Tiling Shell is a GNOME Shell extension that provides advanced window tiling and management, inspired by Windows 11 snap assistant and modern tiling window managers. It overrides native AltTab and window menu popups, adds a panel indicator with layout selection, and includes a graphical layout editor. The extension supports per-monitor and per-workspace layouts, edge tiling (default, adaptive, granular), auto-tiling, snap assistant on drag, keyboard shortcuts, and window suggestions. It also exposes a DBus interface for external control and allows import/export of settings and layouts. Architecturally, the extension is built as a standard GNOME Shell extension with a main lifecycle class in `src/extension.ts`. It uses per-monitor tiling managers (`TilingManager`, `EdgeTilingManager`) that handle grab operations, edge detection, and layout updates. Layouts are represented by pure data classes (`Tile`, `Layout`) and rendered via a generic `LayoutWidget` base class used across snap assistant, indicator buttons, window menu icons, and AltTab previews. Settings are managed through GSettings with a singleton `Settings` class, and a `SettingsOverride` mechanism temporarily modifies native GNOME keybindings. The codebase is written in TypeScript, compiled with esbuild, and supports GNOME Shell 42–51 with conditional polyfills for legacy versions. Key entry points include the extension enable/disable lifecycle, keyboard shortcut definitions in `src/keybindings.ts`, the preferences dialog built with Adw (`src/prefs.ts`), and the panel indicator (`src/indicator/indicator.ts`). External dependencies are limited to GNOME Shell libraries (Meta, Clutter, St, Gio, GLib, Gtk, Adw, Shell) and a subprocess for monitor description detection. The extension does not rely on any external services or databases; all configuration is stored locally via GSettings. The codebase is large (60+ source files) and heavily interconnected, with many version-specific workarounds and some deprecated API usage, indicating a medium level of technical drift.