Rebrand as Playpen.

dist/dev.greyson.playpen.desktop.in

@@ -1,16 +1,16 @@
 [Desktop Entry]
 Type=Application
-Name=vtabs
+Name=Playpen
 GenericName=Terminal
-Comment=Terminal emulator with vertical tabs
+Comment=Terminal with vertical tabs, web panes and saved layouts
 # Substituted with an absolute path by `mise run install`, because desktop
 # launchers do not reliably have ~/.local/bin on PATH.
 Exec=@EXEC@
-Icon=dev.greyson.vtabs
+Icon=dev.greyson.playpen
 Terminal=false
 Categories=System;TerminalEmulator;
 Keywords=shell;prompt;command;commandline;cmd;terminal;tabs;
 StartupNotify=true
 # Lets the compositor match the running window to this entry, which is what
 # gives the window its icon. Must equal the GApplication id.
-StartupWMClass=dev.greyson.vtabs
+StartupWMClass=dev.greyson.playpen

dist/dev.greyson.playpen.svg

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-  vtabs app icon: a terminal pane with the vertical tab strip down its left
+  Playpen app icon: a terminal pane with the vertical tab strip down its left
   edge. Shapes are kept large and high-contrast so the sidebar is still
   readable when the icon is scaled down to 32px in a launcher.
 -->