Add project infrastructure and core application files

Add .gitignore, GitLab CI pipeline with test/lint/build/release stages, project documentation (README, LICENSE, CHANGELOG, CONTRIBUTING, SECURITY), PyInstaller packaging configuration with icon and version info, Python project configuration with dependencies, and complete application source including battery provider, device discovery, settings management, UI components, startup control, and comprehensive test suite

packaging/icon.svg

@@ -0,0 +1,6 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="256" height="256" viewBox="0 0 256 256">
+  <rect width="256" height="256" rx="52" fill="#17191f"/>
+  <rect x="42" y="69" width="156" height="118" rx="24" fill="#f5f7fa"/>
+  <rect x="198" y="105" width="20" height="46" rx="8" fill="#f5f7fa"/>
+  <rect x="58" y="85" width="105" height="86" rx="14" fill="#2cc970"/>
+</svg>

packaging/launcher.py

@@ -0,0 +1,6 @@
+"""Absolute-import launcher used by PyInstaller."""
+
+from logitech_battery_widget.main import main
+
+if __name__ == "__main__":
+    raise SystemExit(main())

packaging/pyinstaller.spec

@@ -0,0 +1,39 @@
+# -*- mode: python ; coding: utf-8 -*-
+from pathlib import Path
+
+root = Path(SPECPATH).parent
+
+a = Analysis(
+    [str(root / "packaging" / "launcher.py")],
+    pathex=[str(root / "src")],
+    binaries=[],
+    datas=[],
+    hiddenimports=[
+        "PyQt6.QtCore",
+        "PyQt6.QtGui",
+        "PyQt6.QtWidgets",
+        "hid",
+        "logitech_battery_widget.battery.windows_hid",
+    ],
+    hookspath=[],
+    runtime_hooks=[],
+    excludes=[],
+    noarchive=False,
+    optimize=1,
+)
+pyz = PYZ(a.pure)
+exe = EXE(
+    pyz,
+    a.scripts,
+    a.binaries,
+    a.datas,
+    [],
+    name="LogitechBatteryWidget",
+    debug=False,
+    bootloader_ignore_signals=False,
+    strip=False,
+    upx=False,
+    console=False,
+    icon=str(root / "packaging" / "icon.ico"),
+    version=str(root / "packaging" / "version_info.txt"),
+)

packaging/version_info.txt

@@ -0,0 +1,12 @@
+VSVersionInfo(
+  ffi=FixedFileInfo(filevers=(0, 1, 0, 0), prodvers=(0, 1, 0, 0),
+    mask=0x3f, flags=0x0, OS=0x40004, fileType=0x1, subtype=0x0, date=(0, 0)),
+  kids=[StringFileInfo([StringTable('040904B0', [
+    StringStruct('CompanyName', 'Logitech Battery Widget contributors'),
+    StringStruct('FileDescription', 'Offline Logitech battery status widget'),
+    StringStruct('FileVersion', '0.1.0'),
+    StringStruct('InternalName', 'LogitechBatteryWidget'),
+    StringStruct('LegalCopyright', 'Copyright (c) 2026 contributors'),
+    StringStruct('OriginalFilename', 'LogitechBatteryWidget.exe'),
+    StringStruct('ProductName', 'Logitech Battery Widget'),
+    StringStruct('ProductVersion', '0.1.0')])]), VarFileInfo([VarStruct('Translation', [1033, 1200])])])