chore: fix grammar mistakes (#6326)

codex-rs/common/src/model_presets.rs

@@ -56,7 +56,7 @@ const PRESETS: &[ModelPreset] = &[
         id: "gpt-5-codex-mini",
         model: "gpt-5-codex-mini",
         display_name: "gpt-5-codex-mini",
-        description: "Optimized for codex. Cheaper, faster, and less capable.",
+        description: "Optimized for codex. Cheaper, faster, but less capable.",
         default_reasoning_effort: ReasoningEffort::Medium,
         supported_reasoning_efforts: &[
             ReasoningEffortPreset {

codex-rs/tui/src/chatwidget.rs

@@ -1773,9 +1773,7 @@ impl ChatWidget {
 
         self.bottom_pane.show_selection_view(SelectionViewParams {
             title: Some("Approaching rate limits".to_string()),
-            subtitle: Some(format!(
-                "You've used over 90% of your limit. Switch to {display_name} for lower credit usage?"
-            )),
+            subtitle: Some(format!("Switch to {display_name} for lower credit usage?")),
             footer_hint: Some(standard_popup_hint_line()),
             items,
             ..Default::default()

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

@@ -1,12 +1,11 @@
 ---
 source: tui/src/chatwidget/tests.rs
-assertion_line: 480
 expression: popup
 ---
   Approaching rate limits
-  You've used over 90% of your limit. Switch to gpt-5-codex-mini for lower cre
+  Switch to gpt-5-codex-mini for lower credit usage?
 
-› 1. Switch to gpt-5-codex-mini  Optimized for codex. Cheaper, faster, and
+› 1. Switch to gpt-5-codex-mini  Optimized for codex. Cheaper, faster, but
                                  less capable.
   2. Keep current model