feat: bury offline mode, ship antergos-layan-theme

remember when i thought an offline installer was a good idea?
a pre-built squashfs that still needed internet to install DEs?
"offline" in name only. it was a lie. a beautiful, naive lie.

so i killed it. ripped out the mode picker, the connectivity check,
the whole AskMode() circus. calamares-next now just shows a notice
saying "yeah that wasnt actually offline" and launches directly
into online mode. no more pretending.

also fixed the QML nav button because having a greyed out "Next"
on the last page is terrible UX. now it says "Done" and quits.
youre welcome.

and since we nuked the offline mode, might as well make the
online mode look fucking spectacular. enter antergos-layan-theme:

- kvantum theme because your apps deserve better than qt dreck
- sddm theme (AntergosDark-Layan) for a sexy login screen
- every plasma plasmoid from the rice (panel colorizer, netspeed,
  shutdown switch, applets, separators, music toolbar, the works)
- yakuake arc-dark skin
- antergos logos in /usr/share/logos and /usr/share/pixmaps
- konsole profile, desktop appletsrc, all that jazz
- kde_settings.conf now points to AntergosDark-Layan sddm theme

also replaced the old antergos-grub-theme with the Layan grub
theme because the old one was a git-sourced abomination. 75 distro
icons, terminal box, selection widgets, antergos wallpaper.
ships to /usr/share/grub/themes/antergos/ so calamares finds it.

oh and a dozen audit fixes:
- kscreenlockerrc wallpaper path fixed
- kdialogrc no longer says some other distro
- 7 stale knsregistry files deleted (dev machine was leaking)
- systemd-inhibit guarded with command -v (dinit doesnt have it)
- plasma restart uses killall not systemctl --user
- "XeroLinux Toolkit" -> "Antergos Toolkit" in appletsrc
- KDE_SESSION_VERSION=5 -> =6 (its 2026)
- mirrorlist script says Artix not Arch
- SDDM Messages.sh removed from build artifacts

packages/antergos-layan-theme/Configs/Home/.config/bat/config.conf

@@ -0,0 +1,27 @@
+# This is `bat`s configuration file. Each line either contains a comment or
+# a command-line option that you want to pass to `bat` by default. You can
+# run `bat --help` to get a list of all possible configuration options.
+
+# Specify desired highlighting theme (e.g. "TwoDark"). Run `bat --list-themes`
+# for a list of all available themes
+--theme="Dracula"
+
+# Enable this to use italic text on the terminal. This is not supported on all
+# terminal emulators (like tmux, by default):
+--italic-text=always
+
+--style="numbers,header,grid,snip"
+
+# Uncomment the following line to disable automatic paging:
+--paging=always
+
+# Uncomment the following line if you are using less version >= 551 and want to
+# enable mouse scrolling support in `bat` when running inside tmux. This might
+# disable text selection, unless you press shift.
+#--pager="--RAW-CONTROL-CHARS --quit-if-one-screen --mouse"
+
+# Syntax mappings: map a certain filename pattern to a language.
+#   Example 1: use the C++ syntax for .ino files
+#   Example 2: Use ".gitignore"-style highlighting for ".ignore" files
+--map-syntax "*.ino:C++"
+#--map-syntax ".ignore:Git Ignore"