compositor+matugen: border override, hypr/mango layout overrides, new

templates, respect XDG paths
- Add Hyprland and MangoWC templates
- Add GUI gaps, window radius, and border thickness overrides for niri,
  Hyprland, and MangoWC
- Add replacement support in matugen templates for DATA_DIR, CACHE_DIR,
  CONFIG_DIR
fixes #1274
fixes #1273

quickshell/matugen/templates/hypr-colors.conf

@@ -0,0 +1,25 @@
+# ! Auto-generated file. Do not edit directly.
+# Remove source = ./dms/colors.conf from your config to override.
+
+$primary  = rgb({{colors.primary.default.hex_stripped}})
+$outline  = rgb({{colors.outline.default.hex_stripped}})
+$error    = rgb({{colors.error.default.hex_stripped}})
+
+general {
+  col.active_border   = $primary
+  col.inactive_border = $outline
+}
+
+group {
+  col.border_active   = $primary
+  col.border_inactive = $outline
+  col.border_locked_active   = $error
+  col.border_locked_inactive = $outline
+
+  groupbar {
+    col.active         = $primary
+    col.inactive       = $outline
+    col.locked_active   = $error
+    col.locked_inactive = $outline
+  }
+}