fix: add mocha.conf fallback for pywal colors

Add source = mocha.conf before pywal's colors-hyprland.conf so
Catppuccin Mocha colors always load as defaults. Also define
$color1, $color2, $color3, and $background in mocha.conf as
fallbacks for when pywal hasn't generated its color file.

Fixes two Hyprland errors:
- 'source= globbing error: found no match' when pywal file missing
- 'failed to parse $color2 as a color' gradient parsing error

hypr/.config/hypr/hyprland.conf

@@ -8,6 +8,7 @@
 # You can split this configuration into multiple files
 # Create your files separately and then link them to this file like this:
 # source = ~/.config/hypr/myColors.conf
+source = mocha.conf
 source = ~/.cache/wal/colors-hyprland.conf
 
 ################

hypr/.config/hypr/mocha.conf

@@ -76,3 +76,11 @@ $mantleAlpha = 181825
 
 $crust = rgb(11111b)
 $crustAlpha = 11111b
+
+# Fallback colors for when pywal hasn't generated colors-hyprland.conf
+# (sourced by hyprland.conf — $color1/$color2 for active border gradients,
+#  $background for inactive border and general bg usage)
+$color1 = rgb(cba6f7)
+$color2 = rgb(f5c2e7)
+$color3 = rgb(89b4fa)
+$background = rgb(1e1e2e)