redbear-power: show refresh interval in keybar (e.g. [/]:500ms)

Track current poll_ms in App, update it on all three poll-change paths
([ / ] /Enter), and display it persistently in the keybar between
governor and tab hints.

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

@@ -146,6 +146,7 @@ pub struct App {
     /// file read. Fields degrade to `None` when unavailable.
     pub sched_stats: crate::sched::SchedStats,
     pub load_avg: Option<(f64, f64, f64)>,
+    pub poll_ms: u64,
     /// 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
@@ -456,6 +457,7 @@ impl App {
                     None
                 }
             }),
+            poll_ms: crate::app::POLL_MS,
             process_tree: false,
             show_full_cmdline: false,
             folded: std::collections::BTreeSet::new(),

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

@@ -319,6 +319,7 @@ fn main() -> io::Result<()> {
     } else {
         POLL_MS
     });
+    app.poll_ms = poll.as_millis() as u64;
     let mut show_help = false;
     // Tab/BackTab cycles keyboard focus between header / table / controls.
     let mut focused_panel: usize = 1;
@@ -1029,6 +1030,7 @@ fn main() -> io::Result<()> {
                         if poll_idx > 0 {
                             poll_idx -= 1;
                             poll = Duration::from_millis(POLL_STEPS_MS[poll_idx]);
+                            app.poll_ms = poll.as_millis() as u64;
                             app.flash_status(format!("refresh → {} ms", poll.as_millis()));
                         } else {
                             app.flash_status("refresh already at minimum (250 ms)");
@@ -1038,6 +1040,7 @@ fn main() -> io::Result<()> {
                         if poll_idx + 1 < POLL_STEPS_MS.len() {
                             poll_idx += 1;
                             poll = Duration::from_millis(POLL_STEPS_MS[poll_idx]);
+                            app.poll_ms = poll.as_millis() as u64;
                             app.flash_status(format!("refresh → {} ms", poll.as_millis()));
                         } else {
                             app.flash_status("refresh already at maximum (2000 ms)");
@@ -1064,6 +1067,7 @@ fn main() -> io::Result<()> {
                         if let Ok(ms) = raw.parse::<u64>() {
                             if (50..=60_000).contains(&ms) {
                                 poll = Duration::from_millis(ms);
+                                app.poll_ms = ms;
                                 poll_idx = POLL_STEPS_MS
                                     .iter()
                                     .position(|&v| v == ms)

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

@@ -2042,6 +2042,7 @@ pub fn render_cpu_table<'a>(
 
 pub fn render_keybar<'a>(app: &'a App) -> Paragraph<'a> {
     let gov = format!(" g:{}", app.cpufreq.active.as_str());
+    let interval = format!(" [/]:{}ms", app.poll_ms);
     let tab_hints: &str = if app.current_tab == crate::app::TabId::Process {
         " ↑↓:sel  k:kill  N:nice  l:files  C:cmd  o:sort  i:invert  F:filter  y:tree  Enter:detail"
     } else {
@@ -2049,6 +2050,7 @@ pub fn render_keybar<'a>(app: &'a App) -> Paragraph<'a> {
     };
     let mut parts = vec![
         gov,
+        interval,
         tab_hints.to_string(),
         " T:tab  ?:help  e:expand  f:freeze  q:quit".to_string(),
     ];