feat: rewrite moonset in Rust (gtk4-rs + gtk4-layer-shell)

Feature-parity with Python v0.2.0. Same CSS, same UI, same actions.
Single 3.1 MB binary with embedded resources (CSS, wallpaper, avatar).

Modules: power.rs, i18n.rs, config.rs, users.rs, panel.rs, main.rs
45 unit tests passing. Python sources retained as reference.

pkg/PKGBUILD

@@ -7,20 +7,16 @@ pkgname=moonset-git
 pkgver=0.1.0.r8.g934a923
 pkgrel=1
 pkgdesc="A Wayland session power menu with GTK4 and Layer Shell"
-arch=('any')
+arch=('x86_64')
 url="https://gitea.moonarch.de/nevaforget/moonset"
 license=('MIT')
 depends=(
-    'python'
-    'python-gobject'
     'gtk4'
     'gtk4-layer-shell'
 )
 makedepends=(
     'git'
-    'python-build'
-    'python-installer'
-    'python-hatchling'
+    'cargo'
 )
 provides=('moonset')
 conflicts=('moonset')
@@ -34,13 +30,12 @@ pkgver() {
 
 build() {
     cd "$srcdir/moonset"
-    rm -rf dist/
-    python -m build --wheel --no-isolation
+    cargo build --release --locked
 }
 
 package() {
     cd "$srcdir/moonset"
-    python -m installer --destdir="$pkgdir" dist/*.whl
+    install -Dm755 target/release/moonset "$pkgdir/usr/bin/moonset"
 
     # Example config
     install -Dm644 config/moonset.toml "$pkgdir/etc/moonset/moonset.toml.example"