Use better behavior on disconnected radio and allow deeplinking into settings. Closes #66.

frontend/src/utils/urlHash.ts

@@ -1,6 +1,7 @@
 import type { Channel, Contact, Conversation } from '../types';
 import { findPublicChannel, PUBLIC_CHANNEL_NAME } from './publicChannel';
 import { getContactDisplayName } from './pubkey';
+import type { SettingsSection } from '../components/settings/settingsConstants';
 
 interface ParsedHashConversation {
   type: 'channel' | 'contact' | 'raw' | 'map' | 'visualizer' | 'search';
@@ -12,6 +13,15 @@ interface ParsedHashConversation {
   mapFocusKey?: string;
 }
 
+const SETTINGS_SECTIONS: SettingsSection[] = [
+  'radio',
+  'local',
+  'fanout',
+  'database',
+  'statistics',
+  'about',
+];
+
 // Parse URL hash to get conversation
 // (e.g., #channel/ABCDEF0123456789ABCDEF0123456789 or #contact/<64-char-pubkey>).
 export function parseHashConversation(): ParsedHashConversation | null {
@@ -70,6 +80,20 @@ export function parseHashConversation(): ParsedHashConversation | null {
   };
 }
 
+export function parseHashSettingsSection(): SettingsSection | null {
+  const hash = window.location.hash.slice(1);
+  if (!hash.startsWith('settings/')) {
+    return null;
+  }
+
+  const section = decodeURIComponent(hash.slice('settings/'.length)) as SettingsSection;
+  return SETTINGS_SECTIONS.includes(section) ? section : null;
+}
+
+export function getSettingsHash(section: SettingsSection): string {
+  return `#settings/${encodeURIComponent(section)}`;
+}
+
 export function resolveChannelFromHashToken(token: string, channels: Channel[]): Channel | null {
   const normalizedToken = token.trim();
   if (!normalizedToken) return null;
@@ -141,3 +165,10 @@ export function updateUrlHash(conv: Conversation | null): void {
     window.history.replaceState(null, '', newHash || window.location.pathname);
   }
 }
+
+export function updateSettingsHash(section: SettingsSection): void {
+  const newHash = getSettingsHash(section);
+  if (newHash !== window.location.hash) {
+    window.history.replaceState(null, '', newHash);
+  }
+}