feat: major Calamares overhaul — dracut migration, branding polish, online/offline installer split

=== Calamares (core) ===
- Unskip packagechooserq from _skip_modules so it compiles in
- pkgrel 2→3

=== Calamares Branding ===
branding.desc:
- Blue Antergos color scheme (#4A9EFF accent, #20252B sidebar)
- New Antergos logo/icon PNGs from cnchi assets
- Larger window (860x540)
- Fix sidebar/navigation to widget mode

stylesheet.qss:
- Blue-themed QSS with gradients, styled buttons/inputs/sidebar

show.qml:
- 6-slide Calamares slideshow: welcome, EndeavourOS base, DE list,
  Antergos tools, finishing, thank-you (dark slide)

dracut migration:
- dracut.conf (NEW): initramfsName for dracut module compatibility
- Remove mkinitcpio reference, dracut handles initramfs generation

=== Online/Offline Installer Split ===
Problem: unpackfs (GNOME squashfs) + netinstall (selected DE) installs
two DEs — wasteful and messy.
Solution: Two entirely separate Calamares configurations.

settings_offline.conf (NEW):
- Traditional unpackfs path, no netinstall steps
- Installs GNOME from pre-built squashfs (current behavior)
- Used by default `calamares` or via `calamares -c /etc/calamares-offline`

settings_online.conf (NEW):
- No unpackfs — everything installed from internet via netinstall
- netinstall in both show (DE selection) and exec (package install)
- Base system + Antergos packages as hidden/immutable groups
- Used via `calamares -c /etc/calamares-online`

netinstall.yaml (NEW):
- Base System (hidden, immutable): kernel, base, firmware, network
- Antergos Packages (hidden, immutable): wallpapers, welcome, yay, calamares
- 8 Desktop Environments: KDE, GNOME, Xfce, Budgie, Cinnamon, MATE, LXQt, i3/Sway
- Hardware Support group: GPU drivers, vulkan, pipewire

netinstall.conf (NEW): groupsUrl pointing to netinstall.yaml

welcome.conf (NEW): internet check (informational), 8GB storage/2GB RAM/power required

calamares-next.sh (NEW): Launcher script — zenity/kdialog/dialog
choice between Offline and Online, runs Calamares with the right config.
Checks internet connectivity before starting online install.

PKGBUILD install layout:
- Branding shared at /usr/share/calamares/branding/antergos-next/
- Modules shared at /etc/calamares/modules/
- /etc/calamares-offline/  — settings.conf for offline
- /etc/calamares-online/   — settings.conf for online
- /etc/calamares/settings.conf → symlink to offline (default)
- /usr/bin/calamares-next  — launcher script

=== Antergos Welcome ===
PKGBUILD: copy data/preferences.json to package root (fixes
runtime preferences loading in subdirectory layout)

packages/calamares/PKGBUILD

@@ -5,7 +5,7 @@
 _pkgname="calamares"
 pkgname="$_pkgname"
 pkgver=3.4.2
-pkgrel=1
+pkgrel=3
 pkgdesc="Distribution-independent installer framework"
 url="https://codeberg.org/Calamares/calamares"
 license=("GPL-3.0-or-later")
@@ -33,8 +33,6 @@ sha256sums=('733bbbb00dc9f84874bd5c22960952f317ea2537565431179fa2152b2fbfdccc')
 
 build() {
   local _skip_modules=(
-    dracut
-    dracutlukscfg
     dummycpp
     dummyprocess
     dummypython
@@ -43,7 +41,6 @@ build() {
     initramfscfg
     interactiveterminal
     packagechooser
-    packagechooserq
     services-openrc
   )