Bound the notification app list, and give Focus a real editor

Claude-Session: https://claude.ai/code/session_01Ms2FbjQy31TVf3CEvQhGM8

config/dot/quickshell/services/SettingsRoutes.qml

@@ -24,8 +24,9 @@ Singleton {
 
     // A category with no tabs is a leaf itself. A category with tabs is
     // addressed by its first available tab; its own page id is accepted as an
-    // alias. Three category ids ("applications", "users", "privacy") double as
-    // the id of their first tab, which resolves to the same place either way.
+    // alias. Four category ids ("notifications", "applications", "users",
+    // "privacy") double as the id of their first tab, which resolves to the
+    // same place either way.
     readonly property var categories: [
         { page: "home", label: "Home", icon: "\u{F02DC}", tabs: [
             { page: "home", label: "Overview" },
@@ -42,7 +43,10 @@ Singleton {
         ] },
         { page: "displays", label: "Displays", icon: "\u{F0379}", tabs: [] },
         { page: "sound", label: "Sound", icon: "\u{F057E}", tabs: [] },
-        { page: "notifications", label: "Notifications & Focus", icon: "\u{F009A}", tabs: [] },
+        { page: "notifications", label: "Notifications & Focus", icon: "\u{F009A}", tabs: [
+            { page: "notifications", label: "Notifications" },
+            { page: "focus", label: "Focus" }
+        ] },
         { page: "input", label: "Input", icon: "\u{F030C}", tabs: [
             { page: "shortcuts", label: "Keyboard" },
             { page: "mouse", label: "Mouse & Touchpad" },