redbear-power: add system load average (1/5/15 min) to System panel

Reads /proc/loadavg every 4th refresh cycle and displays the three
load average values alongside Cores/AvgFreq/MaxTemp/TotalPkg.

local/recipes/system/redbear-power/source/src/app.rs

@@ -145,6 +145,7 @@ pub struct App {
     /// `/proc/stat` (Linux). Read every tick — it's a single
     /// file read. Fields degrade to `None` when unavailable.
     pub sched_stats: crate::sched::SchedStats,
+    pub load_avg: Option<(f64, f64, f64)>,
     /// When true, render the Process tab as a tree (parents above
     /// children, prefixed with `├─ ` / `└─ ` connector characters).
     /// Toggled by the `T` hotkey. Sort modes are honored within
@@ -443,6 +444,18 @@ impl App {
             process_sort: crate::process::SortMode::default(),
             process_filter: String::new(),
             sched_stats: crate::sched::SchedStats::default(),
+            load_avg: std::fs::read_to_string("/proc/loadavg").ok().and_then(|s| {
+                let parts: Vec<&str> = s.split_whitespace().collect();
+                if parts.len() >= 3 {
+                    Some((
+                        parts[0].parse().ok()?,
+                        parts[1].parse().ok()?,
+                        parts[2].parse().ok()?,
+                    ))
+                } else {
+                    None
+                }
+            }),
             process_tree: false,
             show_full_cmdline: false,
             folded: std::collections::BTreeSet::new(),
@@ -557,6 +570,18 @@ impl App {
         if self.refresh_counter % 4 == 0 {
             self.meminfo = crate::meminfo::read_meminfo();
             self.os_info = crate::meminfo::read_os_info();
+            self.load_avg = std::fs::read_to_string("/proc/loadavg").ok().and_then(|s| {
+                let parts: Vec<&str> = s.split_whitespace().collect();
+                if parts.len() >= 3 {
+                    Some((
+                        parts[0].parse().ok()?,
+                        parts[1].parse().ok()?,
+                        parts[2].parse().ok()?,
+                    ))
+                } else {
+                    None
+                }
+            });
         }
 
         // Battery state changes continuously on a laptop (capacity drops,

local/recipes/system/redbear-power/source/src/render.rs

@@ -426,6 +426,11 @@ pub fn render_system_panel<'a>(app: &'a App, focused: bool) -> Paragraph<'a> {
         max_temp.set_style(theme::VALUE),
         "  TotalPkg: ".set_style(theme::LABEL),
         format!("{total_pkgw:.1} W").set_style(theme::VALUE),
+        "  Load: ".set_style(theme::LABEL),
+        match app.load_avg {
+            Some((a, b, c)) => format!("{a:.2} {b:.2} {c:.2}").set_style(theme::VALUE),
+            None => "n/a".set_style(theme::VALUE_OFF),
+        },
     ]));
     let any_prochot = app.cpus.iter().any(|c| c.prochot);
     let any_critical = app.cpus.iter().any(|c| c.critical);