Prepare Windows portable packaging

DataLoom.spec

@@ -0,0 +1,33 @@
+# PyInstaller one-file Windows build configuration.
+# Build from the repository root with: pyinstaller --clean --noconfirm DataLoom.spec
+
+from PyInstaller.utils.hooks import collect_submodules
+
+hiddenimports = collect_submodules("PySide6")
+
+a = Analysis(
+    ["src/dataloom/app.py"],
+    pathex=["src"],
+    binaries=[],
+    datas=[],
+    hiddenimports=hiddenimports,
+    hookspath=[],
+    hooksconfig={},
+    runtime_hooks=[],
+    excludes=[],
+    noarchive=False,
+)
+pyz = PYZ(a.pure)
+exe = EXE(
+    pyz,
+    a.scripts,
+    a.binaries,
+    a.datas,
+    [],
+    name="DataLoom",
+    debug=False,
+    bootloader_ignore_signals=False,
+    strip=False,
+    upx=True,
+    console=False,
+)