Remove context status-line meter (#17420)

Addresses #17313

Problem: The visual context meter in the status line was confusing and
continued to draw negative feedback, and context reporting should remain
an explicit opt-in rather than part of the default footer.

Solution: Remove the visual meter, restore opt-in context remaining/used
percentage items that explicitly say "Context", keep existing
context-usage configs working as a hidden alias, and update the setup
text and snapshots.

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

@@ -12,7 +12,7 @@
 //! - Model information (name, reasoning level)
 //! - Directory paths (current dir, project root)
 //! - Git information (branch name)
-//! - Context usage (meter, window size)
+//! - Context usage (remaining %, used %, window size)
 //! - Usage limits (5-hour, weekly)
 //! - Session info (thread title, ID, tokens used)
 //! - Application version
@@ -22,6 +22,7 @@ use ratatui::layout::Rect;
 use ratatui::text::Line;
 use std::collections::BTreeMap;
 use std::collections::HashSet;
+use strum::IntoEnumIterator;
 use strum_macros::Display;
 use strum_macros::EnumIter;
 use strum_macros::EnumString;
@@ -62,15 +63,14 @@ pub(crate) enum StatusLineItem {
     /// Current git branch name (if in a repository).
     GitBranch,
 
-    /// Visual meter of context window usage.
+    /// Percentage of context window remaining.
+    ContextRemaining,
+
+    /// Percentage of context window used.
     ///
-    /// Also accepts legacy `context-remaining` and `context-used` config values.
-    #[strum(
-        to_string = "context-usage",
-        serialize = "context-remaining",
-        serialize = "context-used"
-    )]
-    ContextUsage,
+    /// Also accepts the legacy `context-usage` config value.
+    #[strum(to_string = "context-used", serialize = "context-usage")]
+    ContextUsed,
 
     /// Remaining usage on the 5-hour rate limit.
     FiveHourLimit,
@@ -112,8 +112,11 @@ impl StatusLineItem {
             StatusLineItem::CurrentDir => "Current working directory",
             StatusLineItem::ProjectRoot => "Project root directory (omitted when unavailable)",
             StatusLineItem::GitBranch => "Current Git branch (omitted when unavailable)",
-            StatusLineItem::ContextUsage => {
-                "Visual meter of context window usage (omitted when unknown)"
+            StatusLineItem::ContextRemaining => {
+                "Percentage of context window remaining (omitted when unknown)"
+            }
+            StatusLineItem::ContextUsed => {
+                "Percentage of context window used (omitted when unknown)"
             }
             StatusLineItem::FiveHourLimit => {
                 "Remaining usage on 5-hour usage limit (omitted when unavailable)"
@@ -137,25 +140,6 @@ impl StatusLineItem {
     }
 }
 
-const SELECTABLE_STATUS_LINE_ITEMS: &[StatusLineItem] = &[
-    StatusLineItem::ModelName,
-    StatusLineItem::ModelWithReasoning,
-    StatusLineItem::CurrentDir,
-    StatusLineItem::ProjectRoot,
-    StatusLineItem::GitBranch,
-    StatusLineItem::ContextUsage,
-    StatusLineItem::FiveHourLimit,
-    StatusLineItem::WeeklyLimit,
-    StatusLineItem::CodexVersion,
-    StatusLineItem::ContextWindowSize,
-    StatusLineItem::UsedTokens,
-    StatusLineItem::TotalInputTokens,
-    StatusLineItem::TotalOutputTokens,
-    StatusLineItem::SessionId,
-    StatusLineItem::FastMode,
-    StatusLineItem::ThreadTitle,
-];
-
 /// Runtime values used to preview the current status-line selection.
 #[derive(Clone, Debug, Default, Eq, PartialEq)]
 pub(crate) struct StatusLinePreviewData {
@@ -232,7 +216,7 @@ impl StatusLineSetupView {
             }
         }
 
-        for item in SELECTABLE_STATUS_LINE_ITEMS.iter().cloned() {
+        for item in StatusLineItem::iter() {
             let item_id = item.to_string();
             if used_ids.contains(&item_id) {
                 continue;
@@ -317,19 +301,27 @@ mod tests {
     use crate::app_event::AppEvent;
 
     #[test]
-    fn context_usage_is_canonical_and_accepts_legacy_ids() {
-        assert_eq!(StatusLineItem::ContextUsage.to_string(), "context-usage");
-        assert_eq!(
-            "context-usage".parse::<StatusLineItem>(),
-            Ok(StatusLineItem::ContextUsage)
-        );
-        assert_eq!(
-            "context-remaining".parse::<StatusLineItem>(),
-            Ok(StatusLineItem::ContextUsage)
-        );
+    fn context_used_accepts_context_usage_legacy_id() {
+        assert_eq!(StatusLineItem::ContextUsed.to_string(), "context-used");
         assert_eq!(
             "context-used".parse::<StatusLineItem>(),
-            Ok(StatusLineItem::ContextUsage)
+            Ok(StatusLineItem::ContextUsed)
+        );
+        assert_eq!(
+            "context-usage".parse::<StatusLineItem>(),
+            Ok(StatusLineItem::ContextUsed)
+        );
+    }
+
+    #[test]
+    fn context_remaining_is_separate_selectable_id() {
+        assert_eq!(
+            "context-remaining".parse::<StatusLineItem>(),
+            Ok(StatusLineItem::ContextRemaining)
+        );
+        assert_eq!(
+            StatusLineItem::ContextRemaining.to_string(),
+            "context-remaining"
         );
     }