Append full raw reasoning event text (#3605)

We don't emit correct delta events and only get full reasoning back.
Append it to history.

codex-rs/tui/src/chatwidget.rs

@@ -1037,8 +1037,9 @@ impl ChatWidget {
             | EventMsg::AgentReasoningRawContentDelta(AgentReasoningRawContentDeltaEvent {
                 delta,
             }) => self.on_agent_reasoning_delta(delta),
-            EventMsg::AgentReasoning(AgentReasoningEvent { .. })
-            | EventMsg::AgentReasoningRawContent(AgentReasoningRawContentEvent { .. }) => {
+            EventMsg::AgentReasoning(AgentReasoningEvent { .. }) => self.on_agent_reasoning_final(),
+            EventMsg::AgentReasoningRawContent(AgentReasoningRawContentEvent { text }) => {
+                self.on_agent_reasoning_delta(text);
                 self.on_agent_reasoning_final()
             }
             EventMsg::AgentReasoningSectionBreak(_) => self.on_reasoning_section_break(),