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/tui/src/history_cell.rs

@@ -1,4 +1,5 @@
 use crate::diff_render::create_diff_summary;
+use crate::diff_render::display_path_for;
 use crate::exec_cell::CommandOutput;
 use crate::exec_cell::OutputLinesParams;
 use crate::exec_cell::TOOL_CALL_MAX_LINES;
@@ -1037,6 +1038,17 @@ pub(crate) fn new_patch_apply_failure(stderr: String) -> PlainHistoryCell {
     PlainHistoryCell { lines }
 }
 
+pub(crate) fn new_view_image_tool_call(path: PathBuf, cwd: &Path) -> PlainHistoryCell {
+    let display_path = display_path_for(&path, cwd);
+
+    let lines: Vec<Line<'static>> = vec![
+        vec!["• ".dim(), "Viewed Image".bold()].into(),
+        vec!["  └ ".dim(), display_path.dim()].into(),
+    ];
+
+    PlainHistoryCell { lines }
+}
+
 pub(crate) fn new_reasoning_block(
     full_reasoning_buffer: String,
     config: &Config,