Add persistent Shift+Tab reasoning speed toggle

Shift+Tab now toggles between high reasoning on Fast mode and xhigh reasoning on the standard tier when Fast mode is available. The toggle updates the active turn context and persists both reasoning effort and service tier defaults.

Verified with focused TUI keybinding tests, footer snapshot coverage, scoped clippy fix, and release-fast build for 0.130.9.

Co-authored-by: Open Codex <hff582580@gmail.com>

Author: LEON-gittech

codex-cli/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@leonw24/open-codex",
-  "version": "0.130.8",
+  "version": "0.130.9",
   "license": "Apache-2.0",
   "bin": {
     "open-codex": "bin/codex.js"