Add desktop app service and VM dev session tooling

Introduces a new `core/applications` QML/C++ module (`Nebula.Applications`) to discover `.desktop` entries, expose filterable application models, and launch installed apps safely from the shell. The desktop launcher now uses real installed apps with themed icon loading and fallback glyphs, adds output-aware surface sizing via `OutputTracker`, and wires in image/icon providers. It also adds VMware-focused Sway/shell wrapper scripts, updates Sway config/session env defaults, and refreshes README docs to document the new development flow and Desktop 0.1 behavior.

shells/desktop/shell/CMakeLists.txt

@@ -25,8 +25,15 @@ add_subdirectory(
     "${CMAKE_CURRENT_BINARY_DIR}/nebula-ui"
 )
 
+add_subdirectory(
+    "${CMAKE_CURRENT_SOURCE_DIR}/../../../core/applications"
+    "${CMAKE_CURRENT_BINARY_DIR}/nebula-applications"
+)
+
 qt_add_executable(nebula-shell
     src/main.cpp
+    src/DesktopIconProvider.cpp
+    src/DesktopIconProvider.hpp
 )
 
 set(NEBULA_SHELL_QML_FILES
@@ -65,9 +72,13 @@ qt_add_qml_module(nebula-shell
     VERSION 1.0
     RESOURCE_PREFIX /qt/qml
     QML_FILES ${NEBULA_SHELL_QML_FILES}
+    SOURCES
+        src/OutputTracker.hpp
+        src/OutputTracker.cpp
     DEPENDENCIES
         QtQuick
         Nebula.UI
+        Nebula.Applications
 )
 
 target_link_libraries(nebula-shell
@@ -78,11 +89,15 @@ target_link_libraries(nebula-shell
         Qt6::Quick
         LayerShellQt::Interface
         NebulaUI
+        NebulaApplications
 )
 
 if(TARGET NebulaUIplugin)
     target_link_libraries(nebula-shell PRIVATE NebulaUIplugin)
 endif()
+if(TARGET NebulaApplicationsplugin)
+    target_link_libraries(nebula-shell PRIVATE NebulaApplicationsplugin)
+endif()
 
 set_target_properties(nebula-shell PROPERTIES
     OUTPUT_NAME nebula-shell