Add polished system feedback overlays

config/dot/quickshell/shell.qml

@@ -38,6 +38,7 @@ import qs.modules.datemenu
 import qs.modules.focus
 import qs.modules.signals
 import qs.modules.settings
+import qs.modules.osd
 
 // Clipboard and datemenu ship explicit qmldir manifests because they were
 // added while this daily-driver shell was already running; that also keeps
@@ -72,6 +73,11 @@ ShellRoot {
         SignalGlass {}
     }
 
+    Variants {
+        model: Quickshell.screens
+        Osd {}
+    }
+
     // ── Single-instance overlays ────────────────────────────────────────────
     // These are always constructed but only *visible* when ShellState says so.
     // They're cheap while hidden, and keeping them alive means opening the
@@ -194,6 +200,25 @@ ShellRoot {
         }
     }
 
+    IpcHandler {
+        target: "osd"
+
+        function progress(kind: string, value: int, maximum: int, label: string): void {
+            OsdState.progress(kind, value, maximum, label);
+        }
+        function message(kind: string, label: string): void {
+            OsdState.message(kind, label);
+        }
+        function hide(): void { OsdState.hide(); }
+        function status(): string {
+            return JSON.stringify({
+                active: OsdState.active,
+                monitorName: OsdState.monitorName,
+                state: OsdState.state
+            });
+        }
+    }
+
     IpcHandler {
         target: "activity"