feat(power): lower refresh rate on battery (#2428)

* feat(power): lower refresh rate on battery (#1203)

Add a Power & Sleep setting that lowers eligible displays to 60 Hz on battery and restores their previous mode on AC power.

Skip displays without an available 60 Hz mode, displays with a single refresh-rate option, current modes at or below 60 Hz, and VRR-enabled outputs.
Apply niri changes at runtime through output commands and use wlr-output-management as fallback.

* fix(quickshell): debounce display refresh sync

* chore: regenerate settings_search_index.json for pre-commit CI fix

* fix: translator context is missing for lowerDisplayRefreshRateOnBattery

* fix: activeDisplayProfileModes is missing from SettingsSpec

* feat: added guard to syncRefreshRates function

* refactor(display): move refresh sync listeners to display service

* fix(display): publish active profile modes after config write

* feat(display): persist previous refresh modes

* fix(display): route refresh mode writes through compositor backends

* fix(display): detect preferred niri refresh modes

* some small cleanups

---------

Co-authored-by: bbedward <bbedward@gmail.com>

quickshell/Common/SettingsData.qml

@@ -758,6 +758,7 @@ Singleton {
     property int batteryLowNotificationType: 0
     property int batteryCriticalNotificationType: 1
     property bool batteryAutoPowerSaver: false
+    property bool lowerDisplayRefreshRateOnBattery: false
     property bool showBatteryPercent: true
     property bool showBatteryPercentOnlyOnBattery: false
     property bool showBatteryTime: false
@@ -971,6 +972,8 @@ Singleton {
     property var hyprlandOutputSettings: ({})
     property var displayProfiles: ({})
     property var activeDisplayProfile: ({})
+    property var activeDisplayProfileModes: ({})
+    property var displayPreviousRefreshModes: ({})
     property bool displayProfileAutoSelect: false
     property bool displayShowDisconnected: false
     property bool displaySnapToEdge: true
@@ -3558,6 +3561,27 @@ Singleton {
         saveSettings();
     }
 
+    function setActiveDisplayProfileModes(compositor, modes) {
+        if (JSON.stringify(activeDisplayProfileModes[compositor] || {}) === JSON.stringify(modes || {}))
+            return;
+        const updated = JSON.parse(JSON.stringify(activeDisplayProfileModes));
+        updated[compositor] = modes;
+        activeDisplayProfileModes = updated;
+        saveSettings();
+    }
+
+    function setDisplayPreviousRefreshModes(compositor, modes) {
+        if (JSON.stringify(displayPreviousRefreshModes[compositor] || {}) === JSON.stringify(modes || {}))
+            return;
+        const updated = JSON.parse(JSON.stringify(displayPreviousRefreshModes));
+        if (Object.keys(modes || {}).length > 0)
+            updated[compositor] = modes;
+        else
+            delete updated[compositor];
+        displayPreviousRefreshModes = updated;
+        saveSettings();
+    }
+
     ListModel {
         id: leftWidgetsModel
     }

quickshell/Common/settings/SettingsSpec.js

@@ -346,6 +346,7 @@ var SPEC = {
     batteryLowNotificationType: { def: 0 },
     batteryCriticalNotificationType: { def: 1 },
     batteryAutoPowerSaver: { def: false },
+    lowerDisplayRefreshRateOnBattery: { def: false },
     lockBeforeSuspend: { def: false },
     loginctlLockIntegration: { def: true },
     fadeToLockEnabled: { def: true },
@@ -530,6 +531,8 @@ var SPEC = {
     hyprlandOutputSettings: { def: {} },
     displayProfiles: { def: {} },
     activeDisplayProfile: { def: {} },
+    activeDisplayProfileModes: { def: {} },
+    displayPreviousRefreshModes: { def: {} },
     displayProfileAutoSelect: { def: false },
     displayShowDisconnected: { def: false },
     displaySnapToEdge: { def: true },