Fix thread settings clippy failure (#23724)

## Why

`main` picked up two small Rust build failures after nearby merges:

- #23507 added a real handler for
`ServerNotification::ThreadSettingsUpdated`, but the same variant was
still listed in the ignored-notification match arm. Full Clippy runs
treat the resulting unreachable-pattern warning as an error.
- #23666 added `turn_id` and `truncation_policy` to
`codex_tools::ToolCall`, while the goal extension backend test fixtures
from the goal-extension work still used the old shape. That left
`codex-goal-extension` tests unable to compile once the branches met on
`main`.

## What changed

Removed the duplicate `ThreadSettingsUpdated` match pattern from
`tui/src/chatwidget/protocol.rs`.

Updated the goal extension test `tool_call` helper to populate the new
`ToolCall` fields, and reused that helper for the one direct literal
that still had the old field list.

## Verification

- `just fix -p codex-tui`
- `cargo test -p codex-goal-extension`

codex-rs/ext/goal/tests/goal_extension_backend.rs

@@ -12,7 +12,6 @@ use codex_extension_api::ToolCallOutcome;
 use codex_extension_api::ToolCallSource;
 use codex_extension_api::ToolExecutor;
 use codex_extension_api::ToolFinishInput;
-use codex_extension_api::ToolName;
 use codex_extension_api::ToolPayload;
 use codex_extension_api::TurnStartInput;
 use codex_extension_api::TurnStopInput;
@@ -27,6 +26,7 @@ use codex_protocol::protocol::SessionSource;
 use codex_protocol::protocol::ThreadGoalStatus;
 use codex_protocol::protocol::TokenUsage;
 use codex_protocol::protocol::TokenUsageInfo;
+use codex_protocol::protocol::TruncationPolicy;
 use pretty_assertions::assert_eq;
 use serde_json::json;
 use tempfile::TempDir;
@@ -39,17 +39,14 @@ async fn installed_goal_tools_create_goal_and_fill_empty_preview() -> anyhow::Re
     let tools = installed_tools(runtime.clone(), thread_id).await;
 
     let create_tool = tool_by_name(&tools, "create_goal");
-    let invocation = ToolCall {
-        call_id: "call-create-goal".to_string(),
-        tool_name: ToolName::plain("create_goal"),
-        payload: ToolPayload::Function {
-            arguments: json!({
-                "objective": "ship goal extension backend",
-                "token_budget": 123,
-            })
-            .to_string(),
-        },
-    };
+    let invocation = tool_call(
+        "create_goal",
+        "call-create-goal",
+        json!({
+            "objective": "ship goal extension backend",
+            "token_budget": 123,
+        }),
+    );
     let output = create_tool.handle(invocation.clone()).await?;
     let result = output.code_mode_result(&invocation.payload);
     assert_eq!(
@@ -534,8 +531,10 @@ fn tool_by_name<'a>(
 
 fn tool_call(tool_name: &str, call_id: &str, arguments: serde_json::Value) -> ToolCall {
     ToolCall {
+        turn_id: "turn-1".to_string(),
         call_id: call_id.to_string(),
         tool_name: codex_extension_api::ToolName::plain(tool_name),
+        truncation_policy: TruncationPolicy::Bytes(1024),
         payload: ToolPayload::Function {
             arguments: arguments.to_string(),
         },

codex-rs/tui/src/chatwidget/protocol.rs

@@ -220,7 +220,6 @@ impl ChatWidget {
             | ServerNotification::AccountRateLimitsUpdated(_)
             | ServerNotification::ThreadStarted(_)
             | ServerNotification::ThreadStatusChanged(_)
-            | ServerNotification::ThreadSettingsUpdated(_)
             | ServerNotification::ThreadArchived(_)
             | ServerNotification::ThreadUnarchived(_)
             | ServerNotification::RawResponseItemCompleted(_)