small code cleanup and added components/ folder for reusable code

launcher/Launcher.qml

@@ -31,6 +31,7 @@ PanelWindow {
     property bool   _keyboardNav: false
     property var    allItems:     []
     property bool   loading:      false
+    property int    lastCacheUpdate: 0
 
 
     readonly property int defaultIndex: Cfg.Config.launcherSelectFirst ? 0 : -1
@@ -67,7 +68,14 @@ PanelWindow {
 
     function loadItems() {
         loading = true
+        var now = Date.now()
+        var staleMs = 300000
+        if (now - lastCacheUpdate < staleMs) {
+            readCache()
+            return
+        }
         readCache()
+        lastCacheUpdate = now
         updateProc.command = [Cfg.Config.launcherScript, "--update-only"]
         updateProc.running = true
     }