ctrl+v image + @file accepts images (#1695)

allow ctrl+v in TUI for images + @file that are images are appended as
raw files (and read by the model) rather than pasted as a path that
cannot be read by the model.

Re-used components and same interface we're using for copying pasted
content in
72504f1d9c.
@aibrahim-oai as you've implemented this, mind having a look at this
one?


https://github.com/user-attachments/assets/c6c1153b-6b32-4558-b9a2-f8c57d2be710

---------

Co-authored-by: easong-openai <easong@openai.com>
Co-authored-by: Daniel Edrisian <dedrisian@openai.com>
Co-authored-by: Michael Bolin <mbolin@openai.com>

codex-rs/tui/src/lib.rs

@@ -30,6 +30,7 @@ mod bottom_pane;
 mod chatwidget;
 mod citation_regex;
 mod cli;
+mod clipboard_paste;
 mod common;
 pub mod custom_terminal;
 mod diff_render;