fix(activity): use API route metadata for feed links

frontend/src/app/activity/page.tsx

@@ -89,9 +89,11 @@ type FeedItem = {
   actor_role: string | null;
   board_id: string | null;
   board_name: string | null;
+  board_href: string | null;
   task_id: string | null;
   task_title: string | null;
   title: string;
+  context_href: string | null;
 };
 
 type TaskMeta = {
@@ -99,6 +101,10 @@ type TaskMeta = {
   boardId: string | null;
 };
 
+type ActivityRouteParams = Record<string, string>;
+
+const ACTIVITY_FEED_PATH = "/activity";
+
 const TASK_EVENT_TYPES = new Set<TaskEventType>([
   "task.comment",
   "task.created",
@@ -120,6 +126,73 @@ const formatShortTimestamp = (value: string) => {
   });
 };
 
+const normalizeRouteParams = (
+  params: ActivityEventRead["route_params"] | ActivityRouteParams | null | undefined,
+): ActivityRouteParams => {
+  if (!params || typeof params !== "object") return {};
+  return Object.entries(params).reduce<ActivityRouteParams>((acc, [key, value]) => {
+    if (typeof value === "string" && value.length > 0) {
+      acc[key] = value;
+    }
+    return acc;
+  }, {});
+};
+
+const buildRouteHref = (
+  routeName: string | null | undefined,
+  routeParams: ActivityRouteParams,
+  fallback: {
+    eventId: string;
+    eventType: string;
+    createdAt: string;
+    taskId: string | null;
+  },
+): string => {
+  if (routeName === "board.approvals") {
+    const boardId = routeParams.boardId;
+    if (boardId) {
+      return `/boards/${encodeURIComponent(boardId)}/approvals`;
+    }
+  }
+
+  if (routeName === "board") {
+    const boardId = routeParams.boardId;
+    if (boardId) {
+      const params = new URLSearchParams();
+      Object.entries(routeParams).forEach(([key, value]) => {
+        if (key !== "boardId") params.set(key, value);
+      });
+      const query = params.toString();
+      return query
+        ? `/boards/${encodeURIComponent(boardId)}?${query}`
+        : `/boards/${encodeURIComponent(boardId)}`;
+    }
+  }
+
+  const params = new URLSearchParams(
+    Object.keys(routeParams).length > 0
+      ? routeParams
+      : {
+          eventId: fallback.eventId,
+          eventType: fallback.eventType,
+          createdAt: fallback.createdAt,
+        },
+  );
+  if (fallback.taskId && !params.has("taskId")) {
+    params.set("taskId", fallback.taskId);
+  }
+  return `${ACTIVITY_FEED_PATH}?${params.toString()}`;
+};
+
+const buildBoardHref = (
+  routeParams: ActivityRouteParams,
+  boardId: string | null,
+): string | null => {
+  const resolved = routeParams.boardId ?? boardId;
+  if (!resolved) return null;
+  return `/boards/${encodeURIComponent(resolved)}`;
+};
+
 const feedItemElementId = (id: string): string =>
   `activity-item-${id.replace(/[^a-zA-Z0-9_-]/g, "-")}`;
 
@@ -219,11 +292,6 @@ const FeedCard = memo(function FeedCard({
 }) {
   const message = (item.message ?? "").trim();
   const authorAvatar = (item.actor_name[0] ?? "A").toUpperCase();
-  const taskHref =
-    item.board_id && item.task_id
-      ? `/boards/${item.board_id}?taskId=${item.task_id}`
-      : null;
-  const boardHref = item.board_id ? `/boards/${item.board_id}` : null;
 
   return (
     <div
@@ -241,9 +309,9 @@ const FeedCard = memo(function FeedCard({
         </div>
         <div className="min-w-0 flex-1">
           <div className="min-w-0">
-            {taskHref ? (
+            {item.context_href ? (
               <Link
-                href={taskHref}
+                href={item.context_href}
                 className="block text-sm font-semibold leading-snug text-slate-900 transition hover:text-slate-950 hover:underline"
                 title={item.title}
                 style={{
@@ -269,9 +337,9 @@ const FeedCard = memo(function FeedCard({
               >
                 {eventLabel(item.event_type)}
               </span>
-              {boardHref && item.board_name ? (
+              {item.board_href && item.board_name ? (
                 <Link
-                  href={boardHref}
+                  href={item.board_href}
                   className="font-semibold text-slate-700 hover:text-slate-900 hover:underline"
                 >
                   {item.board_name}
@@ -424,12 +492,30 @@ export default function ActivityPage() {
   );
 
   const mapTaskActivity = useCallback(
-    (event: ActivityEventRead): FeedItem | null => {
+    (
+      event: ActivityEventRead,
+      fallbackBoardId: string | null = null,
+    ): FeedItem | null => {
       if (!isTaskEventType(event.event_type)) return null;
       const meta = event.task_id
         ? taskMetaByIdRef.current.get(event.task_id)
         : null;
-      const boardId = meta?.boardId ?? null;
+      const routeName = event.route_name ?? null;
+      const routeParams = normalizeRouteParams(event.route_params);
+      const taskId = event.task_id ?? routeParams.taskId ?? null;
+      const boardId =
+        meta?.boardId ??
+        event.board_id ??
+        routeParams.boardId ??
+        fallbackBoardId ??
+        null;
+      const fallbackRouteParams: ActivityRouteParams = {};
+      if (boardId) fallbackRouteParams.boardId = boardId;
+      if (taskId) fallbackRouteParams.taskId = taskId;
+      const effectiveRouteParams =
+        Object.keys(routeParams).length > 0 ? routeParams : fallbackRouteParams;
+      const effectiveRouteName =
+        routeName ?? (boardId ? "board" : "activity");
       const author = resolveAuthor(event.agent_id, currentUserDisplayName);
       return {
         id: `activity:${event.id}`,
@@ -442,10 +528,17 @@ export default function ActivityPage() {
         actor_role: author.role,
         board_id: boardId,
         board_name: boardNameForId(boardId),
-        task_id: event.task_id ?? null,
+        board_href: buildBoardHref(effectiveRouteParams, boardId),
+        task_id: taskId,
         task_title: meta?.title ?? null,
         title:
-          meta?.title ?? (event.task_id ? "Unknown task" : "Task activity"),
+          meta?.title ?? (taskId ? "Unknown task" : "Task activity"),
+        context_href: buildRouteHref(effectiveRouteName, effectiveRouteParams, {
+          eventId: event.id,
+          eventType: event.event_type,
+          createdAt: event.created_at,
+          taskId,
+        }),
       };
     },
     [boardNameForId, currentUserDisplayName, resolveAuthor],
@@ -457,6 +550,11 @@ export default function ActivityPage() {
         ? taskMetaByIdRef.current.get(comment.task_id)
         : null;
       const boardId = meta?.boardId ?? fallbackBoardId;
+      const taskId = comment.task_id ?? null;
+      const routeParams: ActivityRouteParams = {};
+      if (boardId) routeParams.boardId = boardId;
+      if (taskId) routeParams.taskId = taskId;
+      routeParams.commentId = comment.id;
       const author = resolveAuthor(comment.agent_id, currentUserDisplayName);
       return {
         id: `comment:${comment.id}`,
@@ -469,10 +567,17 @@ export default function ActivityPage() {
         actor_role: author.role,
         board_id: boardId,
         board_name: boardNameForId(boardId),
-        task_id: comment.task_id ?? null,
+        board_href: buildBoardHref(routeParams, boardId),
+        task_id: taskId,
         task_title: meta?.title ?? null,
         title:
-          meta?.title ?? (comment.task_id ? "Unknown task" : "Task activity"),
+          meta?.title ?? (taskId ? "Unknown task" : "Task activity"),
+        context_href: buildRouteHref("board", routeParams, {
+          eventId: comment.id,
+          eventType: "task.comment",
+          createdAt: comment.created_at,
+          taskId,
+        }),
       };
     },
     [boardNameForId, currentUserDisplayName, resolveAuthor],
@@ -525,6 +630,8 @@ export default function ActivityPage() {
       const taskMeta = approval.task_id
         ? taskMetaByIdRef.current.get(approval.task_id)
         : null;
+      const routeParams: ActivityRouteParams = { boardId };
+      const taskId = approval.task_id ?? null;
 
       return {
         id: `approval:${approval.id}:${kind}:${stamp}`,
@@ -537,9 +644,16 @@ export default function ActivityPage() {
         actor_role: author.role,
         board_id: boardId,
         board_name: boardNameForId(boardId),
-        task_id: approval.task_id ?? null,
+        board_href: buildBoardHref(routeParams, boardId),
+        task_id: taskId,
         task_title: taskMeta?.title ?? null,
         title: `Approval · ${action}`,
+        context_href: buildRouteHref("board.approvals", routeParams, {
+          eventId: approval.id,
+          eventType: kind,
+          createdAt: stamp,
+          taskId,
+        }),
       };
     },
     [boardNameForId, currentUserDisplayName, resolveAuthor],
@@ -553,6 +667,7 @@ export default function ActivityPage() {
         currentUserDisplayName,
       );
       const command = content.startsWith("/");
+      const routeParams: ActivityRouteParams = { boardId, panel: "chat" };
       return {
         id: `chat:${memory.id}`,
         created_at: memory.created_at,
@@ -564,9 +679,16 @@ export default function ActivityPage() {
         actor_role: null,
         board_id: boardId,
         board_name: boardNameForId(boardId),
+        board_href: buildBoardHref(routeParams, boardId),
         task_id: null,
         task_title: null,
         title: command ? "Board command" : "Board chat",
+        context_href: buildRouteHref("board", routeParams, {
+          eventId: memory.id,
+          eventType: command ? "board.command" : "board.chat",
+          createdAt: memory.created_at,
+          taskId: null,
+        }),
       };
     },
     [boardNameForId, currentUserDisplayName],
@@ -618,6 +740,10 @@ export default function ActivityPage() {
             : kind === "agent.offline"
               ? `${agent.name} is offline.`
               : `${agent.name} updated (${humanizeStatus(nextStatus)}).`;
+      const boardId = agent.board_id ?? null;
+      const routeParams: ActivityRouteParams = boardId
+        ? { boardId }
+        : {};
 
       return {
         id: `agent:${agent.id}:${isSnapshot ? "snapshot" : kind}:${stamp}`,
@@ -628,11 +754,21 @@ export default function ActivityPage() {
         agent_id: agent.id,
         actor_name: agent.name,
         actor_role: roleFromAgent(agent),
-        board_id: agent.board_id ?? null,
+        board_id: boardId,
-        board_name: boardNameForId(agent.board_id),
+        board_name: boardNameForId(boardId),
+        board_href: buildBoardHref(routeParams, boardId),
         task_id: null,
         task_title: null,
         title: `Agent · ${agent.name}`,
+        context_href:
+          boardId === null
+            ? null
+            : buildRouteHref("board", routeParams, {
+                eventId: agent.id,
+                eventType: kind,
+                createdAt: stamp,
+                taskId: null,
+              }),
       };
     },
     [boardNameForId],
@@ -871,12 +1007,8 @@ export default function ActivityPage() {
                     updateTaskMeta(payload.task, boardId);
                   }
                   if (payload.activity) {
-                    const mapped = mapTaskActivity(payload.activity);
+                    const mapped = mapTaskActivity(payload.activity, boardId);
                     if (mapped) {
-                      if (!mapped.board_id) {
-                        mapped.board_id = boardId;
-                        mapped.board_name = boardNameForId(boardId);
-                      }
                       if (!mapped.task_title && payload.task?.title) {
                         mapped.task_title = payload.task.title;
                         mapped.title = payload.task.title;