Import theme from roblox and fix x11

vkAcquireNextImageKHR(): A swapchain no longer matches the surface properties exactly, but can still be used to present to the surface successfully. (VK_SUBOPTIMAL_KHR) (1000001003)

include/runtime/platform_cache_migration.h

@@ -3,6 +3,7 @@
 
 #include <cstdint>
 #include <filesystem>
+#include <optional>
 #include <string>
 #include <string_view>
 
@@ -38,6 +39,20 @@ PlatformCacheMigrationResult MigratePlatformProfileCaches(
     const Environment& environment, const RuntimePaths& paths,
     std::string_view desired_revision);
 
+struct RobloxThemeCacheResult {
+  std::optional<bool> dark_theme;
+  std::string error;
+
+  explicit operator bool() const { return error.empty(); }
+};
+
+// Reads the current account's Roblox theme without changing appStorage. A
+// missing value leaves dark_theme empty so the caller can use Roblox's own
+// startup default.
+RobloxThemeCacheResult ReadRobloxThemeCache(
+    const std::filesystem::path& app_storage_file,
+    std::int64_t authenticated_user_id);
+
 // Synchronizes only Roblox's local theme keys with the resolved host theme.
 bool ApplyRobloxThemeCacheOverride(
     const std::filesystem::path& app_storage_file,

include/runtime/roblox_desktop_app_policy.h

@@ -20,14 +20,15 @@ struct DesktopAppPolicyResult {
   explicit operator bool() const { return error.empty(); }
 };
 
-// Normalizes only Roblox UniversalApp layout coordinates for a PC profile.
-// Account eligibility and feature-entitlement fields remain server-owned.
+// Normalizes Roblox UniversalApp layout coordinates for a PC profile and
+// applies a fixed theme only when configured. Account eligibility and
+// feature-entitlement fields remain server-owned.
 // The guest and authenticated cache keys are both populated so user-switch
 // startup cannot fall back to the Android Unknown/mobile layout.
 DesktopAppPolicyResult ApplyDesktopAppPolicy(
     const std::filesystem::path& app_storage_file,
     const std::filesystem::path& default_policy_file,
-    std::int64_t authenticated_user_id);
+    std::int64_t authenticated_user_id, std::string_view theme_mode);
 
 // Routes the normalized policy through Roblox's supported runtime override so
 // a later GUAC response cannot replace the in-memory desktop layout with the

include/runtime/runtime_config.h

@@ -87,8 +87,8 @@ class RuntimeConfig {
   const WindowConfig& window() const { return window_; }
   const std::string& theme_mode() const { return theme_mode_; }
   bool theme_mode_valid() const {
-    return theme_mode_ == "system" || theme_mode_ == "light" ||
-           theme_mode_ == "dark";
+    return theme_mode_ == "roblox" || theme_mode_ == "system" ||
+           theme_mode_ == "light" || theme_mode_ == "dark";
   }
   const InputCapabilityConfig& input_capabilities() const {
     return input_capabilities_;
@@ -139,7 +139,7 @@ class RuntimeConfig {
   GraphicsBackend graphics_backend_ = GraphicsBackend::kVulkan;
   std::string graphics_backend_name_ = "direct-vulkan";
   WindowConfig window_;
-  std::string theme_mode_ = "system";
+  std::string theme_mode_ = "roblox";
   InputCapabilityConfig input_capabilities_;
   DeviceProfile device_profile_ = *FindDeviceProfile(kDefaultDeviceProfileName);
   bool device_profile_valid_ = true;