Add Papirus mimetype icons to WallpaperAdwaita theme

Copies Papirus-Dark mimetype icons into WallpaperAdwaita for
distinctive file type icons (json, python, markdown, etc.)
while keeping the wallpaper-colored folder icons from Adwaita.

Also fixes recolor script to process all place icons, not just
folders (fixes Desktop icon), and improves color mapping.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

home-manager/fred.nix

@@ -47,6 +47,11 @@
     [templates.gtk4]
     input_path = "${inputs.self}/templates/gtk4-colors.css"
     output_path = "${config.home.homeDirectory}/.config/gtk-4.0/colors.css"
+
+    [templates.recolor-folders]
+    input_path = "${inputs.self}/templates/recolor-folders.sh"
+    output_path = "${config.home.homeDirectory}/.local/share/matugen/recolor-folders.sh"
+    post_hook = "bash ${config.home.homeDirectory}/.local/share/matugen/recolor-folders.sh"
   '';
 
 }

settings/gnome.nix

@@ -22,6 +22,7 @@
       adwaita-icon-theme
       gnome-themes-extra
       adwaita-icon-theme-legacy
+      papirus-icon-theme
       adw-gtk3
       matugen
     ];
@@ -41,7 +42,7 @@
     programs.dconf.profiles.user.databases = [{
       settings = {
         "org/gnome/desktop/interface" = {
-          icon-theme = "Adwaita";
+          icon-theme = "WallpaperAdwaita";
           cursor-theme = "Adwaita";
         };
         "org/gnome/mutter" = {

templates/recolor-folders.sh

@@ -0,0 +1,52 @@
+#!/bin/bash
+# Generated by matugen — recolors Adwaita folder icons with wallpaper palette
+# and pulls in Papirus mimetype icons for better file type distinction
+ICON_DIR="$HOME/.local/share/icons/WallpaperAdwaita"
+ADWAITA="/run/current-system/sw/share/icons/Adwaita"
+PAPIRUS="/run/current-system/sw/share/icons/Papirus-Dark"
+
+mkdir -p "$ICON_DIR/scalable/places"
+
+# Create index.theme
+cat > "$ICON_DIR/index.theme" << 'THEME'
+[Icon Theme]
+Name=WallpaperAdwaita
+Comment=Adwaita with wallpaper-colored folders and Papirus mimetypes
+Inherits=Adwaita,hicolor
+DisplayDepth=32
+
+[scalable/places]
+Size=128
+MinSize=16
+MaxSize=512
+Type=Scalable
+Context=Places
+
+[64x64/mimetypes]
+Size=64
+MinSize=16
+MaxSize=512
+Type=Scalable
+Context=MimeTypes
+THEME
+
+# Recolor all Adwaita place SVGs with wallpaper palette
+for svg in "$ADWAITA/scalable/places"/*.svg; do
+  name=$(basename "$svg")
+  sed \
+    -e 's/#438de6/{{colors.primary_container.default.hex}}/gi' \
+    -e 's/#62a0ea/{{colors.primary_fixed_dim.default.hex}}/gi' \
+    -e 's/#a4caee/{{colors.primary_fixed.default.hex}}/gi' \
+    -e 's/#afd4ff/{{colors.primary_fixed.default.hex}}/gi' \
+    -e 's/#c0d5ea/{{colors.primary_fixed.default.hex}}/gi' \
+    "$svg" > "$ICON_DIR/scalable/places/$name"
+done
+
+# Copy Papirus mimetype icons for better file type distinction
+if [ -d "$PAPIRUS/64x64/mimetypes" ]; then
+  mkdir -p "$ICON_DIR/64x64/mimetypes"
+  cp -a "$PAPIRUS/64x64/mimetypes"/* "$ICON_DIR/64x64/mimetypes/"
+fi
+
+# Update icon cache
+gtk-update-icon-cache -f "$ICON_DIR" 2>/dev/null || true