Add text element metadata to types (#9235)

Initial type tweaking PR to make the diff of
https://github.com/openai/codex/pull/9116 smaller

This should not change any behavior, just adds some fields to types

codex-rs/debug-client/src/client.rs

@@ -184,7 +184,11 @@ impl AppServerClient {
             request_id: request_id.clone(),
             params: TurnStartParams {
                 thread_id: thread_id.to_string(),
-                input: vec![UserInput::Text { text }],
+                input: vec![UserInput::Text {
+                    text,
+                    // Plain text conversion has no UI element ranges.
+                    text_elements: Vec::new(),
+                }],
                 ..Default::default()
             },
         };