feat(ui): add dismiss buttons to inbox errors and failures

Failed runs, alerts, and stale work items can now be dismissed via an
X button that appears on hover. Dismissed items are stored in
localStorage and filtered from the inbox view and item count.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

ui/src/pages/Inbox.tsx

@@ -1,4 +1,4 @@
-import { useEffect, useMemo, useState } from "react";
+import { useCallback, useEffect, useMemo, useState } from "react";
 import { Link, useLocation, useNavigate } from "@/lib/router";
 import { useQuery, useMutation, useQueryClient } from "@tanstack/react-query";
 import { approvalsApi } from "../api/approvals";
@@ -34,6 +34,7 @@ import {
   Clock,
   ArrowUpRight,
   XCircle,
+  X,
   UserCheck,
   RotateCcw,
 } from "lucide-react";
@@ -63,6 +64,36 @@ type SectionKey =
   | "alerts"
   | "stale_work";
 
+const DISMISSED_KEY = "paperclip:inbox:dismissed";
+
+function loadDismissed(): Set<string> {
+  try {
+    const raw = localStorage.getItem(DISMISSED_KEY);
+    return raw ? new Set(JSON.parse(raw)) : new Set();
+  } catch {
+    return new Set();
+  }
+}
+
+function saveDismissed(ids: Set<string>) {
+  localStorage.setItem(DISMISSED_KEY, JSON.stringify([...ids]));
+}
+
+function useDismissedItems() {
+  const [dismissed, setDismissed] = useState<Set<string>>(loadDismissed);
+
+  const dismiss = useCallback((id: string) => {
+    setDismissed((prev) => {
+      const next = new Set(prev);
+      next.add(id);
+      saveDismissed(next);
+      return next;
+    });
+  }, []);
+
+  return { dismissed, dismiss };
+}
+
 const RUN_SOURCE_LABELS: Record<string, string> = {
   timer: "Scheduled",
   assignment: "Assignment",
@@ -123,10 +154,12 @@ function FailedRunCard({
   run,
   issueById,
   agentName: linkedAgentName,
+  onDismiss,
 }: {
   run: HeartbeatRun;
   issueById: Map<string, Issue>;
   agentName: string | null;
+  onDismiss: () => void;
 }) {
   const queryClient = useQueryClient();
   const navigate = useNavigate();
@@ -165,6 +198,14 @@ function FailedRunCard({
   return (
     <div className="group relative overflow-hidden rounded-xl border border-red-500/30 bg-gradient-to-br from-red-500/10 via-card to-card p-4">
       <div className="absolute right-0 top-0 h-24 w-24 rounded-full bg-red-500/10 blur-2xl" />
+      <button
+        type="button"
+        onClick={onDismiss}
+        className="absolute right-2 top-2 z-10 rounded-md p-1 text-muted-foreground opacity-0 transition-opacity hover:bg-accent hover:text-foreground group-hover:opacity-100"
+        aria-label="Dismiss"
+      >
+        <X className="h-4 w-4" />
+      </button>
       <div className="relative space-y-3">
         {issue ? (
           <Link
@@ -253,6 +294,7 @@ export function Inbox() {
   const [actionError, setActionError] = useState<string | null>(null);
   const [allCategoryFilter, setAllCategoryFilter] = useState<InboxCategoryFilter>("everything");
   const [allApprovalFilter, setAllApprovalFilter] = useState<InboxApprovalFilter>("all");
+  const { dismissed, dismiss } = useDismissedItems();
 
   const pathSegment = location.pathname.split("/").pop() ?? "new";
   const tab: InboxTab = pathSegment === "all" ? "all" : "new";
@@ -326,7 +368,10 @@ export function Inbox() {
     enabled: !!selectedCompanyId,
   });
 
-  const staleIssues = issues ? getStaleIssues(issues) : [];
+  const staleIssues = useMemo(
+    () => (issues ? getStaleIssues(issues) : []).filter((i) => !dismissed.has(`stale:${i.id}`)),
+    [issues, dismissed],
+  );
   const assignedToMeIssues = useMemo(
     () =>
       [...assignedToMeIssuesRaw].sort(
@@ -348,8 +393,8 @@ export function Inbox() {
   }, [issues]);
 
   const failedRuns = useMemo(
-    () => getLatestFailedRunsByAgent(heartbeatRuns ?? []),
-    [heartbeatRuns],
+    () => getLatestFailedRunsByAgent(heartbeatRuns ?? []).filter((r) => !dismissed.has(`run:${r.id}`)),
+    [heartbeatRuns, dismissed],
   );
 
   const allApprovals = useMemo(
@@ -435,11 +480,12 @@ export function Inbox() {
   }
 
   const hasRunFailures = failedRuns.length > 0;
-  const showAggregateAgentError = !!dashboard && dashboard.agents.error > 0 && !hasRunFailures;
+  const showAggregateAgentError = !!dashboard && dashboard.agents.error > 0 && !hasRunFailures && !dismissed.has("alert:agent-errors");
   const showBudgetAlert =
     !!dashboard &&
     dashboard.costs.monthBudgetCents > 0 &&
-    dashboard.costs.monthUtilizationPercent >= 80;
+    dashboard.costs.monthUtilizationPercent >= 80 &&
+    !dismissed.has("alert:budget");
   const hasAlerts = showAggregateAgentError || showBudgetAlert;
   const hasStale = staleIssues.length > 0;
   const hasJoinRequests = joinRequests.length > 0;
@@ -700,6 +746,7 @@ export function Inbox() {
                   run={run}
                   issueById={issueById}
                   agentName={agentName(run.agentId)}
+                  onDismiss={() => dismiss(`run:${run.id}`)}
                 />
               ))}
             </div>
@@ -716,29 +763,49 @@ export function Inbox() {
             </h3>
             <div className="divide-y divide-border border border-border">
               {showAggregateAgentError && (
-                <Link
-                  to="/agents"
-                  className="flex cursor-pointer items-center gap-3 px-4 py-3 transition-colors hover:bg-accent/50 no-underline text-inherit"
-                >
-                  <AlertTriangle className="h-4 w-4 shrink-0 text-red-600 dark:text-red-400" />
-                  <span className="text-sm">
-                    <span className="font-medium">{dashboard!.agents.error}</span>{" "}
-                    {dashboard!.agents.error === 1 ? "agent has" : "agents have"} errors
-                  </span>
-                </Link>
+                <div className="group/alert relative flex items-center gap-3 px-4 py-3 transition-colors hover:bg-accent/50">
+                  <Link
+                    to="/agents"
+                    className="flex flex-1 cursor-pointer items-center gap-3 no-underline text-inherit"
+                  >
+                    <AlertTriangle className="h-4 w-4 shrink-0 text-red-600 dark:text-red-400" />
+                    <span className="text-sm">
+                      <span className="font-medium">{dashboard!.agents.error}</span>{" "}
+                      {dashboard!.agents.error === 1 ? "agent has" : "agents have"} errors
+                    </span>
+                  </Link>
+                  <button
+                    type="button"
+                    onClick={() => dismiss("alert:agent-errors")}
+                    className="rounded-md p-1 text-muted-foreground opacity-0 transition-opacity hover:bg-accent hover:text-foreground group-hover/alert:opacity-100"
+                    aria-label="Dismiss"
+                  >
+                    <X className="h-3.5 w-3.5" />
+                  </button>
+                </div>
               )}
               {showBudgetAlert && (
-                <Link
-                  to="/costs"
-                  className="flex cursor-pointer items-center gap-3 px-4 py-3 transition-colors hover:bg-accent/50 no-underline text-inherit"
-                >
-                  <AlertTriangle className="h-4 w-4 shrink-0 text-yellow-400" />
-                  <span className="text-sm">
-                    Budget at{" "}
-                    <span className="font-medium">{dashboard!.costs.monthUtilizationPercent}%</span>{" "}
-                    utilization this month
-                  </span>
-                </Link>
+                <div className="group/alert relative flex items-center gap-3 px-4 py-3 transition-colors hover:bg-accent/50">
+                  <Link
+                    to="/costs"
+                    className="flex flex-1 cursor-pointer items-center gap-3 no-underline text-inherit"
+                  >
+                    <AlertTriangle className="h-4 w-4 shrink-0 text-yellow-400" />
+                    <span className="text-sm">
+                      Budget at{" "}
+                      <span className="font-medium">{dashboard!.costs.monthUtilizationPercent}%</span>{" "}
+                      utilization this month
+                    </span>
+                  </Link>
+                  <button
+                    type="button"
+                    onClick={() => dismiss("alert:budget")}
+                    className="rounded-md p-1 text-muted-foreground opacity-0 transition-opacity hover:bg-accent hover:text-foreground group-hover/alert:opacity-100"
+                    aria-label="Dismiss"
+                  >
+                    <X className="h-3.5 w-3.5" />
+                  </button>
+                </div>
               )}
             </div>
           </div>
@@ -754,33 +821,45 @@ export function Inbox() {
             </h3>
             <div className="divide-y divide-border border border-border">
               {staleIssues.map((issue) => (
-                <Link
+                <div
                   key={issue.id}
-                  to={`/issues/${issue.identifier ?? issue.id}`}
-                  className="flex cursor-pointer items-center gap-3 px-4 py-3 transition-colors hover:bg-accent/50 no-underline text-inherit"
+                  className="group/stale relative flex items-center gap-3 px-4 py-3 transition-colors hover:bg-accent/50"
                 >
-                  <Clock className="h-4 w-4 shrink-0 text-muted-foreground" />
-                  <PriorityIcon priority={issue.priority} />
-                  <StatusIcon status={issue.status} />
-                  <span className="text-xs font-mono text-muted-foreground">
-                    {issue.identifier ?? issue.id.slice(0, 8)}
-                  </span>
-                  <span className="flex-1 truncate text-sm">{issue.title}</span>
-                  {issue.assigneeAgentId &&
-                    (() => {
-                      const name = agentName(issue.assigneeAgentId);
-                      return name ? (
-                        <Identity name={name} size="sm" />
-                      ) : (
-                        <span className="font-mono text-xs text-muted-foreground">
-                          {issue.assigneeAgentId.slice(0, 8)}
-                        </span>
-                      );
-                    })()}
-                  <span className="shrink-0 text-xs text-muted-foreground">
-                    updated {timeAgo(issue.updatedAt)}
-                  </span>
-                </Link>
+                  <Link
+                    to={`/issues/${issue.identifier ?? issue.id}`}
+                    className="flex flex-1 cursor-pointer items-center gap-3 no-underline text-inherit"
+                  >
+                    <Clock className="h-4 w-4 shrink-0 text-muted-foreground" />
+                    <PriorityIcon priority={issue.priority} />
+                    <StatusIcon status={issue.status} />
+                    <span className="text-xs font-mono text-muted-foreground">
+                      {issue.identifier ?? issue.id.slice(0, 8)}
+                    </span>
+                    <span className="flex-1 truncate text-sm">{issue.title}</span>
+                    {issue.assigneeAgentId &&
+                      (() => {
+                        const name = agentName(issue.assigneeAgentId);
+                        return name ? (
+                          <Identity name={name} size="sm" />
+                        ) : (
+                          <span className="font-mono text-xs text-muted-foreground">
+                            {issue.assigneeAgentId.slice(0, 8)}
+                          </span>
+                        );
+                      })()}
+                    <span className="shrink-0 text-xs text-muted-foreground">
+                      updated {timeAgo(issue.updatedAt)}
+                    </span>
+                  </Link>
+                  <button
+                    type="button"
+                    onClick={() => dismiss(`stale:${issue.id}`)}
+                    className="rounded-md p-1 text-muted-foreground opacity-0 transition-opacity hover:bg-accent hover:text-foreground group-hover/stale:opacity-100"
+                    aria-label="Dismiss"
+                  >
+                    <X className="h-3.5 w-3.5" />
+                  </button>
+                </div>
               ))}
             </div>
           </div>