feat(system): comprehensive branding, styling, and system feature update

- Relocate themes to assets/themes/ and update all references.
- Implement custom SDDM theme and Plymouth theme enhancements.
- Add themed templates for Alacritty, Hyprland, Waybar, and other apps.
- Introduce Makima key remapper module and configuration.
- Add Voxtype and Walker configurations.
- Implement systemd power management and timeout optimizations.
- Add Nautilus-python extensions for LocalSend.
- Update branding assets and ASCII art integration.

assets/nautilus-python/extensions/localsend.py

@@ -0,0 +1,84 @@
+import os
+import shutil
+
+from gi import require_version
+
+require_version("Nautilus", "4.1")
+
+from gi.repository import GObject, Gio, Nautilus
+
+
+class SendViaLocalSendAction(GObject.GObject, Nautilus.MenuProvider):
+    def _launch_localsend(self, paths):
+        command = self._resolve_command()
+        if not command:
+            return
+
+        if command[-1] == "@@":
+            command = command + paths + ["@@"]
+        else:
+            command = command + paths
+
+        Gio.Subprocess.new(command, Gio.SubprocessFlags.NONE)
+
+    def _resolve_command(self):
+        localsend = shutil.which("localsend")
+        if localsend:
+            return [localsend, "--headless", "send"]
+
+        flatpak = shutil.which("flatpak")
+        if flatpak and self._has_flatpak_app(flatpak, "org.localsend.localsend_app"):
+            return [
+                flatpak,
+                "run",
+                "--file-forwarding",
+                "org.localsend.localsend_app",
+                "@@",
+            ]
+
+        return None
+
+    def _has_flatpak_app(self, flatpak, app_id):
+        process = Gio.Subprocess.new(
+            [flatpak, "info", app_id],
+            Gio.SubprocessFlags.STDOUT_SILENCE | Gio.SubprocessFlags.STDERR_SILENCE,
+        )
+        return process.wait_check()
+
+    def _selected_paths(self, files):
+        paths = []
+
+        for file in files:
+            location = file.get_location()
+            if not location:
+                continue
+
+            path = location.get_path()
+            if path and path not in paths:
+                paths.append(path)
+
+        return paths
+
+    def _make_item(self, paths):
+        label = (
+            "Send via LocalSend" if len(paths) == 1 else "Send selected via LocalSend"
+        )
+        item = Nautilus.MenuItem(
+            name="LocalSendNautilus::send_via_localsend",
+            label=label,
+            icon="localsend",
+        )
+        item.connect("activate", self._on_activate, paths)
+        return item
+
+    def _on_activate(self, _menu, paths):
+        self._launch_localsend(paths)
+
+    def get_file_items(self, *args):
+        files = args[0] if len(args) == 1 else args[1]
+        paths = self._selected_paths(files)
+
+        if not paths or not self._resolve_command():
+            return []
+
+        return [self._make_item(paths)]