fix(channels): drop a stale column filter when sent to "without full history"

A focus-channel deep-link sets (and persists) the channel-name column filter
via the DataTable's externalFilter. That persisted value then survived into
unrelated visits: clicking the header's "N without full history" link landed
on the right tab with the right status chip, but a leftover name filter (e.g.
a channel focused in a past session) hid every row — "No channels".

Add a resetFiltersToken to DataTable that clears its column filters when it
advances, and bump it from the header intent. The token's ref starts at 0 so
the clear fires even when the table remounts on navigation, while a plain
reload (token still 0) keeps the user's persisted filters.

frontend/src/App.tsx

@@ -148,6 +148,9 @@ export default function App() {
     setChannelsViewState(v);
     localStorage.setItem(CHANNELS_VIEW_KEY, v);
   };
+  // Bumped to tell the channel manager to drop a stale column filter when we send the user
+  // there to see a specific set (the header's "without full history" link).
+  const [channelsFilterReset, setChannelsFilterReset] = useState(0);
   // "Focus this channel in the manager": jump to the Channels page and seed its name filter
   // so the channel is isolated. Cleared when leaving the page so it doesn't re-apply later.
   const [focusChannelName, setFocusChannelName] = useState<string | null>(null);
@@ -423,6 +426,7 @@ export default function App() {
           onGoToFullHistory={() => {
             setChannelFilter("needs_full");
             setChannelsView("subscribed"); // the status filter applies to the subscriptions tab
+            setChannelsFilterReset((n) => n + 1); // drop any stale column filter hiding the rows
             setPage("channels");
           }}
         />
@@ -449,6 +453,7 @@ export default function App() {
               setStatusFilter={setChannelFilter}
               view={channelsView}
               setView={setChannelsView}
+              filtersResetToken={channelsFilterReset}
               onOpenWizard={() => setWizardOpen(true)}
               onViewChannel={(id, name) => {
                 setFilters({ ...filters, channelId: id, channelName: name, show: "all" });

frontend/src/components/Channels.tsx

@@ -52,6 +52,7 @@ export default function Channels({
   setStatusFilter,
   view,
   setView,
+  filtersResetToken,
   onOpenWizard,
 }: {
   canWrite: boolean;
@@ -66,6 +67,8 @@ export default function Channels({
   // (the header's "without full history" link, focus-channel) can force it back here.
   view: ChannelsView;
   setView: (v: ChannelsView) => void;
+  // Bumped by the header's "without full history" intent to clear a stale column filter.
+  filtersResetToken: number;
   onOpenWizard: () => void;
 }) {
   const { t } = useTranslation();
@@ -510,6 +513,7 @@ export default function Channels({
           controlsPosition="top"
           controlsLeading={statusChips}
           externalFilter={focusChannelName ? { key: "channel", value: focusChannelName } : null}
+          resetFiltersToken={filtersResetToken}
           rowClassName={(c) => (c.hidden ? "opacity-60" : "")}
           emptyText={t("channels.empty")}
         />

frontend/src/components/DataTable.tsx

@@ -67,6 +67,7 @@ export default function DataTable<T>({
   controlsPosition = "bottom",
   controlsLeading,
   externalFilter,
+  resetFiltersToken,
 }: {
   rows: T[];
   columns: Column<T>[];
@@ -81,6 +82,10 @@ export default function DataTable<T>({
   // Set a column's filter from outside (e.g. "focus this channel" deep-links here). Applied
   // whenever its value changes; the user can still clear it from the header afterwards.
   externalFilter?: { key: string; value: string } | null;
+  // Bump this to clear all column filters — for navigation intents that mean "show me this
+  // set" (e.g. the header's "without full history" link), so a stale persisted filter can't
+  // hide the rows the user was just sent to see.
+  resetFiltersToken?: number;
 }) {
   const { t } = useTranslation();
   const initial = loadPersist(persistKey);
@@ -104,6 +109,18 @@ export default function DataTable<T>({
     // eslint-disable-next-line react-hooks/exhaustive-deps
   }, [externalFilter?.key, externalFilter?.value]);
 
+  // Clear column filters when the reset token advances. The ref starts at 0 (not at the prop)
+  // so a navigation that bumped the token still clears even when it remounts this table fresh
+  // (e.g. arriving from another page); a plain reload keeps the token at 0 and the effect is a
+  // no-op, so the user's persisted filters survive.
+  const resetRef = useRef(0);
+  useEffect(() => {
+    if (resetFiltersToken === undefined || resetFiltersToken === resetRef.current) return;
+    resetRef.current = resetFiltersToken;
+    setFilters({});
+    setPage(0);
+  }, [resetFiltersToken]);
+
   useEffect(() => {
     if (!openFilter) return;
     function onDown(e: MouseEvent) {