((FLUTTER_APP, 'flutter_app'))
-    print(f"✓ Including Flutter app: {FLUTTER_APP}")
+    print(f"[OK] Including Flutter app: {FLUTTER_APP}")
 else:
-    print(f"⚠ Flutter app not found at: {FLUTTER_APP}")
+    print(f"[WARNING] Flutter app not found at: {FLUTTER_APP}")
     print("  You need to build Flutter first: cd frontend_flutter && flutter build windows --release")
 
 # Bundle version file