Update render name in tui for approval_policy to match with config values (#1675)

Currently, codex on start shows the value for the approval policy as
name of
[AskForApproval](2437a8d17a/codex-rs/core/src/protocol.rs (L128))
enum, which differs from
[approval_policy](2437a8d17a/codex-rs/config.md (approval_policy))
config values.
E.g. "untrusted" becomes "UnlessTrusted", "on-failure" -> "OnFailure",
"never" -> "Never".
This PR changes render names of the approval policy to match with
configuration values.

codex-rs/core/src/protocol.rs

@@ -11,6 +11,7 @@ use std::str::FromStr;
 use mcp_types::CallToolResult;
 use serde::Deserialize;
 use serde::Serialize;
+use strum_macros::Display;
 use uuid::Uuid;
 
 use crate::config_types::ReasoningEffort as ReasoningEffortConfig;
@@ -123,14 +124,16 @@ pub enum Op {
 
 /// Determines the conditions under which the user is consulted to approve
 /// running the command proposed by Codex.
-#[derive(Debug, Clone, Copy, Default, PartialEq, Eq, Hash, Serialize, Deserialize)]
+#[derive(Debug, Clone, Copy, Default, PartialEq, Eq, Hash, Serialize, Deserialize, Display)]
 #[serde(rename_all = "kebab-case")]
+#[strum(serialize_all = "kebab-case")]
 pub enum AskForApproval {
     /// Under this policy, only "known safe" commands—as determined by
     /// `is_safe_command()`—that **only read files** are auto‑approved.
     /// Everything else will ask the user to approve.
     #[default]
     #[serde(rename = "untrusted")]
+    #[strum(serialize = "untrusted")]
     UnlessTrusted,
 
     /// *All* commands are auto‑approved, but they are expected to run inside a

codex-rs/exec/src/event_processor.rs

@@ -25,7 +25,7 @@ pub(crate) fn create_config_summary_entries(config: &Config) -> Vec<(&'static st
         ("workdir", config.cwd.display().to_string()),
         ("model", config.model.clone()),
         ("provider", config.model_provider_id.clone()),
-        ("approval", format!("{:?}", config.approval_policy)),
+        ("approval", config.approval_policy.to_string()),
         ("sandbox", summarize_sandbox_policy(&config.sandbox_policy)),
     ];
     if config.model_provider.wire_api == WireApi::Responses

codex-rs/tui/src/history_cell.rs

@@ -156,7 +156,7 @@ impl HistoryCell {
                 ("workdir", config.cwd.display().to_string()),
                 ("model", config.model.clone()),
                 ("provider", config.model_provider_id.clone()),
-                ("approval", format!("{:?}", config.approval_policy)),
+                ("approval", config.approval_policy.to_string()),
                 ("sandbox", summarize_sandbox_policy(&config.sandbox_policy)),
             ];
             if config.model_provider.wire_api == WireApi::Responses