fix: handle multi-file tool diffs safely

Split multi-file patches before diff rendering
Fixed hook dependency lint warnings

packages/ui/src/components/chat/ChatInput.tsx

@@ -2341,7 +2341,7 @@ const ChatInputComponent: React.FC<ChatInputProps> = ({ onOpenSettings, scrollTo
                 toast.error(error instanceof Error ? error.message : t('chat.chatInput.toast.clipboardAttachFailed'));
             }
         }
-    }, [addAttachedFile, currentSessionId, newSessionDraftOpen, insertTextAtSelection]);
+    }, [addAttachedFile, currentSessionId, newSessionDraftOpen, insertTextAtSelection, t]);
 
     const handleFileSelect = (file: { name: string; path: string; relativePath?: string }) => {
 
@@ -2650,7 +2650,7 @@ const ChatInputComponent: React.FC<ChatInputProps> = ({ onOpenSettings, scrollTo
 
         setPendingInputText(mentions.join(' '), 'append-inline');
         toast.success(t('chat.chatInput.toast.addedFileMentions', { count: mentions.length }));
-    }, [normalizeDroppedPath, setPendingInputText, toProjectRelativeMentionPath]);
+    }, [normalizeDroppedPath, setPendingInputText, t, toProjectRelativeMentionPath]);
 
     const handleDragEnter = (e: React.DragEvent) => {
         if (!hasDraggedFiles(e.dataTransfer)) {
@@ -2897,7 +2897,7 @@ const ChatInputComponent: React.FC<ChatInputProps> = ({ onOpenSettings, scrollTo
             cancelled = true;
             if (unlisten) unlisten();
         };
-    }, [addAttachedFile, normalizeDroppedPath]);
+    }, [addAttachedFile, normalizeDroppedPath, t]);
 
     const fileInputRef = React.useRef<HTMLInputElement>(null);
 
@@ -2912,7 +2912,7 @@ const ChatInputComponent: React.FC<ChatInputProps> = ({ onOpenSettings, scrollTo
                 toast.error(error instanceof Error ? error.message : t('chat.chatInput.toast.attachFileFailed'));
             }
         }
-    }, [addAttachedFile]);
+    }, [addAttachedFile, t]);
 
     const handleVSCodePickFiles = React.useCallback(async () => {
         try {
@@ -2956,7 +2956,7 @@ const ChatInputComponent: React.FC<ChatInputProps> = ({ onOpenSettings, scrollTo
             console.error('VS Code file pick failed', error);
             toast.error(error instanceof Error ? error.message : t('chat.chatInput.toast.vscodePickFailed'));
         }
-    }, [attachFiles]);
+    }, [attachFiles, t]);
 
     const handlePickLocalFiles = React.useCallback(() => {
         if (isVSCodeRuntime()) {
@@ -3268,7 +3268,7 @@ const ChatInputComponent: React.FC<ChatInputProps> = ({ onOpenSettings, scrollTo
         setSessionAutoAccept(permissionScopeSessionId, nextEnabled).catch(() => {
             toast.error(t('chat.chatInput.toast.togglePermissionAutoAcceptFailed'));
         });
-    }, [permissionAutoAcceptEnabled, permissionScopeSessionId, setSessionAutoAccept]);
+    }, [permissionAutoAcceptEnabled, permissionScopeSessionId, setSessionAutoAccept, t]);
 
     React.useEffect(() => {
         const pendingAbortBanner = Boolean(abortPromptSessionId) && abortPromptSessionId === currentSessionId;

packages/ui/src/components/chat/message/MessageBody.tsx

@@ -1010,7 +1010,7 @@ const AssistantMessageBody = React.memo(({
                 setIsSavingPlan(false);
             }
         },
-        [assistantPlanText, currentProjectRef]
+        [assistantPlanText, currentProjectRef, t]
     );
 
     const [isSharing, setIsSharing] = React.useState(false);
@@ -1123,7 +1123,7 @@ const AssistantMessageBody = React.memo(({
                 setIsSharing(false);
             }
         },
-        [messageId, isSharing]
+        [messageId, isSharing, t]
     );
 
     React.useEffect(() => {

packages/ui/src/components/chat/message/TextSelectionMenu.tsx

@@ -534,7 +534,7 @@ export const TextSelectionMenu: React.FC<TextSelectionMenuProps> = ({ containerR
     } finally {
       setIsAddingToNotes(false);
     }
-  }, [currentProjectRef, hideMenu, selectedText]);
+  }, [currentProjectRef, hideMenu, selectedText, t]);
 
   if (!position.show) return null;
 

packages/ui/src/components/chat/message/ToolOutputDialog.tsx

@@ -782,7 +782,7 @@ const MermaidPreviewDialog: React.FC<{
                 setStatus('error');
                 setErrorMessage(error instanceof Error ? error.message : t('chat.toolOutputDialog.mermaid.loadFailed'));
             });
-    }, [decodeDataUrl, normalizeFilePath, popup.mermaid]);
+    }, [decodeDataUrl, normalizeFilePath, popup.mermaid, t]);
 
     React.useEffect(() => {
         if (!popup.open || !popup.mermaid) {

packages/ui/src/components/chat/message/parts/ToolPart.tsx

@@ -1243,6 +1243,56 @@ type DiffPatchEntry = {
     patch: string;
 };
 
+const hasUnifiedDiffHunk = (patch: string): boolean => /^@@\s+-\d+(?:,\d+)?\s+\+\d+(?:,\d+)?\s+@@/m.test(patch);
+
+const getUnifiedDiffPath = (patch: string, fallbackTitle: string): string => {
+    const plusHeader = patch.match(/^\+\+\+\s+(?:[ab]\/(.+)|(.+))$/m);
+    const rawPath = plusHeader?.[1] ?? plusHeader?.[2];
+    if (!rawPath || rawPath === '/dev/null') {
+        return fallbackTitle;
+    }
+    return rawPath;
+};
+
+const splitUnifiedDiffPatch = (patch: string): DiffPatchEntry[] => {
+    const normalized = patch.replace(/\r\n/g, '\n').trim();
+    if (!normalized) {
+        return [];
+    }
+
+    const lines = normalized.split('\n');
+    const starts: number[] = [];
+
+    for (let index = 0; index < lines.length; index += 1) {
+        const line = lines[index] ?? '';
+        const nextLine = lines[index + 1] ?? '';
+        const isUnifiedFileHeader = /^---\s+(?:[ab]\/|\/dev\/null|\/)/.test(line)
+            && /^\+\+\+\s+(?:[ab]\/|\/dev\/null|\/)/.test(nextLine);
+        if (line.startsWith('diff --git ') || line.startsWith('Index: ') || isUnifiedFileHeader) {
+            starts.push(index);
+        }
+    }
+
+    const chunks = starts.length > 0
+        ? starts.map((start, index) => lines.slice(start, starts[index + 1] ?? lines.length).join('\n').trim())
+        : [normalized];
+
+    return chunks
+        .map((chunk, index) => {
+            if (!hasUnifiedDiffHunk(chunk)) {
+                return null;
+            }
+
+            const title = getUnifiedDiffPath(chunk, `Diff ${index + 1}`);
+            return {
+                id: `${title}-${index}`,
+                title,
+                patch: chunk,
+            } satisfies DiffPatchEntry;
+        })
+        .filter((entry): entry is DiffPatchEntry => entry !== null);
+};
+
 const renderPathLikeGitChanges = (path: string, grow = true) => {
     const lastSlash = path.lastIndexOf('/');
     if (lastSlash === -1) {
@@ -1338,7 +1388,7 @@ const getDiffPatchEntries = (
 
             const record = file as { relativePath?: unknown; filePath?: unknown; patch?: unknown; diff?: unknown };
             const patch = getPatchText(record.patch) ?? getPatchText(record.diff) ?? '';
-            if (!patch) {
+            if (!patch || !hasUnifiedDiffHunk(patch)) {
                 return null;
             }
 
@@ -1364,13 +1414,16 @@ const getDiffPatchEntries = (
         return entries;
     }
 
-    return [
-        {
-            id: 'diff-0',
-            title: 'Diff',
-            patch: fallbackDiff,
-        },
-    ];
+    const splitEntries = splitUnifiedDiffPatch(fallbackDiff).map((entry) => ({
+        ...entry,
+        title: getRelativePath(entry.title, currentDirectory),
+    }));
+
+    if (splitEntries.length > 0) {
+        return splitEntries;
+    }
+
+    return [];
 };
 
 const DiffPreview: React.FC<DiffPreviewProps> = React.memo(({ diff, pierreTheme, pierreThemeType, diffViewMode }) => {