show "Viewed Image" when the model views an image (#4475)

<img width="1022" height="339" alt="Screenshot 2025-09-29 at 4 22 00 PM"
src="https://github.com/user-attachments/assets/12da7358-19be-4010-a71b-496ede6dfbbf"
/>

codex-rs/protocol/src/protocol.rs

@@ -477,6 +477,9 @@ pub enum EventMsg {
 
     ExecCommandEnd(ExecCommandEndEvent),
 
+    /// Notification that the agent attached a local image via the view_image tool.
+    ViewImageToolCall(ViewImageToolCallEvent),
+
     ExecApprovalRequest(ExecApprovalRequestEvent),
 
     ApplyPatchApprovalRequest(ApplyPatchApprovalRequestEvent),
@@ -1074,6 +1077,14 @@ pub struct ExecCommandEndEvent {
     pub formatted_output: String,
 }
 
+#[derive(Debug, Clone, Deserialize, Serialize, TS)]
+pub struct ViewImageToolCallEvent {
+    /// Identifier for the originating tool call.
+    pub call_id: String,
+    /// Local filesystem path provided to the tool.
+    pub path: PathBuf,
+}
+
 #[derive(Debug, Clone, Deserialize, Serialize, PartialEq, TS)]
 #[serde(rename_all = "snake_case")]
 pub enum ExecOutputStream {