voice transcription (#3381)

Adds voice transcription on press-and-hold of spacebar.


https://github.com/user-attachments/assets/85039314-26f3-46d1-a83b-8c4a4a1ecc21

---------

Co-authored-by: Codex <199175422+chatgpt-codex-connector[bot]@users.noreply.github.com>
Co-authored-by: David Zbarsky <zbarsky@openai.com>

codex-rs/tui/src/app_event.rs

@@ -321,6 +321,29 @@ pub(crate) enum AppEvent {
     /// Re-open the permissions presets popup.
     OpenPermissionsPopup,
 
+    /// Live update for the in-progress voice recording placeholder. Carries
+    /// the placeholder `id` and the text to display (e.g., an ASCII meter).
+    #[cfg(not(target_os = "linux"))]
+    UpdateRecordingMeter {
+        id: String,
+        text: String,
+    },
+
+    /// Voice transcription finished for the given placeholder id.
+    #[cfg(not(target_os = "linux"))]
+    TranscriptionComplete {
+        id: String,
+        text: String,
+    },
+
+    /// Voice transcription failed; remove the placeholder identified by `id`.
+    #[cfg(not(target_os = "linux"))]
+    TranscriptionFailed {
+        id: String,
+        #[allow(dead_code)]
+        error: String,
+    },
+
     /// Open the branch picker option from the review popup.
     OpenReviewBranchPicker(PathBuf),