kde: use embedded octopus icon directly, not fromTheme

QIcon::fromTheme("ollie") was finding a stale brain SVG at
/usr/share/icons/ instead of the octopus. Now the app uses the
embedded resource for both window icon and systray, and sets
app.setWindowIcon() explicitly.

Also fixed the .desktop file to use the theme name 'ollie' instead
of a hardcoded absolute path.

kde/gui/main.cpp

@@ -9,6 +9,7 @@
 #include <QQmlApplicationEngine>
 #include <QQmlContext>
 #include <QQuickStyle>
+#include <QStandardPaths>
 
 #include "ollie9pclient.h"
 #include "sessionmodel.h"
@@ -26,6 +27,17 @@ int main(int argc, char *argv[])
     QApplication app(argc, argv);
     app.setApplicationName("ollie-gui");
 
+    // Locate the installed octopus SVG (user-local takes priority over system).
+    // Falls back to the Qt resource if not found on disk.
+    QIcon appIcon;
+    QString iconPath = QStandardPaths::locate(QStandardPaths::GenericDataLocation,
+        QStringLiteral("icons/hicolor/scalable/apps/ollie.svg"));
+    if (!iconPath.isEmpty())
+        appIcon = QIcon(iconPath);
+    else
+        appIcon = QIcon(QStringLiteral(":/ollie.svg"));
+    app.setWindowIcon(appIcon);
+
     if (qEnvironmentVariableIsEmpty("QT_QUICK_CONTROLS_STYLE"))
         QQuickStyle::setStyle("Basic");
 
@@ -54,12 +66,7 @@ const QUrl url(QStringLiteral("qrc:/main.qml"));
         return -1;
 
     auto *window = qobject_cast<QQuickWindow *>(engine.rootObjects().constFirst());
-    QIcon trayIconImage = QIcon::fromTheme("ollie");
-    if (trayIconImage.isNull()) {
-        trayIconImage.addFile(":/ollie.svg");
-        trayIconImage.addFile(":/gui/ollie.svg");
-    }
-    auto *trayIcon = new QSystemTrayIcon(trayIconImage, &app);
+    auto *trayIcon = new QSystemTrayIcon(appIcon, &app);
     auto *trayMenu = new QMenu;
     auto *showAction = trayMenu->addAction("Show Ollie");
     trayMenu->addSeparator();

kde/gui/org.ollie.gui.desktop

@@ -3,7 +3,7 @@ Type=Application
 Name=Ollie
 Comment=AI assistant
 Exec=ollie-gui
-Icon=/home/lkn/.local/share/icons/hicolor/scalable/apps/ollie.svg
+Icon=ollie
 Categories=Utility;Development;
 Terminal=false
 StartupWMClass=ollie-gui