flake: add wallpaper management tools

Add setpaper, reload, reload-d, and wpick tools to package list for wallpaper management functionality.

🤖 Generated with [Claude Code](https://claude.ai/code)

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

Author: aster-void

.config/home-manager/flake.nix

@@ -94,6 +94,10 @@
           # inputs.helix.packages.${system}.default
           inputs.zen-browser.packages.${system}.beta
           # build.line # I give up. install it via steam.
+          build.setpaper
+          build.reload
+          build.reload-d
+          build.wpick
         ]
       ];
     in {