Add optional dependencies to Brewfile and improve CMake configuration

This commit updates the Brewfile to include additional optional dependencies such as Vulkan headers, RapidJSON, and various libraries for enhanced functionality. It also modifies CMake files to make the handling of optional components more user-friendly, allowing missing dependencies to disable features without causing build failures on macOS. Additionally, it refines the search paths for the Sparkle framework and adjusts the linking of the discord-rpc library based on the availability of RapidJSON.

Formula/qtsparkle-qt6.rb

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+class QtsparkleQt6 < Formula
+  desc "Qt wrapper library for in-app updates (Qt 6 build)"
+  homepage "https://github.com/strawberrymusicplayer/qtsparkle"
+  url "https://github.com/strawberrymusicplayer/qtsparkle/archive/95ca3b77a79540d632b29e9a4df9aed30af5f901.tar.gz"
+  sha256 "945c9e96d2f6175b134a8ccfd6ec1acd268266d31969b5870d4037e8e5877834"
+  license "GPL-3.0-or-later"
+
+  depends_on "cmake" => :build
+  depends_on "ninja" => :build
+  depends_on "qt"
+
+  def install
+    args = std_cmake_args + %W[
+      -GNinja
+      -DBUILD_WITH_QT6=ON
+      -DBUILD_WITH_QT5=OFF
+      -DBUILD_SHARED_LIBS=ON
+      -DBUILD_STATIC_LIBS=OFF
+    ]
+
+    system "cmake", "-S", ".", "-B", "build", *args
+    system "cmake", "--build", "build"
+    system "cmake", "--install", "build"
+  end
+
+  test do
+    # Strawberry expects: find_package(qtsparkle-qt6) and target qtsparkle-qt6::qtsparkle
+    (testpath/"CMakeLists.txt").write <<~CMAKE
+      cmake_minimum_required(VERSION 3.16)
+      project(qtsparkle_test LANGUAGES CXX)
+      find_package(qtsparkle-qt6 CONFIG REQUIRED)
+      add_library(dummy STATIC dummy.cpp)
+      target_link_libraries(dummy PRIVATE qtsparkle-qt6::qtsparkle)
+    CMAKE
+
+    (testpath/"dummy.cpp").write <<~CPP
+      int dummy() { return 0; }
+    CPP
+
+    system "cmake", "-S", ".", "-B", "build",
+           "-DCMAKE_PREFIX_PATH=#{opt_prefix}"
+    system "cmake", "--build", "build"
+  end
+end
+

Formula/qtsparkle-qt6/README.md

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+# qtsparkle-qt6 (local Homebrew formula)
+
+This installs Strawberry’s Qt updater helper library as a CMake package:
+
+- `find_package(qtsparkle-qt6 CONFIG REQUIRED)`
+- target: `qtsparkle-qt6::qtsparkle`
+
+Strawberry will pick it up automatically when present and enable the optional
+**QtSparkle integration**.
+

Formula/sparkle-framework.rb

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+class SparkleFramework < Formula
+  desc "Sparkle.framework for macOS app updates (framework-only packaging)"
+  homepage "https://sparkle-project.org/"
+  url "https://github.com/sparkle-project/Sparkle/releases/download/2.8.1/Sparkle-2.8.1.tar.xz"
+  sha256 "5cddb7695674ef7704268f38eccaee80e3accbf19e61c1689efff5b6116d85be"
+  license "MIT"
+
+  depends_on :macos
+
+  def install
+    frameworks = prefix/"Frameworks"
+    frameworks.install "Sparkle.framework"
+  end
+
+  test do
+    assert_predicate prefix/"Frameworks/Sparkle.framework", :exist?
+  end
+end
+

Formula/sparkle-framework/README.md

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+# sparkle-framework (local Homebrew formula)
+
+Installs the upstream `Sparkle.framework` into:
+
+- `$(brew --prefix sparkle-framework)/Frameworks/Sparkle.framework`
+
+This is used to enable Strawberry’s optional **Sparkle integration** on macOS
+(`find_library(SPARKLE Sparkle)` in the main `CMakeLists.txt`).
+