Overhaul resize presentation and wallpaper rendering

Coordinate native-pixel resize handoffs, fractional geometry and shared animation timing. Delegate wallpaper rendering to the compositor, advertise DMA-BUF device feedback, and improve callback pacing and render metrics.

Handle monitor-local shell surfaces, lid-driven output evacuation and workspace restoration.

compositor/src/config.rs

@@ -167,6 +167,8 @@ impl Default for InactiveDimConfig {
 
 #[derive(Debug, Default, Deserialize)]
 struct ThemeConfig {
+    #[serde(default)]
+    background: crate::wallpaper::WallpaperConfig,
     #[serde(default)]
     surface: ThemeSurfaceConfig,
     #[serde(default)]
@@ -179,6 +181,12 @@ struct ThemeConfig {
     material: ThemeMaterialConfig,
 }
 
+impl Config {
+    pub(crate) fn wallpaper_settings(&self) -> crate::wallpaper::WallpaperConfig {
+        self.theme.background.clone()
+    }
+}
+
 #[derive(Debug, Default, Deserialize)]
 struct ThemeSurfaceConfig {
     #[serde(default)]