huge optimisations (see below). Build with c++26 and c23.

- build with c++26 and c23, fixes warnings due to this change.
- use #embed over romfs where applicable.
- load all configs upfront in the app menu, massively improves boot time
- enable boost mode during load/scan time in all (slow loading) menus, huge load time improvement.
- enable boost mode when exiting the app, to speed up closing all the menus and saving the config.
- reduce the size of the nro nacp when loading to just the title + author + display version.
- add option to enable boost mode for all progress bar menus, huge perf improvement again.
- remove unused launch_count var from the playlog file.
- display full path when dumping.
- optimise appstore unzip code by iterating through the zip rather than finding a specific file, reduces retroarch extract time from 52s to 26s.

overall, this commit has reduced boot time from 0.4s to 0.3s and massively increased load times of other menus.
(it also reduced the binary size by 4kb, so yay)

sphaira/include/app.hpp

@@ -69,6 +69,7 @@ public:
     static auto GetThemeIndex() -> s64;
 
     static auto GetDefaultImage() -> int;
+    static auto GetDefaultImageData() -> std::span<const u8>;
 
     // returns argv[0]
     static auto GetExePath() -> fs::FsPath;
@@ -196,6 +197,7 @@ public:
     static constexpr inline auto CONFIG_PATH = "/config/sphaira/config.ini";
     static constexpr inline auto PLAYLOG_PATH = "/config/sphaira/playlog.ini";
     static constexpr inline auto INI_SECTION = "config";
+    static constexpr inline auto DEFAULT_THEME_PATH = "romfs:/themes/abyss_theme.ini";
 
     fs::FsPath m_app_path;
     u64 m_start_timestamp{};
@@ -229,17 +231,18 @@ public:
     option::OptionBool m_hdd_enabled{INI_SECTION, "hdd_enabled", false};
     option::OptionBool m_log_enabled{INI_SECTION, "log_enabled", false};
     option::OptionBool m_replace_hbmenu{INI_SECTION, "replace_hbmenu", false};
+    option::OptionString m_theme_path{INI_SECTION, "theme", DEFAULT_THEME_PATH};
     option::OptionBool m_theme_music{INI_SECTION, "theme_music", true};
     option::OptionBool m_12hour_time{INI_SECTION, "12hour_time", false};
     option::OptionLong m_language{INI_SECTION, "language", 0}; // auto
     option::OptionString m_right_side_menu{INI_SECTION, "right_side_menu", "Appstore"};
+    option::OptionBool m_progress_boost_mode{INI_SECTION, "progress_boost_mode", false};
 
     // install options
     option::OptionBool m_install_sysmmc{INI_SECTION, "install_sysmmc", false};
     option::OptionBool m_install_emummc{INI_SECTION, "install_emummc", false};
     option::OptionBool m_install_sd{INI_SECTION, "install_sd", true};
     option::OptionLong m_install_prompt{INI_SECTION, "install_prompt", true};
-    option::OptionLong m_boost_mode{INI_SECTION, "boost_mode", false};
     option::OptionBool m_allow_downgrade{INI_SECTION, "allow_downgrade", false};
     option::OptionBool m_skip_if_already_installed{INI_SECTION, "skip_if_already_installed", true};
     option::OptionBool m_ticket_only{INI_SECTION, "ticket_only", false};