perf: move temperature polling into nova-stats daemon; Temperature.qml is now pure display

modules/SystemStats.qml

@@ -14,6 +14,9 @@ QtObject {
     property var cpuCoreMaxFreq: []
     property var cpuCoreTypes: []
 
+    // ── Temperature ──────────────────────────────────────────────────────
+    property int tempCelsius: 0
+
     // ── Memory ───────────────────────────────────────────────────────────
     property int memPercent: 0
     property real memUsedGb: 0
@@ -52,6 +55,8 @@ QtObject {
                                 history: hist.length > histLen ? hist.slice(hist.length - histLen) : hist
                             };
                         });
+                    } else if (ev.type === "temp") {
+                        root.tempCelsius = ev.celsius;
                     } else if (ev.type === "mem") {
                         root.memPercent = ev.percent;
                         root.memUsedGb = ev.used_gb;

modules/Temperature.qml

@@ -1,39 +1,25 @@
 import QtQuick
-import Quickshell.Io
 import "." as M
 
 M.BarSection {
     id: root
     spacing: Math.max(1, M.Theme.moduleSpacing - 2)
-    tooltip: "Temperature: " + root.celsius + "\u00B0C"
+    tooltip: "Temperature: " + M.SystemStats.tempCelsius + "\u00B0C"
 
-    property int celsius: 0
-    property color _stateColor: celsius > (M.Modules.temperature.hot || 80) ? M.Theme.base09 : celsius > (M.Modules.temperature.warm || 60) ? M.Theme.base0A : root.accentColor
+    property color _stateColor: M.SystemStats.tempCelsius > (M.Modules.temperature.hot || 80) ? M.Theme.base09 : M.SystemStats.tempCelsius > (M.Modules.temperature.warm || 60) ? M.Theme.base0A : root.accentColor
     Behavior on _stateColor {
         ColorAnimation {
             duration: 300
         }
     }
 
-    FileView {
-        id: thermal
-        path: "/sys/class/thermal/thermal_zone0/temp"
-        onLoaded: root.celsius = Math.round(parseInt(text()) / 1000)
-    }
-    Timer {
-        interval: M.Modules.temperature.interval || 2000
-        running: true
-        repeat: true
-        onTriggered: thermal.reload()
-    }
-
     M.BarIcon {
         icon: "\uF2C9"
         color: root._stateColor
         anchors.verticalCenter: parent.verticalCenter
     }
     M.BarLabel {
-        label: root.celsius + "\u00B0C"
+        label: M.SystemStats.tempCelsius + "\u00B0C"
         minText: "100\u00B0C"
         color: root._stateColor
         anchors.verticalCenter: parent.verticalCenter

stats-daemon/src/main.rs

@@ -93,6 +93,23 @@ fn read_stat() -> Vec<Sample> {
     parse_stat(&fs::read_to_string("/proc/stat").unwrap_or_default())
 }
 
+fn read_temp_celsius() -> Option<i32> {
+    let mut max: Option<i32> = None;
+    for i in 0.. {
+        let path = format!("/sys/class/thermal/thermal_zone{i}/temp");
+        match fs::read_to_string(&path) {
+            Ok(s) => {
+                if let Ok(millic) = s.trim().parse::<i32>() {
+                    let c = millic / 1000;
+                    max = Some(max.map_or(c, |m: i32| m.max(c)));
+                }
+            }
+            Err(_) => break,
+        }
+    }
+    max
+}
+
 fn read_core_freqs() -> Vec<f64> {
     let mut freqs = Vec::new();
     for i in 0.. {
@@ -148,6 +165,12 @@ fn emit_cpu(out: &mut impl Write, prev: &[Sample], curr: &[Sample], freqs: &[f64
     let _ = writeln!(out, "]}}");
 }
 
+fn emit_temp(out: &mut impl Write) {
+    if let Some(c) = read_temp_celsius() {
+        let _ = writeln!(out, "{{\"type\":\"temp\",\"celsius\":{c}}}");
+    }
+}
+
 fn emit_mem(out: &mut impl Write) {
     let content = fs::read_to_string("/proc/meminfo").unwrap_or_default();
     if let Some(m) = parse_meminfo(&content) {
@@ -190,6 +213,7 @@ fn main() {
 
         if tick.is_multiple_of(2) {
             emit_mem(&mut out);
+            emit_temp(&mut out);
         }
 
         let _ = out.flush();