fix(dashboard): preserve registered room aliases

Stop overwriting the user-registered group/room name with the live Discord
channel name during channel-meta refresh; keep the alias and log the
divergence at debug instead.

Co-Authored-By: Claude Opus 4 <noreply@anthropic.com>

src/unified-dashboard.ts

@@ -51,7 +51,7 @@ import {
   mergeClaudeDashboardAccounts,
   type UsageRow,
 } from './dashboard-usage-rows.js';
-import { getAllChats, getAllTasks, updateRegisteredGroupName } from './db.js';
+import { getAllChats, getAllTasks } from './db.js';
 import type { GroupQueue } from './group-queue.js';
 import { logger } from './logger.js';
 import { isWatchCiTask } from './task-watch-status.js';
@@ -208,12 +208,10 @@ async function refreshChannelMeta(
       if (!meta.name) continue;
       const group = opts.roomBindings()[jid];
       if (!group || group.name === meta.name) continue;
-      logger.info(
+      logger.debug(
         { jid, oldName: group.name, newName: meta.name },
-        'Syncing group name to Discord channel name',
+        'Keeping registered group name distinct from Discord channel name',
       );
-      updateRegisteredGroupName(jid, meta.name);
-      opts.onGroupNameSynced?.(jid, meta.name);
     }
   } catch (err) {
     logger.debug({ err }, 'Failed to refresh channel metadata');