feat: initial commit — void-installer multi-profile (stable-cinnamon + mainline-niri)

config/profiles/mainline-niri/profile.conf

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+# Mainline-niri profile.
+# Linux mainline kernel + niri Wayland tiling compositor.
+PROFILE_NAME="mainline-niri"
+PROFILE_DESC="Linux mainline kernel + niri Wayland (scrolling tiler)"
+
+# Mainline kernel for best Wayland / GPU support.
+KERNEL_PKG="linux-mainline"
+
+# Display server / DE.
+DISPLAY_SERVER="wayland"
+DESKTOP="niri"
+
+# niri has no dconf, no Cinnamon — most cinnamon helpers are skipped via
+# this DESKTOP gate inside customizations.sh.
+
+# Package list.
+PROFILE_PACKAGES_FILE="config/profiles/mainline-niri/packages.list"
+
+# Theme settings still apply (gtk3/gtk4 apps under wayland still read these).
+GTK_THEME="Gruvbox-Dark"
+ICON_THEME="Gruvbox-Plus-Dark"
+DEFAULT_TERMINAL="alacritty"
+CURSOR_THEME="Bibata-Modern-Ice"
+
+# Wayland shell — noctalia (installed via third-party XBPS repo by niri.sh).
+WAYLAND_SHELL="noctalia"
+
+# Wayland env defaults (exported into /etc/environment by profile customisation).
+QT_QPA_PLATFORM="wayland;xcb"
+GDK_BACKEND="wayland,x11"
+MOZ_ENABLE_WAYLAND="1"