Niri migration#2
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Replace the COSMIC desktop with the Niri scrollable-tiling Wayland compositor sourced from sodiboo/niri-flake (unstable channel for xwayland-satellite support). Stack: - Compositor: niri-unstable + xwayland-satellite-unstable (auto-spawned) - Greeter: tuigreet on greetd, U2F PAM kept for YubiKey login - Bar: waybar (systemd-managed, ordered after graphical-session) - Launcher: fuzzel - Notifications: mako - Screen lock: swaylock-effects + swayidle (5min lock, 10min display off) - Power menu: wlogout (lock/logout/reboot/shutdown, no suspend/hibernate) - File manager: nemo-with-extensions + nemo-fileroller + file-roller + ffmpegthumbnailer + webp-pixbuf-loader for image/video previews - GUI text editor: gnome-text-editor (honors prefer-dark) Niri config (typed via niri-flake's programs.niri.settings): - Vim-style HJKL + arrow keys for focus/move - Mouse-wheel column nav (Mod+Scroll) with 150ms cooldown - Touchpad dwt (disable-while-typing) for laptop - Mod+D fuzzel, Mod+Return wezterm, Mod+E nemo, Mod+B brave - Mod+V cliphist menu, Mod+S audio sink picker, Mod+Shift+P wlogout - Direct power binds Mod+Ctrl+Shift+S/R/Q (suspend/reboot/poweroff) - Niri-default screenshot binds (Print, Ctrl+Print, Alt+Print) - Window rules: PiP float, common popups float, Steam dialogs float (main library tiles) Cosmic ISO under hosts/canoe/cosmic.nix kept as-is for travel image. Drop stale GTK_THEME=catppuccin-mocha-blue-standard sessionVariable that was overriding Stylix's adw-gtk3 + prefer-dark setting and causing light right-click menus on GTK3 apps. Swap pam.services.cosmic-greeter.u2fAuth for greetd.u2fAuth. Update README to reflect the new desktop stack.
Wired controllers and audio gear in use — the indicator added noise without value. Tray applet (blueman-applet) kept available.
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Moving to niri from COSMIC.