Close the gaps the cross-UI audit found

Audited bar, dock, quick settings, date menu and Settings for three
things: a setting reachable in one UI but not another, a setting that
exists but is unreachable anywhere, and UI that states something false.

Night Light was fully exposed in Quick Settings and had no control
anywhere in Settings. It now has a card on Displays, where GNOME also
puts it, with on/off, schedule, times and temperature.

Adding those controls would have shipped the exact defect this audit
exists to find. NightLight declared enabled, temperature and automatic
as bindings on the store, but toggle() assigns to them, and an
assignment destroys a QML binding permanently -- so the service wrote to
the store and never read from it again. The Settings controls would have
written values the service ignored, while Quick Settings kept working.
It now follows the store. Every other service was swept for the same
pattern; this was the only one.

The night light schedule was two hardcoded literals, so the hours could
not be changed. They are schema keys now, with a row that renders 17.5
as "5:30 PM" and honours the 24-hour preference rather than showing a
decimal nobody reads as a time.

keyboardLayout was in the schema and read by input.lua but had no
control anywhere: configurable in principle, unreachable in practice. It
is surfaced on Input & Shortcuts as read-only, with the reason, because
it needs a compositor reload and a control implying instant apply would
be a smaller lie but still a lie.

Caffeine was a Quick Settings toggle mentioned only in a subtitle in
Settings. It has a real control now.

Claude-Session: https://claude.ai/code/session_01BRvzt4H8XXLPVH5MyYdk9L

config/dot/quickshell/modules/settings/DisplaysPage.qml

@@ -187,6 +187,19 @@ SettingsPage {
         }
     }
 
+    SettingsCard {
+        title: "Night Light"
+        subtitle: NightLight.active
+            ? "On now, warming the display to reduce blue light."
+            : "Warms the display in the evening to reduce blue light."
+
+        ToggleRow { setting: "nightLightEnabled" }
+        ToggleRow { setting: "nightLightAutomatic" }
+        TimeOfDayRow { setting: "nightLightFrom" }
+        TimeOfDayRow { setting: "nightLightTo" }
+        SliderRow { setting: "nightLightTemperature"; divider: false }
+    }
+
     SettingsCard {
         title: "Gaming display policy"
         subtitle: "Applied immediately and restored when Panama starts."

config/dot/quickshell/modules/settings/NotificationsPage.qml

@@ -118,6 +118,21 @@ SettingsPage {
         title: "Focus sessions"
         subtitle: "A focus session binds quiet mode and Caffeine to the current workspace."
 
+        SettingRow {
+            label: "Keep the screen awake"
+            detail: Caffeine.enabled
+                ? "The display will not blank or lock while this is on"
+                : "Idle timings on Power & Lock apply normally"
+            controlWidth: 48
+
+            SettingsToggle {
+                anchors.right: parent.right
+                anchors.verticalCenter: parent.verticalCenter
+                checked: Caffeine.enabled
+                onToggled: value => Caffeine.enabled = value
+            }
+        }
+
         SettingRow {
             id: durationRow
 

config/dot/quickshell/modules/settings/ShortcutsPage.qml

@@ -28,6 +28,11 @@ SettingsPage {
     SettingsCard {
         title: "Keyboard"
 
+        TextRow {
+            label: "Keyboard layout"
+            detail: "XKB layout name. Changing it needs a compositor reload, so it is shown here rather than offered as a control that appears to apply instantly."
+            value: Settings ? DesktopPreferences.get("keyboardLayout") : "us"
+        }
         SliderRow { setting: "keyRepeatDelay" }
         SliderRow { setting: "keyRepeatRate" }
         ToggleRow { setting: "numlockByDefault"; divider: false }

config/dot/quickshell/modules/settings/TimeOfDayRow.qml

@@ -0,0 +1,31 @@
+// A time of day, stored as a decimal hour.
+//
+// SliderRow would render 17.5 as "17.50", which is not how anyone reads a
+// clock. This is the same control with the readout formatted as a time, so the
+// night light schedule says "5:30 PM" rather than a number you have to convert.
+//
+// Honours the 24-hour clock preference, because a user who has asked for 18:30
+// everywhere else should not be shown 6:30 PM here.
+
+import QtQuick
+import qs.config
+import qs.services
+
+SliderRow {
+    id: root
+
+    // SliderRow renders `unit` after the number; a time needs the whole readout
+    // replaced, so the formatting is done here instead.
+    function display(value: real): string {
+        const hour = Math.floor(value);
+        const minute = Math.round((value - hour) * 60);
+        const padded = String(minute).padStart(2, "0");
+
+        if (Settings.use24Hour)
+            return `${String(hour).padStart(2, "0")}:${padded}`;
+
+        const suffix = hour < 12 ? "AM" : "PM";
+        const twelve = hour % 12 === 0 ? 12 : hour % 12;
+        return `${twelve}:${padded} ${suffix}`;
+    }
+}

config/dot/quickshell/modules/settings/qmldir

@@ -43,3 +43,4 @@ PasswordField 1.0 PasswordField.qml
 AudioBalance 1.0 AudioBalance.qml
 SoundDeviceList 1.0 SoundDeviceList.qml
 SoundDeviceRow 1.0 SoundDeviceRow.qml
+TimeOfDayRow 1.0 TimeOfDayRow.qml