tui: plumb permission profile selection (#23708)

## Why

The named-profile `/permissions` picker needs a small TUI action path
that can select permission profiles without folding the menu UI and
profile metadata into the same review.

## What changed

- Carry permission-profile selections through the TUI app event flow.
- Persist selected profiles while preserving the existing approval
settings and guardrail prompts.
- Keep the legacy `/permissions` picker behavior in this layer; the
profile-mode menu stays in the follow-up PR.

## Stack

1. [#22931](https://github.com/openai/codex/pull/22931):
runtime/session/network propagation for active permission profiles.
2. **This PR**: TUI selection plumbing and guardrail flow.
3. [#21559](https://github.com/openai/codex/pull/21559): profile-aware
`/permissions` menu and custom profile display.

<img width="1632" height="1186" alt="image"
src="https://github.com/user-attachments/assets/69ddcd5e-b57c-468d-8c1d-246916323c15"
/>

## Validation

- `git diff --cached --check` before commit.
- Full test run skipped at the user request while pushing the split
stack.

codex-rs/tui/src/app.rs

@@ -10,6 +10,7 @@ use crate::app_event::AppEvent;
 use crate::app_event::ExitMode;
 use crate::app_event::FeedbackCategory;
 use crate::app_event::HistoryLookupResponse;
+use crate::app_event::PermissionProfileSelection;
 use crate::app_event::RateLimitRefreshOrigin;
 use crate::app_event::RealtimeAudioDeviceKind;
 #[cfg(target_os = "windows")]
@@ -484,7 +485,7 @@ pub(crate) struct App {
     harness_overrides: ConfigOverrides,
     loader_overrides: LoaderOverrides,
     runtime_approval_policy_override: Option<AskForApproval>,
-    runtime_permission_profile_override: Option<PermissionProfile>,
+    runtime_permission_profile_override: Option<RuntimePermissionProfileOverride>,
 
     pub(crate) file_search: FileSearchManager,
 
@@ -554,6 +555,23 @@ pub(crate) struct App {
     pending_hook_enabled_writes: HashMap<String, Option<bool>>,
 }
 
+#[derive(Debug, Clone, PartialEq)]
+struct RuntimePermissionProfileOverride {
+    permission_profile: PermissionProfile,
+    active_permission_profile: Option<ActivePermissionProfile>,
+    network: Option<crate::legacy_core::config::NetworkProxySpec>,
+}
+
+impl RuntimePermissionProfileOverride {
+    fn from_config(config: &Config) -> Self {
+        Self {
+            permission_profile: config.permissions.permission_profile().clone(),
+            active_permission_profile: config.permissions.active_permission_profile(),
+            network: config.permissions.network.clone(),
+        }
+    }
+}
+
 fn active_turn_not_steerable_turn_error(error: &TypedRequestError) -> Option<AppServerTurnError> {
     let TypedRequestError::Server { source, .. } = error else {
         return None;