refactor: remove dead StartMenuMonitor and correct OVERVIEW's fallback description

docs/OVERVIEW.md

@@ -34,7 +34,7 @@ Fluid.Avalonia must live in `Application.Styles` to theme composite controls (e.
 ## How it works — notable mechanisms
 
 **Activation**
-- *Start-button / Win-tap interception* — the taskbar Start-button **click** is caught by a managed low-level mouse hook (`StartClickHook`). The lone **Win-tap**, which on Win 11 24H2 only surfaces *inside* the shell, is caught by the optional native bridge (`MenYou.Bridge`, C++): `BridgeInjector` installs a `WH_GETMESSAGE` hook on Explorer's UI thread via the bridge DLL and forwards `WM_COPYDATA` to `CopyDataListener`. The hook is **owned by MenYou** — so Windows unloads the DLL from Explorer when MenYou exits or is killed — and the DLL ships next to `MenYou.exe` but is **shadow-copied** to `%LocalAppData%\MenYou\bridge\` before injection, so an in-place upgrade never finds Explorer holding the installed copy. If MSVC isn't installed the DLL is absent and MenYou falls back to a managed WinEvent monitor (`StartMenuMonitor`).
+- *Start-button / Win-tap interception* — the taskbar Start-button **click** is caught by a managed low-level mouse hook (`StartClickHook`). The lone **Win-tap** is caught twice over: a managed low-level keyboard hook (`WinKeyHook`) swallows the real Win-down/up (buffer-and-replay, so combos still work) and fires MenYou on a lone tap, while the optional native bridge (`MenYou.Bridge`, C++) covers the tap as it surfaces *inside* the shell on Win 11 24H2: `BridgeInjector` installs a `WH_GETMESSAGE` hook on Explorer's UI thread via the bridge DLL and forwards `WM_COPYDATA` to `CopyDataListener`. The hook is **owned by MenYou** — so Windows unloads the DLL from Explorer when MenYou exits or is killed — and the DLL ships next to `MenYou.exe` but is **shadow-copied** to `%LocalAppData%\MenYou\bridge\` before injection, so an in-place upgrade never finds Explorer holding the installed copy. If MSVC isn't installed the DLL is absent, injection quietly no-ops, and the managed hooks carry the interception alone.
 - *Shift+Win hotkey* — registered via `RegisterHotKey`. Bare Win can't be reliably intercepted from outside the shell on Win 11 24H2, so Shift+Win is the toggle (the approach Open-Shell also recommends).
 - *Foreground activation* — Win 11's focus-stealing prevention leaves a freshly shown window inactive, so `Win32Foreground.Bring` does the `AttachThreadInput` → `SetForegroundWindow` dance.
 - *Window sizing re-measure* — the five layouts are stacked in one `SizeToContent` window gated by `IsVisible`; `ShowMenu` toggles `SizeToContent` after bindings resolve so the window fits only the active layout.
@@ -76,7 +76,7 @@ dotnet build src/MenYou/MenYou.csproj
 src/MenYou/bin/Debug/net10.0-windows/MenYou.exe
 ```
 
-The `BuildNativeBridge` MSBuild target runs `tools/build-bridge.ps1` first; it locates VS's `msbuild` via `vswhere` and exits 0 if MSVC is missing (MenYou then runs on the managed fallback). Companion `CopyNativeBridge*` targets copy the built `MenYou.Bridge.dll` next to `MenYou.exe` for both `dotnet build` and `dotnet publish`, so it ships in the installer. A tray icon appears on launch — press **Shift+Win** to toggle the menu.
+The `BuildNativeBridge` MSBuild target runs `tools/build-bridge.ps1` first; it locates VS's `msbuild` via `vswhere` and exits 0 if MSVC is missing (MenYou then runs on the managed hooks alone). Companion `CopyNativeBridge*` targets copy the built `MenYou.Bridge.dll` next to `MenYou.exe` for both `dotnet build` and `dotnet publish`, so it ships in the installer. A tray icon appears on launch — press **Shift+Win** to toggle the menu.
 
 ## Branding