Guard destructive settings and radio actions

- Route reset campaign and tutorial replay through one reusable confirmation dialog; repeated presses cannot stack or emit twice.
- Keep emergency hold-to-send single-shot and cover the post-submit release.
- Add destructive-action regression checks, strings and documentation.

content/strings.en.json

@@ -121,7 +121,10 @@
   "ui.settings_reset_campaign": "Reset campaign",
   "ui.settings_controls_help": "Controls (click a binding, then press a key or pad button)",
   "ui.settings_cancel": "Cancel",
+  "ui.settings_reset_title": "Reset campaign",
   "ui.settings_reset_confirm": "Clear campaign progress and restart from the Hollywood Boulevard shift?",
+  "ui.settings_replay_title": "Replay tutorial",
+  "ui.settings_replay_confirm": "Replay the tutorial from the Hollywood Boulevard shift? The current shift will end.",
   "ui.settings_press": "Press…",
   "ui.pause_title": "Paused",
   "ui.pause_resume": "Resume",