Initial release — PySide6 app for automatic GOG offline installer management

CHANGELOG.md

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+# Changelog
+
+## [1.0.0] — 2026-04-09
+
+### Features
+
+- GOG OAuth2 authentication — browser-based login, paste authorization code
+- Game library browser with checkboxes for management, DLCs as sub-items
+- Windows / Linux platform switcher in Library and Status tabs (games shown only for platforms where installers exist)
+- Per-language installer management — each language tracked independently, version comparison per language
+- Language selection tab — choose which languages to download globally
+- English-only mode — single toggle to skip language subfolders entirely
+- Bonus content support — soundtracks, wallpapers, manuals etc. stored in `GameName/Bonus/`
+- Per-game settings override — double-click any game in Library to configure languages, english-only and bonus per game
+- Folder name sanitization — strips ®, ™, replaces `:` with ` - `, collapses spaces
+- Version comparison — numeric dot-separated comparison with GOG suffix stripping; ambiguous versions ask user via dialog
+- Status tab — per-language version display, color-coded status (up to date, update available, not downloaded, unversioned)
+- Download with resume support (HTTP Range), real filename extracted from CDN URL
+- Prune old versions — keep N most recent, configurable per platform
+- Metadata integrity check — stale entries (manually deleted files) cleaned automatically on each check
+- Scan existing installers — detect already-downloaded files from correct folder structure and import into metadata
+- Version history dialog — double-click game in Status tab to see all downloaded versions with delete options
+- DLC installers stored in parent game's folder, not separate folders
+- Windows-only games do not download bonus content to Linux path and vice versa