fix(feed): a channel filter's chips name their channels from the first paint

After a reload the chips (filter panel and the row above the feed) read as
raw UC… ids until the subscription list landed. The names seen last time
are now kept per account (useChannelNames) and name the chips at once; the
list then replaces the copy, so a renamed or dropped channel heals. A
channel never named on this browser draws a placeholder bone while the
list loads; a failed list still falls back to the id.

frontend/src/lib/storage.ts

@@ -41,6 +41,9 @@ export const LS = {
   channelCardSize: "siftlode.channelCardSize",
   channelDiscoveryCardSize: "siftlode.channelDiscoveryCardSize",
   channelsTable: "siftlode.channelsTable",
+  // Channel id → name as last seen (useChannelNames): names a channel filter's chips after a reload,
+  // before the subscription list has landed. A cache, rewritten from the list on every load.
+  channelNames: "siftlode.channelNames",
   channelDiscoveryTable: "siftlode.channelDiscoveryTable",
   // A page's sub-tab: sessionStorage, per browser tab (useTabPersistedState), like adminUsersTab and
   // statsTab below.