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.

src/test/tests/test_radio_panel.gd

@@ -35,5 +35,8 @@ func test_emergency_requires_hold() -> bool:
 	panel.action_button.button_down.emit()
 	panel._process(RadioPanel.HOLD_NEEDED + 0.1)
 	var c := TestUtils.check_eq(int(calls["count"]), 1, "full hold sends exactly once")
+	# Releasing after the hold has already submitted must not send again.
+	panel.action_button.button_up.emit()
+	var d := TestUtils.check_eq(int(calls["count"]), 1, "release after a completed hold does not double-send")
 	panel.free()
-	return a and b and c
+	return a and b and c and d

src/test/tests/test_session_shell.gd

@@ -96,6 +96,49 @@ func test_settings_panel_cancel_discards() -> bool:
 	panel.free()
 	return a and b
 
+func test_destructive_settings_require_confirmation() -> bool:
+	var panel: Node = SettingsPanel.new()
+	var tree := Engine.get_main_loop() as SceneTree
+	if tree:
+		tree.root.add_child(panel)
+	panel._build()
+	var resets := {"count": 0}
+	var replays := {"count": 0}
+	panel.reset_campaign_requested.connect(func(): resets["count"] += 1)
+	panel.replay_tutorial_requested.connect(func(): replays["count"] += 1)
+	var reset_button: Button = panel.find_child("ResetCampaignButton", true, false) as Button
+	if reset_button:
+		reset_button.pressed.emit()
+	var first: ConfirmationDialog = panel._destructive_dialog
+	panel._confirm_reset_campaign()
+	var a := TestUtils.check(first != null and panel._destructive_dialog == first,
+		"a second reset press reuses the open confirmation")
+	if first:
+		first.confirmed.emit()
+	var b := TestUtils.check_eq(resets["count"], 1, "reset emits once after confirmation")
+	var c := TestUtils.check(panel._destructive_dialog == null,
+		"the reset confirmation is dismissed after use")
+	var replay_button: Button = panel.find_child("ReplayTutorialButton", true, false) as Button
+	if replay_button:
+		replay_button.pressed.emit()
+	var replay_dialog: ConfirmationDialog = panel._destructive_dialog
+	var d := TestUtils.check_eq(replays["count"], 0,
+		"tutorial replay waits for confirmation")
+	if replay_dialog:
+		replay_dialog.confirmed.emit()
+	var e := TestUtils.check_eq(replays["count"], 1,
+		"tutorial replay emits once from its confirmation")
+	panel._confirm_replay_tutorial()
+	var cancel_dialog: ConfirmationDialog = panel._destructive_dialog
+	if cancel_dialog:
+		cancel_dialog.canceled.emit()
+	var f := TestUtils.check_eq(replays["count"], 1,
+		"canceling tutorial replay does not emit")
+	if tree:
+		tree.root.remove_child(panel)
+	panel.free()
+	return a and b and c and d and e and f
+
 func test_routine_traffic_is_ephemeral() -> bool:
 	var avatar: Node = NpcAvatar.new()
 	var a := TestUtils.check(avatar.ephemeral, "avatars default to ephemeral")