tui: • Working, 100% context dim (#4629)

- add a `•` before the "Working" shimmer
- make the percentage in "X% context left" dim instead of bold

<img width="751" height="480" alt="Screenshot 2025-10-02 at 2 29 57 PM"
src="https://github.com/user-attachments/assets/cf3e771f-ddb3-48f4-babe-1eaf1f0c2959"
/>

codex-rs/tui/src/bottom_pane/footer.rs

@@ -222,7 +222,7 @@ fn context_window_line(percent: Option<u8>) -> Line<'static> {
     let mut spans: Vec<Span<'static>> = Vec::new();
     match percent {
         Some(percent) => {
-            spans.push(format!("{percent}%").bold());
+            spans.push(format!("{percent}%").dim());
             spans.push(" context left".dim());
         }
         None => {

codex-rs/tui/src/bottom_pane/mod.rs

@@ -716,8 +716,8 @@ mod tests {
             top.push(buf[(x, 1)].symbol().chars().next().unwrap_or(' '));
         }
         assert!(
-            top.trim_start().starts_with("Working"),
-            "expected top row to start with 'Working': {top:?}"
+            top.trim_start().starts_with("• Working"),
+            "expected top row to start with '• Working': {top:?}"
         );
         assert!(
             top.contains("Working"),

codex-rs/tui/src/chatwidget/snapshots/codex_tui__chatwidget__tests__chat_small_running_h2.snap

@@ -2,5 +2,5 @@
 source: tui/src/chatwidget/tests.rs
 expression: terminal.backend()
 ---
-"  Thinking (0s • esc to interrupt)      "
+"• Thinking (0s • esc to interrupt)      "
 "› Ask Codex to do anything              "

codex-rs/tui/src/chatwidget/snapshots/codex_tui__chatwidget__tests__chatwidget_exec_and_status_layout_vt100_snapshot.snap

@@ -9,7 +9,7 @@ expression: term.backend().vt100().screen().contents()
   └ Search Change Approved
     Read diff_render.rs
 
-  Investigating rendering code (0s • esc to interrupt)
+• Investigating rendering code (0s • esc to interrupt)
 
 
 › Summarize recent commits

codex-rs/tui/src/chatwidget/snapshots/codex_tui__chatwidget__tests__status_widget_active.snap

@@ -3,7 +3,7 @@ source: tui/src/chatwidget/tests.rs
 expression: terminal.backend()
 ---
 "                                                                                "
-"  Analyzing (0s • esc to interrupt)                                             "
+"• Analyzing (0s • esc to interrupt)                                             "
 "                                                                                "
 "                                                                                "
 "› Ask Codex to do anything                                                      "

codex-rs/tui/src/diff_render.rs

@@ -146,7 +146,7 @@ fn render_changes_block(rows: Vec<Row>, wrap_cols: usize, cwd: &Path) -> Vec<RtL
     let total_removed: usize = rows.iter().map(|r| r.removed).sum();
     let file_count = rows.len();
     let noun = if file_count == 1 { "file" } else { "files" };
-    let mut header_spans: Vec<RtSpan<'static>> = vec!["• ".into()];
+    let mut header_spans: Vec<RtSpan<'static>> = vec!["• ".dim()];
     if let [row] = &rows[..] {
         let verb = match &row.change {
             FileChange::Add { .. } => "Added",

codex-rs/tui/src/history_cell.rs

@@ -994,7 +994,7 @@ impl HistoryCell for PlanUpdateCell {
                 indented_lines.extend(render_step(status, step));
             }
         }
-        lines.extend(prefix_lines(indented_lines, "  └ ".into(), "    ".into()));
+        lines.extend(prefix_lines(indented_lines, "  └ ".dim(), "    ".into()));
 
         lines
     }

codex-rs/tui/src/snapshots/codex_tui__status_indicator_widget__tests__renders_truncated.snap

@@ -2,5 +2,5 @@
 source: tui/src/status_indicator_widget.rs
 expression: terminal.backend()
 ---
-"  Working (0s • esc "
+"• Working (0s • esc "
 "                    "

codex-rs/tui/src/snapshots/codex_tui__status_indicator_widget__tests__renders_with_queued_messages.snap

@@ -2,7 +2,7 @@
 source: tui/src/status_indicator_widget.rs
 expression: terminal.backend()
 ---
-"  Working (0s • esc to interrupt)                                               "
+"• Working (0s • esc to interrupt)                                               "
 "                                                                                "
 " ↳ first                                                                        "
 " ↳ second                                                                       "

codex-rs/tui/src/snapshots/codex_tui__status_indicator_widget__tests__renders_with_working_header.snap

@@ -2,5 +2,5 @@
 source: tui/src/status_indicator_widget.rs
 expression: terminal.backend()
 ---
-"  Working (0s • esc to interrupt)                                               "
+"• Working (0s • esc to interrupt)                                               "
 "                                                                                "

codex-rs/tui/src/status_indicator_widget.rs

@@ -160,7 +160,7 @@ impl WidgetRef for StatusIndicatorWidget {
         let pretty_elapsed = fmt_elapsed_compact(elapsed);
 
         // Plain rendering: no borders or padding so the live cell is visually indistinguishable from terminal scrollback.
-        let mut spans = vec!["  ".into()];
+        let mut spans = vec!["• ".dim()];
         spans.extend(shimmer_spans(&self.header));
         spans.extend(vec![
             " ".into(),