Add Hyprland and Niri configuration files

- Introduced `binds.nix` for Hyprland, defining keybindings for various applications and workspace management.
- Added `base-settings.nix` and `window-rules.nix` for Niri, establishing keyboard input settings and window management rules.
- Updated `default.nix` for both Hyprland and Niri to import new configuration files, enhancing modularity and maintainability.

modules/desktop/niri/window-rules.nix

@@ -0,0 +1,37 @@
+{ ... }: {
+  flake.lib.niriWindowRules = [
+    {
+      matches = [
+        {
+          app-id = "^$";
+          title = "^$";
+        }
+      ];
+      open-floating = true;
+      open-focused = false;
+    }
+    {
+      matches = [
+        { title = "^(Picture-in-Picture|Picture in picture)$"; }
+      ];
+      open-floating = true;
+      open-focused = false;
+      default-column-width = { fixed = 640; };
+      default-window-height = { fixed = 360; };
+      default-floating-position = _: {
+        props = {
+          x = 32;
+          y = 32;
+          relative-to = "bottom-right";
+        };
+      };
+    }
+    {
+      matches = [
+        { app-id = "^Minecraft\\*"; }
+        { app-id = "^Minecraft$"; }
+      ];
+      tiled-state = true;
+    }
+  ];
+}