feat(config): enforce flat decoration, disable blur and adjust Kitty transparency defaults

dot_config/kitty/kitty.conf

@@ -3,9 +3,16 @@ font_family VictorMono Nerd Font
 bold_italic_font auto
 window_padding_width 8
 hide_window_decorations yes
-# Fallback for themes that ship no opacity; the Omarchy theme include at the
-# bottom of this file overrides it (Spectra sets 0.55).
+# Transparency: kitty's own alpha, not the compositor's -- Hyprland fades a
+# window uniformly (chrome included), kitty only makes the cell background
+# translucent, so text stays fully opaque on top of it.
 background_opacity 0.9
+# Per-window blur without global blur. Hyprland 0.56 implements the staging
+# protocol ext-background-effect-v1 and kitty's Wayland backend speaks it, so
+# kitty asks the compositor to blur the region behind its own surface. That is
+# why hypr/looknfeel.lua can keep decoration:blur:enabled = false: nothing else
+# on screen pays for the blur pass. Needs background_opacity < 1.
+background_blur 1
 cursor_blink_interval 1
 copy_on_select auto
 strip_trailing_spaces smart