feat: add "Retry All Errors" batch reanalyze button

Backend:
- POST /api/messages/reanalyze-batch — bulk reset error messages to pending
- messages.repository.reanalyzeErrorBatch() — scoped by guildId/channelId/messageIds
- messages.service.reanalyzeErrorBatch() — validation layer

Frontend:
- reanalyzeErrorBatch() API client function
- useMessages.reanalyzeAllErrors() — optimistic state + batch call
- MessagesPanel: destructive button visible when error count > 0
- Shows confirmation text with queued count

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

services/frontend/src/App.tsx

@@ -207,6 +207,7 @@ export default function App() {
           guildName={monitorGuildName}
           messages={messages.messages}
           onReanalyze={messages.reanalyze}
+          onReanalyzeAllErrors={messages.reanalyzeAllErrors}
           onLoadMore={messages.loadMore}
           hasMore={messages.hasMore}
           loadingMore={messages.loadingMore}

services/frontend/src/features/messages/hooks/useMessages.ts

@@ -1,6 +1,6 @@
 import { useCallback, useRef, useState } from "react";
 import type { MessageRecord } from "../../../shared/api/client";
-import { listMessages, reanalyzeMessage } from "../../../shared/api/client";
+import { listMessages, reanalyzeErrorBatch, reanalyzeMessage } from "../../../shared/api/client";
 
 const PAGE_SIZE = 100;
 
@@ -91,6 +91,29 @@ export function useMessages() {
     await reanalyzeMessage(id);
   }, []);
 
+  const reanalyzeAllErrors = useCallback(
+    async (): Promise<number> => {
+      // Optimistically mark all error messages as pending
+      setMessages((prev) =>
+        prev.map((message) =>
+          message.ai_status === "error"
+            ? {
+                ...message,
+                ai_status: "pending" as const,
+                ai_error: null,
+                ai_analysis: null,
+              }
+            : message,
+        ),
+      );
+      const { count } = await reanalyzeErrorBatch({
+        guildId: currentGuild.current ?? undefined,
+      });
+      return count;
+    },
+    [],
+  );
+
   return {
     messages,
     setMessages,
@@ -99,6 +122,7 @@ export function useMessages() {
     error,
     fetchMessages,
     reanalyze,
+    reanalyzeAllErrors,
     loadMore,
     hasMore,
   };

services/frontend/src/features/messages/index.tsx

@@ -1,4 +1,4 @@
-import { Filter, Search, X } from "lucide-react";
+import { Filter, RotateCw, Search, X } from "lucide-react";
 import { useMemo, useState } from "react";
 import type { MessageRecord } from "../../shared/api/client";
 import {
@@ -21,6 +21,7 @@ interface MessagesPanelProps {
   guildName: string | null;
   messages: MessageRecord[];
   onReanalyze: (id: string) => Promise<void>;
+  onReanalyzeAllErrors?: () => Promise<number>;
   onLoadMore?: () => void;
   hasMore?: boolean;
   loadingMore?: boolean;
@@ -32,6 +33,7 @@ export function MessagesPanel({
   guildName,
   messages,
   onReanalyze,
+  onReanalyzeAllErrors,
   onLoadMore,
   hasMore,
   loadingMore,
@@ -42,6 +44,8 @@ export function MessagesPanel({
   const [showSearch, setShowSearch] = useState(false);
   const [aiFilter, setAiFilter] = useState<AiFilter>("all");
   const [viewTab, setViewTab] = useState<"all" | "images">("all");
+  const [retryingAll, setRetryingAll] = useState(false);
+  const [retriedCount, setRetriedCount] = useState<number | null>(null);
 
   const handleSearch = async () => {
     if (!searchQuery.trim()) {
@@ -187,6 +191,36 @@ export function MessagesPanel({
             <X className="mr-1 h-3 w-3" /> Clear
           </Button>
         )}
+        {stats.error > 0 && onReanalyzeAllErrors && (
+          <Button
+            variant="destructive"
+            size="sm"
+            disabled={retryingAll}
+            onClick={async () => {
+              setRetryingAll(true);
+              setRetriedCount(null);
+              try {
+                const count = await onReanalyzeAllErrors();
+                setRetriedCount(count);
+              } finally {
+                setRetryingAll(false);
+              }
+            }}
+          >
+            <RotateCw
+              className={`mr-1.5 h-3.5 w-3.5 ${retryingAll ? "animate-spin" : ""}`}
+            />
+            {retryingAll
+              ? "Retrying..."
+              : `Retry All Errors (${stats.error})`}
+          </Button>
+        )}
+        {retriedCount !== null && (
+          <span className="text-xs text-green-400">
+            {retriedCount} message{retriedCount !== 1 ? "s" : ""} queued for
+            re-analysis
+          </span>
+        )}
         <div className="ml-auto flex items-center gap-1.5">
           <Filter className="h-4 w-4 text-muted-foreground" />
           {(

services/frontend/src/shared/api/client.ts

@@ -167,6 +167,17 @@ export function reanalyzeMessage(id: string): Promise<void> {
   return request<void>(`/api/messages/${id}/reanalyze`, { method: "POST" });
 }
 
+export function reanalyzeErrorBatch(opts: {
+  guildId?: string;
+  channelId?: string;
+  messageIds?: string[];
+}): Promise<{ ok: boolean; count: number }> {
+  return request<{ ok: boolean; count: number }>(
+    "/api/messages/reanalyze-batch",
+    { method: "POST", body: JSON.stringify(opts) },
+  );
+}
+
 export function moderateMessage(
   id: string,
   actionType: string,