Fix menu/launcher to use installed apps; add pcmanfm, mousepad, arandr

Menu and launcher fallback pointed to alacritty/firefox/rigel/quill
which are not in the live ISO. Switch to xterm (already installed),
pcmanfm and mousepad (now added to packages). Also add arandr for
display settings.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

launcher/src/launcher.c

@@ -174,15 +174,11 @@ static void load_apps(void) {
     /* fallback if no .desktop files (dev environment, macOS, etc.) */
     if (NAPP == 0) {
         static const struct { const char *n, *c, *cat; } FB[] = {
-            { "Firefox",     "firefox &",          "Internet" },
-            { "Terminal",    "alacritty &",        "System"   },
-            { "Files",       "thunar &",           "System"   },
-            { "Text Editor", "mousepad &",         "System"   },
-            { "Media",       "mpv --player-operation-mode=pseudo-gui &", "Media" },
-            { "Images",      "viewnior &",         "Media"    },
-            { "PDF Viewer",  "evince &",           "Office"   },
-            { "Display",     "arandr &",           "Settings" },
-            { "Audio",       "pavucontrol &",      "Settings" },
+            { "Terminal",    "xterm &",                        "System"   },
+            { "Files",       "pcmanfm &",                      "System"   },
+            { "Text Editor", "mousepad &",                     "System"   },
+            { "System Mon",  "xterm -e htop &",                "System"   },
+            { "Display",     "arandr &",                       "Settings" },
         };
         for (int i = 0; i < (int)(sizeof(FB)/sizeof(FB[0])); i++) {
             snprintf(APPS[i].name, 64, "%s", FB[i].n);