feat: add wallpaper feature with 5 new wallpapers

- Add wallpapers.nix module for wallpaper management
- Update hyprland and rofi configs
- Update m3-ares and m3-kratos user configs
- Update flake inputs

home/features/desktop/rofi.nix

@@ -190,6 +190,10 @@ in {
           path = "~/p/CHAT";
           args = "--agent chiron";
         };
+        MISC = {
+          path = "~/p/MISC";
+          args = "--agent chiron-forge";
+        };
       };
       terminal = pkgs.kitty;
       terminalCommand = "opencode %a";