Make Privacy settings interactive (accept policy + fiat toggle)

Tap to cycle the incoming-payment accept policy (Anyone/Contacts/Ask) and to
toggle the fiat USD preview, completing the user-control story for settings.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/gui/views/goblin/mod.rs

@@ -581,7 +581,19 @@ impl GoblinWalletView {
 			.show(ui, |ui| {
 				settings_group(ui, "Privacy", |ui| {
 					settings_row(ui, "Tor routing", "All payments routed over Tor");
-					settings_row(ui, "Auto-accept", accept_policy_label(wallet));
+					// Tap to cycle the incoming-payment accept policy.
+					if settings_row_btn(ui, "Auto-accept", accept_policy_label(wallet)) {
+						cycle_accept_policy(wallet);
+					}
+					// Tap to toggle the fiat (USD) preview.
+					let fiat = if crate::AppConfig::fiat_preview() {
+						"On"
+					} else {
+						"Off"
+					};
+					if settings_row_btn(ui, "Fiat preview (USD)", fiat) {
+						crate::AppConfig::toggle_fiat_preview();
+					}
 				});
 				ui.add_space(16.0);
 
@@ -921,6 +933,19 @@ fn accept_policy_label(wallet: &Wallet) -> &'static str {
 		.unwrap_or("Anyone")
 }
 
+/// Cycle the incoming-payment accept policy Anyone → Contacts → Ask → Anyone.
+fn cycle_accept_policy(wallet: &Wallet) {
+	use crate::nostr::config::AcceptPolicy;
+	if let Some(s) = wallet.nostr_service() {
+		let next = match s.config.read().accept_from() {
+			AcceptPolicy::Everyone => AcceptPolicy::Contacts,
+			AcceptPolicy::Contacts => AcceptPolicy::Ask,
+			AcceptPolicy::Ask => AcceptPolicy::Everyone,
+		};
+		s.config.write().set_accept_from(next);
+	}
+}
+
 fn relay_summary(wallet: &Wallet) -> String {
 	wallet
 		.nostr_service()