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/translations/settings_search_index.json

@@ -7023,6 +7023,43 @@
       "timeout"
     ]
   },
+  {
+    "section": "lowerDisplayRefreshRateOnBattery",
+    "label": "Lower display refresh rate on battery",
+    "tabIndex": 21,
+    "category": "Power & Sleep",
+    "keywords": [
+      "60hz",
+      "available",
+      "battery",
+      "charge",
+      "charging",
+      "display",
+      "displays",
+      "enabled",
+      "energy",
+      "hz",
+      "lower",
+      "mode",
+      "monitor",
+      "monitors",
+      "output",
+      "outputs",
+      "power",
+      "previous",
+      "rate",
+      "refresh",
+      "restore",
+      "screen",
+      "screens",
+      "shutdown",
+      "skips",
+      "sleep",
+      "suspend",
+      "switch"
+    ],
+    "description": "Switch displays with an available 60 Hz mode to 60 Hz on battery and restore the previous mode on AC. Skips displays with VRR enabled."
+  },
   {
     "section": "fadeToDpmsGracePeriod",
     "label": "Monitor fade grace period",