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/qml/components/Launcher.qml

@@ -1,5 +1,6 @@
 import QtQuick
 import Nebula.UI
+import Nebula.Applications
 
 Item {
     id: root
@@ -13,8 +14,9 @@ Item {
     Accessible.role: Accessible.Dialog
     Accessible.name: qsTr("Launcher")
 
+    readonly property bool usingInstalledApps: ApplicationService.count > 0
     readonly property bool searching: searchField.text.trim().length > 0
-    readonly property var filteredApps: {
+    readonly property var mockMatches: {
         const query = searchField.text.trim().toLowerCase()
         const apps = MockApps.apps
         if (!query)
@@ -24,6 +26,9 @@ Item {
             return haystack.indexOf(query) !== -1
         })
     }
+    readonly property int resultCount: usingInstalledApps
+        ? ApplicationService.filteredModel.count
+        : mockMatches.length
 
     Keys.onEscapePressed: {
         event.accepted = true
@@ -62,6 +67,7 @@ Item {
             id: searchField
             width: parent.width
             placeholderText: qsTr("Search applications")
+            onTextChanged: ApplicationService.filter = text
         }
 
         Item {
@@ -87,7 +93,7 @@ Item {
                 Column {
                     width: parent.width
                     spacing: 8
-                    visible: !root.searching && MockApps.recents.length > 0
+                    visible: !root.searching && !root.usingInstalledApps && MockApps.recents.length > 0
 
                     Text {
                         text: qsTr("Recent")
@@ -133,14 +139,33 @@ Item {
 
                     Grid {
                         id: appGrid
-                        visible: root.filteredApps.length > 0
+                        visible: root.resultCount > 0
                         width: parent.width
                         columns: 4
                         columnSpacing: 6
                         rowSpacing: 6
 
                         Repeater {
-                            model: root.filteredApps
+                            model: root.usingInstalledApps ? ApplicationService.filteredModel : []
+                            delegate: AppItem {
+                                required property string desktopId
+                                required property string name
+                                required property string comment
+                                required property string iconName
+                                width: (appGrid.width - 18) / 4
+                                variant: "tile"
+                                item: ({
+                                    desktopId: desktopId,
+                                    name: name,
+                                    comment: comment,
+                                    iconName: iconName
+                                })
+                                onSelected: root.launchApp(item)
+                            }
+                        }
+
+                        Repeater {
+                            model: root.usingInstalledApps ? [] : root.mockMatches
                             delegate: AppItem {
                                 required property var modelData
                                 width: (appGrid.width - 18) / 4
@@ -152,7 +177,7 @@ Item {
                     }
 
                     Text {
-                        visible: root.filteredApps.length === 0
+                        visible: root.resultCount === 0
                         width: parent.width
                         topPadding: 8
                         text: qsTr("No matching applications")
@@ -165,7 +190,7 @@ Item {
                 Column {
                     width: parent.width
                     spacing: 8
-                    visible: !root.searching && MockApps.projects.length > 0
+                    visible: !root.searching && !root.usingInstalledApps && MockApps.projects.length > 0
 
                     Text {
                         text: qsTr("Recent projects")
@@ -286,10 +311,12 @@ Item {
     }
 
     function launchApp(app) {
-        ShellState.launch(app.name)
+        if (app && app.desktopId)
+            ApplicationService.launch(app.desktopId)
+        ShellState.closeLauncher()
     }
 
     function openProject(project) {
-        ShellState.launch(project.name)
+        ShellState.closeLauncher()
     }
 }