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.

core/applications/CMakeLists.txt

@@ -0,0 +1,44 @@
+cmake_minimum_required(VERSION 3.20)
+
+if(NOT TARGET Qt6::Qml)
+    project(NebulaApplications LANGUAGES CXX)
+    find_package(Qt6 6.4 REQUIRED COMPONENTS Core Gui Qml)
+    qt_standard_project_setup(REQUIRES 6.4)
+endif()
+
+qt_add_library(NebulaApplications STATIC)
+
+qt_add_qml_module(NebulaApplications
+    URI Nebula.Applications
+    VERSION 1.0
+    RESOURCE_PREFIX /qt/qml
+    SOURCES
+        DesktopEntry.hpp
+        DesktopEntry.cpp
+        ApplicationModel.hpp
+        ApplicationModel.cpp
+        ApplicationFilterModel.hpp
+        ApplicationFilterModel.cpp
+        ApplicationService.hpp
+        ApplicationService.cpp
+)
+
+target_include_directories(NebulaApplications
+    PUBLIC
+        "${CMAKE_CURRENT_SOURCE_DIR}"
+)
+
+target_link_libraries(NebulaApplications
+    PUBLIC
+        Qt6::Core
+        Qt6::Gui
+        Qt6::Qml
+)
+
+set_target_properties(NebulaApplications PROPERTIES
+    AUTOMOC ON
+)
+
+if(CMAKE_CXX_COMPILER_ID MATCHES "GNU|Clang")
+    target_compile_options(NebulaApplications PRIVATE -Wall -Wextra)
+endif()