Add durable user-message queue dispatch (#37204)

## What changed

- Add a storage-neutral queue extension for listing, adding, editing, reordering, deleting, and explicitly starting queued user messages.
- Dispatch queued messages in FIFO order when a thread becomes idle after a completed turn, while leaving them queued after interruptions or failures.
- Wait for user input to be persisted before removing its queue item, and report hook rejection, task termination, and persistence failures distinctly.
- Snapshot local image and audio attachments into validated data URLs before storing them, enforce input limits, and emit `ThreadQueueChanged` events after mutations.

## Testing

- Cover queue mutations, automatic and explicit dispatch, interruption and failure behavior, hook rejection, invalid records, input limits, and local attachment snapshotting.

GitOrigin-RevId: 14f39d7c8cbaccb767a6da84b82cced0edfcb4b9

codex-rs/core/src/session/inject.rs

@@ -123,6 +123,9 @@ impl Session {
             ));
         }
 
+        let (input_persisted_sender, input_persisted_receiver) =
+            has_user_input.then(tokio::sync::oneshot::channel).unzip();
+        let original_input = input.clone();
         let task_input = if has_user_input {
             self.clear_connector_selection().await;
             for item in &input {
@@ -141,9 +144,18 @@ impl Session {
             turn_context,
             task_input,
             RegularTask::new(),
+            input_persisted_sender,
             MailboxParentProvenance::Ignore,
         )
         .await;
+        if let Some(receiver) = input_persisted_receiver {
+            return receiver
+                .await
+                .unwrap_or(Err(
+                    TryStartTurnIfIdleRejectionReason::TaskEndedBeforePersistence,
+                ))
+                .map_err(|reason| TryStartTurnIfIdleError::new(reason, original_input));
+        }
         Ok(())
     }