chore: migrate to qt tray for all platforms (#5260)

docs/building.md

@@ -27,7 +27,6 @@ pkg install -y \
   devel/evdev-proto \
   devel/git \
   devel/libevdev \
-  devel/libnotify \
   devel/llvm19 \
   devel/ninja \
   devel/pkgconf \
@@ -102,6 +101,8 @@ dependencies=(
   "openssl@3"
   "opus"
   "pkg-config"
+  "qtbase"
+  "qtsvg"
 )
 brew install "${dependencies[@]}"
 ```
@@ -130,6 +131,8 @@ dependencies=(
   "ninja"
   "npm9"
   "pkgconfig"
+  "qt6-qtbase"
+  "qt6-qtsvg"
 )
 sudo port install "${dependencies[@]}"
 ```
@@ -174,6 +177,7 @@ dependencies=(
   "mingw-w64-${TOOLCHAIN}-openssl"
   "mingw-w64-${TOOLCHAIN}-opus"
   "mingw-w64-${TOOLCHAIN}-toolchain"
+  "mingw-w64-${TOOLCHAIN}-qt6-static"
 )
 if [[ "${MSYSTEM}" == "UCRT64" ]]; then
   dependencies+=(
@@ -185,6 +189,14 @@ fi
 pacman -S "${dependencies[@]}"
 ```
 
+The static Qt package is installed under a separate prefix. Add the following options when configuring a Windows
+build so Sunshine and Qt's third-party dependencies are linked statically:
+
+```bash
+-DCMAKE_PREFIX_PATH="${MINGW_PREFIX}/qt6-static" \
+-DSUNSHINE_USE_STATIC_QT=ON
+```
+
 To create a WiX installer, you also need to install [.NET](https://dotnet.microsoft.com/download).
 
 For ARM64: To build frontend, you also need to install [Node.JS](https://nodejs.org/en/download)