feat: display localtime in dashboard fields

Converts UTC to user's localtime in the History and Peers screens.

src/bin/dashboard_src/history_screen.rs

@@ -1,11 +1,10 @@
 use std::{
     cmp::{max, min},
     sync::{Arc, Mutex},
-    time::{Duration, UNIX_EPOCH},
+    time::Duration,
 };
 
 use super::{dashboard_app::DashboardEvent, screen::Screen};
-use chrono::{DateTime, Utc};
 use crossterm::event::{Event, KeyCode, KeyEventKind};
 use itertools::Itertools;
 use neptune_core::{
@@ -265,10 +264,10 @@ impl Widget for HistoryScreen {
             .iter()
             .rev()
             .map(|bu| {
-                let (height, duration, amount, sign, balance) = *bu;
+                let (height, timestamp, amount, sign, balance) = *bu;
                 vec![
                     height.to_string(),
-                    DateTime::<Utc>::from(UNIX_EPOCH + duration).to_string(),
+                    neptune_core::utc_timestamp_to_localtime(timestamp.as_millis()).to_string(),
                     if sign == Sign::NonNegative {
                         "↘".to_string()
                     } else {

src/bin/dashboard_src/peers_screen.rs

@@ -5,7 +5,6 @@ use std::{
 };
 
 use super::{dashboard_app::DashboardEvent, screen::Screen};
-use chrono::{DateTime, Utc};
 use itertools::Itertools;
 use neptune_core::{models::peer::PeerInfo, rpc_server::RPCClient};
 use ratatui::{
@@ -177,12 +176,12 @@ impl Widget for PeersScreen {
             .map(|pi| {
                 let latest_violation: Option<String> =
                     pi.standing.latest_sanction.map(|x| x.to_string());
-                let formatted_datetime = DateTime::<Utc>::from(pi.last_seen)
-                    .format("%Y-%m-%d %H:%M")
-                    .to_string();
+                let last_seen_timestamp =
+                    pi.last_seen.duration_since(std::time::UNIX_EPOCH).unwrap();
                 vec![
                     pi.connected_address.to_string(),
-                    formatted_datetime,
+                    neptune_core::utc_timestamp_to_localtime(last_seen_timestamp.as_millis())
+                        .to_string(),
                     pi.standing.standing.to_string(),
                     if pi.is_archival_node {
                         "✓".to_string()

src/lib.rs

@@ -285,7 +285,7 @@ where
     (output, total_time)
 }
 
-/// Converts a UTC timestamp (seconds since 1970 UTC) into
+/// Converts a UTC millisecond timestamp (millis since 1970 UTC) into
 /// a `DateTime<Local>`, ie local-time.
 pub fn utc_timestamp_to_localtime<T>(timestamp: T) -> DateTime<Local>
 where