fix: update typescript-eslint for ESLint 10 compatibility

ESLint 10 removed context.parserOptions, breaking typescript-eslint
8.54.0's no-deprecated rule. Updated to 8.56.1 and fixed new
no-useless-assignment and preserve-caught-error violations.

Author: fazxes

agent-bridge/src/agent/utils/content.ts

@@ -80,7 +80,7 @@ export function buildContentBlocks(
       });
     } else if (attachment.type === 'text') {
       // Text content with metadata
-      let textContent = '';
+      let textContent: string;
 
       if (
         attachment.filePath !== undefined &&

apps/Canvas-UI-Builder/src/components/layout/resize-handles/LeftResizeHandle.tsx

@@ -47,7 +47,7 @@ export const LeftResizeHandle: FC = () => {
       if (isCollapsed) return;
 
       const step = e.shiftKey ? KEYBOARD_STEP_LARGE : KEYBOARD_STEP;
-      let newWidth = leftSidebarWidth;
+      let newWidth: number;
 
       if (e.key === 'ArrowLeft') {
         newWidth = Math.max(PANEL_SIZES.sidebar.minUsable, leftSidebarWidth - step);

apps/Canvas-UI-Builder/src/components/layout/resize-handles/RightResizeHandle.tsx

@@ -47,7 +47,7 @@ export const RightResizeHandle: FC = () => {
       if (isCollapsed) return;
 
       const step = e.shiftKey ? KEYBOARD_STEP_LARGE : KEYBOARD_STEP;
-      let newWidth = canvasRightSidebarWidth;
+      let newWidth: number;
 
       // Inverted: ArrowLeft expands, ArrowRight collapses
       if (e.key === 'ArrowLeft') {

apps/agent/src/__tests__/integration/chat/rewind-e2e.test.ts

@@ -444,7 +444,7 @@ describe('Single Rewind E2E', () => {
       'assistant',
       'Let me explain...',
       displayedMessages,
-      ts++
+      ts
     );
     displayedMessages.push(asst4);
     expect(asst4.parentUuid).toBe('user-4'); // Normal chain continuation
@@ -491,7 +491,7 @@ describe('Single Rewind E2E', () => {
     expect(result.forkPointSet?.messageId).toBe('u1');
 
     // New message after rewind branches from user1
-    const user3 = createMessage(SESSION_ID, 'u3', 'user', 'Try again', result.resultMessages, ts++);
+    const user3 = createMessage(SESSION_ID, 'u3', 'user', 'Try again', result.resultMessages, ts);
     expect(user3.parentUuid).toBe('u1');
   });
 
@@ -850,7 +850,7 @@ describe('Multi-Rewind E2E', () => {
     // KEY: u5 forks from sdk-a1 again (third branch from the same point)
     expect(u5.parentUuid).toBe('sdk-a1');
 
-    const a5 = createMessage(SESSION_A, 'a5', 'assistant', 'OK third try', displayed2, ts++);
+    const a5 = createMessage(SESSION_A, 'a5', 'assistant', 'OK third try', displayed2, ts);
     displayed2.push(a5);
 
     // ============================================================
@@ -946,7 +946,7 @@ describe('Multi-Rewind E2E', () => {
 
     const r2 = processConversationRewound(rewind2Event);
     const b2 = [...r2.resultMessages];
-    const u5 = createMessage(SESSION_ID, 'u5', 'user', 'Branch from a1', b2, ts++);
+    const u5 = createMessage(SESSION_ID, 'u5', 'user', 'Branch from a1', b2, ts);
     b2.push(u5);
     expect(u5.parentUuid).toBe('a1');
 

apps/agent/src/__tests__/integration/chat/rewind-flow.test.ts

@@ -219,7 +219,7 @@ describe('Full Rewind Flow Integration', () => {
         'assistant',
         'Let me explain the concept...',
         messages,
-        timestamp++
+        timestamp
       );
       messages.push(resp3);
 
@@ -358,7 +358,7 @@ describe('Full Rewind Flow Integration', () => {
         'assistant',
         'Reply 4',
         messages,
-        timestamp++
+        timestamp
       );
       messages.push(resp4);
 
@@ -404,7 +404,7 @@ describe('Full Rewind Flow Integration', () => {
         'assistant',
         'Reply 2',
         messages,
-        timestamp++
+        timestamp
       );
       messages.push(resp2);
       expect(resp2.parentUuid).toBe('msg-2'); // Normal, not from fork point
@@ -420,7 +420,7 @@ describe('Full Rewind Flow Integration', () => {
       );
 
       // No fork point set - should use last message
-      const msg2 = createMessage(SESSION_ID, 'msg-2', 'user', 'Second', messages, timestamp++);
+      const msg2 = createMessage(SESSION_ID, 'msg-2', 'user', 'Second', messages, timestamp);
       messages.push(msg2);
 
       expect(msg2.parentUuid).toBe('resp-1');
@@ -465,7 +465,7 @@ describe('Full Rewind Flow Integration', () => {
         createMessage(SESSION_ID, 'msg-4', 'user', 'Branch msg', messages, timestamp++)
       );
       messages.push(
-        createMessage(SESSION_ID, 'resp-4', 'assistant', 'Branch resp', messages, timestamp++)
+        createMessage(SESSION_ID, 'resp-4', 'assistant', 'Branch resp', messages, timestamp)
       );
 
       // Active chain should be: msg1 -> resp1 -> msg2 -> resp2 -> msg4 -> resp4

apps/agent/src/components/git/source-control/hooks/use-source-control.ts

@@ -530,7 +530,7 @@ export function useSourceControl(isVisible = true): UseSourceControlReturn {
 
         const display = toUserGitError(err);
         toast.error('Create branch failed', { description: display });
-        throw new Error(display);
+        throw new Error(display, { cause: err });
       } finally {
         setIsCheckingOut(false);
         operationInProgress.current = false;

apps/agent/src/components/layout/resize-handle.tsx

@@ -129,7 +129,7 @@ export const ResizeHandle: FC<ResizeHandleProps> = ({
       const currentValue = target === 'review' ? reviewPanelWidth : bottomPanelHeight;
       const setValue = target === 'review' ? setReviewPanelWidth : setBottomPanelHeight;
 
-      let newValue = currentValue;
+      let newValue: number;
 
       if (direction === 'vertical') {
         // Vertical handle: Left/Right arrows resize

apps/agent/src/components/layout/sidebar-resize-handle.tsx

@@ -78,7 +78,7 @@ export const SidebarResizeHandle: FC = () => {
       if (isCollapsed) return; // Can't resize when collapsed
 
       const step = e.shiftKey ? KEYBOARD_STEP_LARGE : KEYBOARD_STEP;
-      let newWidth = leftSidebarWidth;
+      let newWidth: number;
 
       if (e.key === 'ArrowLeft') {
         newWidth = Math.max(PANEL_SIZES.sidebar.minUsable, leftSidebarWidth - step);

apps/agent/src/components/sidebar/WorktreeItem.tsx

@@ -237,7 +237,7 @@ export const WorktreeItem: FC<WorktreeItemProps> = ({
           error: message,
         });
         toast.error('Create branch failed', { description: displayMessage });
-        throw new Error(displayMessage);
+        throw new Error(displayMessage, { cause: err });
       } finally {
         setIsCheckingOut(false);
       }