fix(channels): treat channel task-detail route as task-detail view

deriveFromMatches only mapped /code/tasks/$taskId to "task-detail", so
archiving a task while viewing it at /website/$channelId/tasks/$taskId
left the stale detail in the main pane — navigateAwayFromTaskIfActive
never fired. Map the channels-space task route to the same view.

Generated-By: PostHog Code
Task-Id: b3d24fd9-abfb-42b8-9efb-f83760f0d3f1

Author: raquelmsmith

packages/ui/src/router/useAppView.ts

@@ -40,7 +40,11 @@ function deriveFromMatches(matches: Match[]): AppView {
   if (!last) return { type: "task-input" };
 
   switch (last.routeId) {
-    case "/code/tasks/$taskId": {
+    // Both the /code task detail and the channels-space task detail render the
+    // same task-detail view, so consumers (active-state highlighting, archive's
+    // navigate-away-if-active check) treat them identically.
+    case "/code/tasks/$taskId":
+    case "/website/$channelId/tasks/$taskId": {
       const taskId = last.params.taskId;
       if (!taskId) return { type: "task-input" };
       // Intentionally no `data` snapshot: consumers read live task state via