fix: elevate CSS priority to override GTK4 user theme (v0.6.4)

Colloid-Catppuccin theme loaded via ~/.config/gtk-4.0/gtk.css at
PRIORITY_USER (800) was overriding moonlock's PRIORITY_APPLICATION (600),
causing avatar to lose its circular border-radius.

- Use STYLE_PROVIDER_PRIORITY_USER for app CSS provider
- Replace border-radius: 50% with 9999px (GTK4 CSS percentage quirk)

Cargo.lock

@@ -575,7 +575,7 @@ dependencies = [
 
 [[package]]
 name = "moonlock"
-version = "0.6.3"
+version = "0.6.4"
 dependencies = [
  "gdk-pixbuf",
  "gdk4",

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "moonlock"
-version = "0.6.3"
+version = "0.6.4"
 edition = "2024"
 description = "A secure Wayland lockscreen with GTK4, PAM and fingerprint support"
 license = "MIT"

resources/style.css

@@ -23,7 +23,7 @@ window.lockscreen.visible {
 
 /* Round avatar image */
 .avatar {
-    border-radius: 50%;
+    border-radius: 9999px;
     min-width: 128px;
     min-height: 128px;
     background-color: @theme_selected_bg_color;

src/main.rs

@@ -24,7 +24,7 @@ fn load_css(display: &gdk::Display) {
     gtk::style_context_add_provider_for_display(
         display,
         &css_provider,
-        gtk::STYLE_PROVIDER_PRIORITY_APPLICATION,
+        gtk::STYLE_PROVIDER_PRIORITY_USER,
     );
 }