feat(config): enable selective blur for terminals and set flat decoration defaults

dot_config/hypr/looknfeel.lua

@@ -5,26 +5,44 @@
 -- last writer and wins over the theme. That is the point of this file: a theme
 -- picks colours, the compositor's feel stays ours.
 
--- Omarchy 4's decoration defaults, pinned explicitly.
+-- Flat by default, glass for terminals only.
 --
--- Stock quattro is flat and cheap: rounding 0, blur off, shadow off
--- ($OMARCHY_PATH/default/hypr/looknfeel.lua). Most third-party themes ship a
--- hyprland.lua that turns glass on instead -- Cyberdream and Spectra both did --
--- and on this box that is a bad trade: blur at size 6 / 3 passes over an eDP
--- panel plus a 5K Studio Display is real frame time on an iGPU sharing system
--- memory, and rounded corners plus per-window opacity make the Chromium and
--- Electron surfaces (which cannot paint a transparent background themselves)
--- show wallpaper where page background should be.
+-- Stock quattro is rounding 0, blur off, shadow off
+-- ($OMARCHY_PATH/default/hypr/looknfeel.lua); themes that ship a hyprland.lua
+-- turn all three on for every window (Cyberdream and Spectra both did), which
+-- on this box is a bad trade: blur over an eDP panel plus a 5K Studio Display
+-- is real frame time on an iGPU sharing system memory, and Chromium/Electron
+-- windows cannot paint a transparent background, so fading them just shows
+-- wallpaper where page background should be.
 --
--- Turning blur off globally also neutralises any layer_rule blur a theme adds
--- for the Quickshell surfaces: a layer rule cannot blur while
--- decoration:blur:enabled is false.
+-- Blur has to be enabled globally to exist at all -- there is no positive
+-- `blur` window rule, only `no_blur`, and kitty's own `background_blur` (the
+-- ext-background-effect-v1 protocol, which Hyprland 0.56 does implement) is a
+-- no-op while decoration:blur:enabled is false. So: switch it on here, then
+-- opt every window out again except the terminals below.
 hl.config({
+  general = {
+    -- Master instead of Omarchy's dwindle. Per-workspace layouts saved by
+    -- omarchy-hyprland-workspace-layout-toggle (~/.local/state/omarchy/
+    -- workspace-layouts/*.lua) still win for the workspaces they name.
+    layout = "master",
+  },
+
   decoration = {
     rounding = 0,
 
     blur = {
-      enabled = false,
+      enabled = true,
+      -- Cheaper than the themes' size 6 / 3 passes; with only terminals
+      -- blurred this is a handful of quads per frame, not the whole screen.
+      size = 5,
+      passes = 2,
+      brightness = 0.8,
+      contrast = 1.1,
+      vibrancy = 0.15,
+      noise = 0.01,
+      new_optimizations = true,
+      popups = false,
     },
 
     shadow = {
@@ -40,12 +58,21 @@ hl.config({
   },
 })
 
--- Omarchy tags every mapped window `default-opacity` and fades it with this
--- rule; themes re-issue it with deeper values (Cyberdream used 0.98 / 0.92).
--- Window rules are last-match-wins, so restating the default here puts every
--- window that did not explicitly opt out of the tag back on stock fade.
--- Terminals keep their own alpha (kitty's `background_opacity`) on top of it.
-o.window({ tag = "default-opacity" }, { opacity = "0.985 0.96" })
+-- Omarchy tags every mapped window `default-opacity` and fades it to
+-- 0.985 / 0.96; themes deepen that (Cyberdream used 0.98 / 0.92). Rules are
+-- last-match-wins, so this pins every window opaque and blur-free. An opaque
+-- window has nothing visible behind it, so the pass above never runs for it.
+o.window({ tag = "default-opacity" }, { opacity = "1.0 1.0", no_blur = true })
+
+-- The exception: terminals carry their own alpha (kitty's
+-- `background_opacity`, 0.9 in ~/.config/kitty/kitty.conf), so they are the one
+-- surface where blurring the backdrop buys anything. Full class list because
+-- the kitty hosts run under their own app-ids (kitty-herdr, kitty-tmux,
+-- kitty-goliath) and Omarchy tags nothing as `terminal`.
+o.window(
+  "^(kitty(-.*)?|Alacritty|com\\.mitchellh\\.ghostty|foot|org\\.codeberg\\.dnkl\\.foot|wezterm)$",
+  { no_blur = false }
+)
 
 -- Themes are also free to re-enable the workspace slide (Spectra sets
 -- `workspaces` with its "flow" bezier); Omarchy's default is off. Restate it.

dot_config/kitty/kitty.conf

@@ -4,15 +4,14 @@ bold_italic_font auto
 window_padding_width 8
 hide_window_decorations yes
 # 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.
+# whole window (chrome included), kitty only makes the cell background
+# translucent, so text stays fully opaque on top of it. This alpha is also what
+# makes kitty the one window Hyprland blurs: hypr/looknfeel.lua enables blur
+# globally and then opts every window out except the terminal classes, and an
+# opaque window has no backdrop to blur. kitty's own `background_blur` does
+# nothing here -- it rides ext-background-effect-v1, which Hyprland ignores
+# while decoration:blur:enabled is false, and is redundant once it is true.
 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