Upgrade Electron 9→37 and implement IPC architecture

[Copilot]

Modernizes the application from Electron 9 (Node 12) to Electron 37 (Node 22), removing Python 2 dependency and enabling Apple Silicon builds. Refactors renderer-process operations to main process via IPC handlers.

Core Upgrades

• Electron 9.4.4 → 37.0.0
• Node.js 12 → 22 (bundled)
• serialport 9.0.7 → 13.0.0 (required for Node 22)
• Dependencies: electron-log, electron-settings, exceljs, johnny-five updated to compatible versions

Architecture Changes

IPC Layer (preload.js)

New preload script exposes secure APIs via window.electronAPI:

• File operations (async): read/write/delete/list
• Configuration management (nconf-backed)
• Race data storage (electron-settings-backed)
• Hardware I/O: Johnny-Five board, sensors, LEDs, buzzer
• System dialogs and shell operations

Backend Migration (window.js)

Moved 1000+ LOC from renderer to main process:

• All ipcMain.handle() implementations for file system, configuration, storage
• Hardware initialization and I/O operations
• Dialog and window management
• Global state management for board/sensors/LEDs

Renderer Refactoring

• js/main.js: Removed electron.remote, converted to IPC calls and async/await
• js/storage.js: Complete rewrite with async IPC + in-memory cache for backward compatibility
• js/configuration.js: Async IPC-based config operations
• js/client.js, js/export.js, js/ui.js: Updated to async patterns

// Before
const { app } = require('electron').remote;
const racePath = path.join(app.getPath('userData'), 'races');
fs.mkdirSync(racePath);

// After
const racePath = await window.electronAPI.getAppPath('userData');
await window.electronAPI.ensureDir(path.join(racePath, 'races'));

Trade-offs

• Drops Windows 7 support (Windows 10+ required)
• DevTools enabled during transition period
• Context isolation prepared but disabled (contextIsolation: false) for compatibility—hardware operations accessible via window.nodeRequire

Build Changes

• Updated electron-rebuild scripts for native module compilation
• Added serialport override in package.json for dependency resolution
• ESLint rules tightened for async/await patterns

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