Implement posix app loading (#643)

- Added POSIX desktop support for SDK builds, application packaging, and integration testing.
- Added POSIX filesystem partitions and improved application path handling.
- Added simulator support for loading and running applications dynamically.
- Improved simulator task stack handling and display startup reliability.
- Improved simulator display scaling, resizing, high-DPI support, and pointer accuracy.
- Fixed LVGL timers and input polling on POSIX. (fixes simulator with Linux on some Intel graphics platforms)
- Standardized data paths across platforms.
- Logging now works via separate task: this allows apps to write to log without it affecting their stdout (for apps that output text as relevant date for other apps, like the File Selection app)
- Fixes for app stdio

Tactility/Source/MountPoints.cpp

@@ -18,7 +18,11 @@ std::vector<dirent> getFileSystemDirents() {
         if (!file_system_is_mounted(fs)) return true;
         char path[128];
         if (file_system_get_path(fs, path, sizeof(path)) != ERROR_NONE) return true;
-        auto mount_name = std::string(path).substr(1);
+        // ESP32 mount paths are short names ("/system"); POSIX file systems can return a full
+        // absolute host path instead, so take the last path component either way.
+        auto path_str = std::string(path);
+        auto slash_pos = path_str.find_last_of('/');
+        auto mount_name = slash_pos == std::string::npos ? path_str : path_str.substr(slash_pos + 1);
         if (!config::SHOW_SYSTEM_PARTITION && mount_name.starts_with(SYSTEM_PARTITION_NAME)) return true;
         auto dir_entry = dirent {
             .d_ino = 2,