Polish off all our gross edges around frontend/backend Public name management

frontend/src/utils/publicChannel.ts

@@ -0,0 +1,12 @@
+import type { Channel } from '../types';
+
+export const PUBLIC_CHANNEL_KEY = '8B3387E9C5CDEA6AC9E5EDBAA115CD72';
+export const PUBLIC_CHANNEL_NAME = 'Public';
+
+export function isPublicChannelKey(key: string): boolean {
+  return key.toUpperCase() === PUBLIC_CHANNEL_KEY;
+}
+
+export function findPublicChannel(channels: Channel[]): Channel | undefined {
+  return channels.find((channel) => isPublicChannelKey(channel.key));
+}

frontend/src/utils/urlHash.ts

@@ -1,4 +1,5 @@
 import type { Channel, Contact, Conversation } from '../types';
+import { findPublicChannel, PUBLIC_CHANNEL_NAME } from './publicChannel';
 import { getContactDisplayName } from './pubkey';
 
 interface ParsedHashConversation {
@@ -77,6 +78,13 @@ export function resolveChannelFromHashToken(token: string, channels: Channel[]):
   const byKey = channels.find((c) => c.key.toLowerCase() === normalizedToken.toLowerCase());
   if (byKey) return byKey;
 
+  // Legacy Public hashes should resolve to the canonical Public key, not any
+  // arbitrary row that happens to share the display name.
+  if (normalizedToken.toLowerCase() === PUBLIC_CHANNEL_NAME.toLowerCase()) {
+    const publicChannel = findPublicChannel(channels);
+    if (publicChannel) return publicChannel;
+  }
+
   // Backward compatibility for legacy name-based hashes.
   return (
     channels.find((c) => c.name === normalizedToken || c.name === `#${normalizedToken}`) || null