theme: move the alarm colour from pink to mauve

Mocha's pink is a pastel. Filled at slab size against the near-black
Persona surfaces it went chalky rather than sharp, which is what made
hovered destructive buttons read as a washed-out red. Mauve is saturated
enough to bite against that ground and still cannot be confused with the
blue accent.

Applies across quickshell, Hyprland, dunst, fish and nvim. The GTK
overrides are dropped entirely — stock Catppuccin Mocha Blue already
paints those surfaces, and a hand-written destructive colour there was
one more thing to keep in step for no gain.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

hypr/lua/palette.lua

@@ -1,6 +1,6 @@
 -- Mocha palette — kept in step with ~/.config/quickshell/config/Theme.qml.
 --
--- Catppuccin Mocha ground, blue accent, pink alarm. Nothing else carries hue.
+-- Catppuccin Mocha ground, blue accent, mauve alarm. Nothing else carries hue.
 --
 -- Returned as a table, so every module that paints something does
 --   local c = require("lua/palette")
@@ -10,14 +10,14 @@ local c = {}
 
 -- ---------------------------------------------------------------- THE KNOBS
 -- Two colours in this setup: blue for anything live (window borders, group
--- indicators, focus), pink for anything wrong. Change these lines and every
+-- indicators, focus), mauve for anything wrong. Change these lines and every
 -- painted edge recolours with them.
 --
 -- Keep them in step with `accent` / `alarm` in
 -- ~/.config/quickshell/config/Theme.qml, which is what colours the shell.
 -- Those are the only places the colours are written.
 c.accent = "rgb(89b4fa)"
-c.alarm = "rgb(f5c2e7)"
+c.alarm = "rgb(cba6f7)"
 
 c.accentDim = "rgb(5a7dc0)"
 c.accentSoft = "rgb(b4befe)"