gui: add application icon and desktop file

CMakeLists.txt

@@ -104,6 +104,17 @@ if (WITH_GUI)
         src/gui/user_config.cpp
         src/gui/user_interface.cpp
     )
+    install(FILES src/resources/gui/de.syping.dtranslatebot.desktop DESTINATION "${CMAKE_INSTALL_DATAROOTDIR}/applications")
+    install(FILES src/resources/gui/dtranslatebot-16.png DESTINATION "${CMAKE_INSTALL_DATAROOTDIR}/icons/hicolor/16x16/apps" RENAME de.syping.dtranslatebot.png)
+    install(FILES src/resources/gui/dtranslatebot-20.png DESTINATION "${CMAKE_INSTALL_DATAROOTDIR}/icons/hicolor/20x20/apps" RENAME de.syping.dtranslatebot.png)
+    install(FILES src/resources/gui/dtranslatebot-24.png DESTINATION "${CMAKE_INSTALL_DATAROOTDIR}/icons/hicolor/24x24/apps" RENAME de.syping.dtranslatebot.png)
+    install(FILES src/resources/gui/dtranslatebot-32.png DESTINATION "${CMAKE_INSTALL_DATAROOTDIR}/icons/hicolor/32x32/apps" RENAME de.syping.dtranslatebot.png)
+    install(FILES src/resources/gui/dtranslatebot-48.png DESTINATION "${CMAKE_INSTALL_DATAROOTDIR}/icons/hicolor/48x48/apps" RENAME de.syping.dtranslatebot.png)
+    install(FILES src/resources/gui/dtranslatebot-64.png DESTINATION "${CMAKE_INSTALL_DATAROOTDIR}/icons/hicolor/64x64/apps" RENAME de.syping.dtranslatebot.png)
+    install(FILES src/resources/gui/dtranslatebot-96.png DESTINATION "${CMAKE_INSTALL_DATAROOTDIR}/icons/hicolor/96x96/apps" RENAME de.syping.dtranslatebot.png)
+    install(FILES src/resources/gui/dtranslatebot-128.png DESTINATION "${CMAKE_INSTALL_DATAROOTDIR}/icons/hicolor/128x128/apps" RENAME de.syping.dtranslatebot.png)
+    install(FILES src/resources/gui/dtranslatebot-256.png DESTINATION "${CMAKE_INSTALL_DATAROOTDIR}/icons/hicolor/256x256/apps" RENAME de.syping.dtranslatebot.png)
+    install(FILES src/resources/gui/dtranslatebot-512.png DESTINATION "${CMAKE_INSTALL_DATAROOTDIR}/icons/hicolor/512x512/apps" RENAME de.syping.dtranslatebot.png)
 else()
     list(APPEND DTRANSLATEBOT_SOURCES
         src/cli/main.cpp
@@ -123,7 +134,7 @@ if (WIN32)
 endif()
 
 # dtranslatebot systemd Service
-if (UNIX AND NOT APPLE)
+if (LINUX AND NOT WITH_GUI)
     option(WITH_SYSTEMD "Build with systemd Support" OFF)
     if (WITH_SYSTEMD)
         find_program(SYSTEMD_ESCAPE_EXECUTABLE NAMES systemd-escape)

src/resources/gui/de.syping.dtranslatebot.desktop

@@ -0,0 +1,8 @@
+[Desktop Entry]
+Type=Application
+Name=dtranslatebot
+Comment=Discord Translation Bot
+Categories=GTK;Network;
+TryExec=dtranslatebot
+Exec=dtranslatebot
+Icon=de.syping.dtranslatebot

src/resources/gui/dtranslatebot.svg

@@ -0,0 +1,71 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg
+   width="512"
+   height="512"
+   viewBox="0 0 512 512"
+   version="1.1"
+   id="svg1"
+   sodipodi:docname="dtranslatebot.svg"
+   inkscape:version="1.4.3 (0d15f75042, 2025-12-25)"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns:xlink="http://www.w3.org/1999/xlink"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:svg="http://www.w3.org/2000/svg">
+  <sodipodi:namedview
+     id="namedview1"
+     pagecolor="#ffffff"
+     bordercolor="#000000"
+     borderopacity="0.25"
+     inkscape:showpageshadow="2"
+     inkscape:pageopacity="0.0"
+     inkscape:pagecheckerboard="0"
+     inkscape:deskcolor="#d1d1d1"
+     inkscape:zoom="0.7861328"
+     inkscape:cx="78.231057"
+     inkscape:cy="-41.341616"
+     inkscape:window-width="1920"
+     inkscape:window-height="1014"
+     inkscape:window-x="0"
+     inkscape:window-y="0"
+     inkscape:window-maximized="1"
+     inkscape:current-layer="svg1" />
+  <defs
+     id="defs1">
+    <linearGradient
+       id="linearGradient20">
+      <stop
+         style="stop-color:#000080;stop-opacity:1;"
+         offset="0.94611311"
+         id="stop20" />
+      <stop
+         style="stop-color:#000000;stop-opacity:1;"
+         offset="0.94611311"
+         id="stop22" />
+    </linearGradient>
+    <radialGradient
+       xlink:href="#linearGradient20"
+       id="radialGradient22"
+       cx="256"
+       cy="256"
+       fx="256"
+       fy="256"
+       r="224"
+       gradientUnits="userSpaceOnUse" />
+  </defs>
+  <g
+     id="logo"
+     transform="matrix(1.1229117,0,0,1.1228898,-31.468219,-31.452673)">
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+       id="circle"
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