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/chatwidget/snapshots/codex_tui__chatwidget__tests__chat_small_idle_h2.snap

@@ -3,4 +3,4 @@ source: tui/src/chatwidget/tests.rs
 expression: terminal.backend()
 ---
 "▌ Ask Codex to do anything              "
-" ⏎ send   Ctrl+J newline   Ctrl+T transc"
+" ⏎ send   ⌃J newline   ⌃T transcript   ⌃"

codex-rs/tui/src/chatwidget/snapshots/codex_tui__chatwidget__tests__chatwidget_exec_and_status_layout_vt100_snapshot.snap

@@ -12,4 +12,4 @@ expression: visual
  Investigating rendering code (0s • Esc to interrupt)
 
 ▌Summarize recent commits
- ⏎ send   Ctrl+J newline   Ctrl+T transcript   Ctrl+C quit
+ ⏎ send   ⌃J newline   ⌃T transcript   ⌃C quit

codex-rs/tui/src/chatwidget/snapshots/codex_tui__chatwidget__tests__status_widget_active.snap

@@ -6,5 +6,5 @@ expression: terminal.backend()
 " Analyzing (0s • Esc to interrupt)                                              "
 "                                                                                "
 "▌ Ask Codex to do anything                                                      "
-" ⏎ send   Ctrl+J newline   Ctrl+T transcript   Ctrl+C quit                      "
+" ⏎ send   ⌃J newline   ⌃T transcript   ⌃C quit                                  "
 "                                                                                "

codex-rs/tui/src/chatwidget/tests.rs

@@ -1075,8 +1075,6 @@ fn apply_patch_manual_approval_adjusts_header() {
 
 #[test]
 fn apply_patch_manual_flow_snapshot() {
-    use insta::assert_snapshot;
-
     let (mut chat, mut rx, _op_rx) = make_chatwidget_manual();
 
     let mut proposed_changes = HashMap::new();
@@ -1647,5 +1645,5 @@ fn chatwidget_exec_and_status_layout_vt100_snapshot() {
     }
 
     let visual = vt_lines.join("\n");
-    insta::assert_snapshot!(visual);
+    assert_snapshot!(visual);
 }