Fix Windows build: Use collect_all for FastAPI packages

- On Windows, PyInstaller wasn't properly bundling FastAPI dependencies
- Added platform-specific collection using PyInstaller.utils.hooks.collect_all
- Only applies aggressive collection on Windows to keep Linux builds stable
- Collects all submodules and data files for: fastapi, starlette, pydantic,
  pydantic_core, anyio, uvicorn, websockets, h11
- Linux builds remain unchanged and continue to work as before

Fixes: ModuleNotFoundError: No module named 'fastapi' on Windows executable

local-transcription.spec

@@ -10,19 +10,21 @@ block_cipher = None
 # Determine if we're on Windows
 is_windows = sys.platform == 'win32'
 
+# Import PyInstaller utilities (only needed on Windows for FastAPI fix)
+if is_windows:
+    from PyInstaller.utils.hooks import collect_all
+
 # Find faster_whisper assets folder
 import faster_whisper
 faster_whisper_path = os.path.dirname(faster_whisper.__file__)
 vad_assets_path = os.path.join(faster_whisper_path, 'assets')
 
-a = Analysis(
-    ['main.py'],
-    pathex=[],
-    binaries=[],
+# Base configuration
+binaries = []
 datas = [
     ('config/default_config.yaml', 'config'),
     (vad_assets_path, 'faster_whisper/assets'),  # Include VAD model
-    ],
+]
 hiddenimports = [
     'PySide6.QtCore',
     'PySide6.QtWidgets',
@@ -78,7 +80,28 @@ a = Analysis(
     'urllib3',
     'certifi',
     'charset_normalizer',
-    ],
+]
+
+# On Windows, use more aggressive collection for FastAPI packages
+# This fixes import errors on Windows while keeping Linux builds stable
+if is_windows:
+    print("Windows build: Using collect_all for FastAPI packages...")
+    for package in ['fastapi', 'starlette', 'pydantic', 'pydantic_core', 'anyio', 'uvicorn', 'websockets', 'h11']:
+        try:
+            tmp_datas, tmp_binaries, tmp_hiddenimports = collect_all(package)
+            datas += tmp_datas
+            binaries += tmp_binaries
+            hiddenimports += tmp_hiddenimports
+            print(f"  ✓ Collected {package}")
+        except Exception as e:
+            print(f"  ⚠ Warning: Could not collect {package}: {e}")
+
+a = Analysis(
+    ['main.py'],
+    pathex=[],
+    binaries=binaries,
+    datas=datas,
+    hiddenimports=hiddenimports,
     hookspath=[],
     hooksconfig={},
     runtime_hooks=[],