Fix ESLint configuration and resolve all linting issues

- Rename eslint.config.js to eslint.config.mjs to support ES modules
- Remove unused parameters from interface implementations
- Fix refs access during render in WorkflowStepper by removing redundant check
- Wrap colorBlocks computation in useMemo to fix exhaustive-deps warning

All linting errors and warnings are now resolved.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

src/components/ProgressMonitor.tsx

@@ -1,4 +1,4 @@
-import { useRef, useEffect, useState } from "react";
+import { useRef, useEffect, useState, useMemo } from "react";
 import {
   CheckCircleIcon,
   ArrowRightIcon,
@@ -58,8 +58,9 @@ export function ProgressMonitor({
     : 0;
 
   // Calculate color block information from pesData
-  const colorBlocks = pesData
-    ? (() => {
+  const colorBlocks = useMemo(() => {
+    if (!pesData) return [];
+
     const blocks: Array<{
       colorIndex: number;
       threadHex: string;
@@ -103,8 +104,7 @@ export function ProgressMonitor({
     }
 
     return blocks;
-      })()
-    : [];
+  }, [pesData]);
 
   // Determine current color block based on current stitch
   const currentStitch = sewingProgress?.currentStitch || 0;

src/components/WorkflowStepper.tsx

@@ -375,7 +375,7 @@ export function WorkflowStepper({
       </div>
 
       {/* Popover */}
-      {showPopover && popoverStep !== null && stepRefs.current[popoverStep] && (
+      {showPopover && popoverStep !== null && (
         <div
           ref={popoverRef}
           className="absolute top-full mt-4 left-1/2 transform -translate-x-1/2 w-full max-w-xl z-50 animate-fadeIn"

src/platform/browser/BrowserFileService.ts

@@ -23,7 +23,7 @@ export class BrowserFileService implements IFileService {
     });
   }
 
-  async saveFileDialog(_data: Uint8Array, _defaultName: string): Promise<void> {
+  async saveFileDialog(): Promise<void> {
     // No-op in browser - could implement download if needed in the future
     console.warn('saveFileDialog not implemented in browser');
   }

src/platform/electron/ElectronFileService.ts

@@ -4,7 +4,7 @@ import type { IFileService } from '../interfaces/IFileService';
  * Electron implementation of file service using native dialogs via IPC
  */
 export class ElectronFileService implements IFileService {
-  async openFileDialog(_options: { accept: string }): Promise<File | null> {
+  async openFileDialog(): Promise<File | null> {
     if (!window.electronAPI) {
       throw new Error('Electron API not available');
     }

src/platform/electron/ElectronStorageService.ts

@@ -68,7 +68,7 @@ export class ElectronStorageService implements IStorageService {
     }
   }
 
-  async hasPattern(_uuid: string): Promise<boolean> {
+  async hasPattern(): Promise<boolean> {
     // Since this is async in Electron, we can't truly implement this synchronously
     // Returning false as a safe default
     console.warn('[ElectronStorage] hasPattern called synchronously, returning false');