Use ⌥⇧⌃ glyphs for key hints on mac (#3143)

#### Summary
- render the edit queued message shortcut with the ⌥ modifier on macOS
builds
- add a helper for status indicator snapshot suffixes
- record macOS-specific snapshots for the status indicator widget

codex-rs/tui/src/lib.rs

@@ -42,6 +42,7 @@ mod file_search;
 mod get_git_diff;
 mod history_cell;
 pub mod insert_history;
+mod key_hint;
 pub mod live_wrap;
 mod markdown;
 mod markdown_stream;