Add "View Image" tool (#2723)

Adds a "View Image" tool so Codex can find and see images by itself:

<img width="1772" height="420" alt="Screenshot 2025-08-26 at 10 40
04 AM"
src="https://github.com/user-attachments/assets/7a459c7b-0b86-4125-82d9-05fbb35ade03"
/>

codex-rs/tui/src/lib.rs

@@ -128,6 +128,7 @@ pub async fn run_main(
         base_instructions: None,
         include_plan_tool: Some(true),
         include_apply_patch_tool: None,
+        include_view_image_tool: None,
         disable_response_storage: cli.oss.then_some(true),
         show_raw_agent_reasoning: cli.oss.then_some(true),
         tools_web_search_request: cli.web_search.then_some(true),