feat(umbriel): enhance workspace layouts and focus behavior

dot_config/umbriel/config.toml

@@ -22,9 +22,16 @@ files = ["noctalia.toml"]
 # polkit agent; nothing else is started.
 autostart = ["noctalia"]
 show_cheatsheet = false
+# niri's honor-xdg-activation-with-invalid-serial: Noctalia notification
+# actions and apps that hand off to another window (links, file pickers) can
+# focus and reveal their target.
+focus_on_activate = true
 
 # Umbriel owns XDG_CURRENT_DESKTOP and the session variables.
 [environment]
+# Default terminal: Noctalia runs Terminal=true launcher entries through
+# $TERMINAL before its own fallback list.
+TERMINAL = "ghostty"
 ELECTRON_OZONE_PLATFORM_HINT = "auto"
 QT_QPA_PLATFORM = "wayland"
 QT_QPA_PLATFORMTHEME = "kde"
@@ -48,23 +55,32 @@ map_to_output = "eDP-1"
 [input.touch]
 map_to_output = "eDP-1"
 
+# follows_focus: keyboard focus moves (Mod+H/L across outputs, umbriel-launch)
+# take the pointer along, so scratchpads — shown on the pointer's output —
+# open where focus is.
 [input.cursor]
 theme = "capitaine-cursors-light"
 size = 24
 hide_when_typing = true
+follows_focus = true
 
 [layout]
 gap = 8
 extent_presets = [0.333, 0.5, 0.667]
 
+# New columns take a third of the output; Mod+R cycles 1/3 → 1/2 → 2/3.
 [layout.scrolling]
-default_extent_fraction = 0.5
+default_extent_fraction = 0.333
 center_focused = "never"
 center_underfull_strip = true
 
 [appearance]
 corner_radius = 10
 
+# niri ran without shadows; also one less pass per window.
+[appearance.shadow]
+enabled = false
+
 # Optimized blur samples only the wallpaper: cheaper than blurring the windows
 # behind each translucent surface.
 [appearance.blur]