change noctalia theming, refactor brightness script

dotfiles/shared/niri-shared.kdl

@@ -55,6 +55,7 @@ binds {
     Mod+V hotkey-overlay-title="Show clipboard helper" { spawn "noctalia" "msg" "panel-toggle" "clipboard"; }
     Mod+P hotkey-overlay-title="Show power info" { spawn "noctalia" "msg" "panel-toggle" "control-center" "power"; }
     Mod+W hotkey-overlay-title="Show wallpaper panel" { spawn "noctalia" "msg" "panel-toggle" "wallpaper"; }
+    Mod+Shift+W { spawn "noctalia" "msg" "panel-toggle" "noctalia/wallhaven:browser"; }
     Ctrl+Shift+Escape { spawn "noctalia" "msg" "panel-toggle" "control-center" "system"; }
     Mod+R hotkey-overlay-title="Open Remmina panel" { spawn "noctalia" "msg" "panel-toggle" "rylos/remmina:connections"; }
 
@@ -85,6 +86,8 @@ binds {
 
     Mod+Slash { spawn "niri-scratch-workspace-toggle"; }
     Mod+Shift+Slash { move-window-to-workspace "x" focus=false; }
+
+    Pause { spawn "noctalia" "msg" "media" "toggle"; }
 }
 workspace "x" {
     hidden true