feat(update): implement auto-update functionality with electron-updater

- Add AppUpdater module with update lifecycle management
- Create UpdateSettings UI component with progress display
- Add Progress UI component based on Radix UI
- Create update Zustand store for state management
- Register update IPC handlers in main process
- Auto-check for updates on production startup
- Add commit documentation for commits 2-6

build_process/commit_4_provider_configuration.md

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+# Commit 4: Provider Configuration
+
+## Summary
+Implement secure API key storage using Electron's safeStorage API and create a comprehensive provider management UI for configuring AI model providers.
+
+## Changes
+
+### Electron Main Process
+
+#### `electron/utils/secure-storage.ts` (New)
+Secure storage utility using Electron's safeStorage:
+- `isEncryptionAvailable()` - Check if system keychain is available
+- `storeApiKey(providerId, apiKey)` - Encrypt and store API key
+- `getApiKey(providerId)` - Decrypt and retrieve API key
+- `deleteApiKey(providerId)` - Remove stored API key
+- `hasApiKey(providerId)` - Check if key exists
+- `listStoredKeyIds()` - List all stored provider IDs
+
+Provider configuration management:
+- `saveProvider(config)` - Save provider configuration
+- `getProvider(providerId)` - Get single provider
+- `getAllProviders()` - Get all providers
+- `deleteProvider(providerId)` - Delete provider and key
+- `setDefaultProvider(providerId)` - Set default provider
+- `getDefaultProvider()` - Get default provider ID
+- `getProviderWithKeyInfo(providerId)` - Get provider with masked key
+- `getAllProvidersWithKeyInfo()` - Get all providers with key info
+
+Note: Uses dynamic `import('electron-store')` for ESM compatibility.
+
+#### `electron/main/ipc-handlers.ts`
+New `registerProviderHandlers()` function with IPC handlers:
+- `provider:encryptionAvailable`
+- `provider:list` / `provider:get` / `provider:save` / `provider:delete`
+- `provider:setApiKey` / `provider:deleteApiKey` / `provider:hasApiKey` / `provider:getApiKey`
+- `provider:setDefault` / `provider:getDefault`
+- `provider:validateKey` - Basic format validation
+
+#### `electron/preload/index.ts`
+Added all provider IPC channels to valid channels list.
+
+### React Renderer
+
+#### `src/stores/providers.ts` (New)
+Zustand store for provider management:
+- State: `providers`, `defaultProviderId`, `loading`, `error`
+- Actions: `fetchProviders`, `addProvider`, `updateProvider`, `deleteProvider`
+- Actions: `setApiKey`, `deleteApiKey`, `setDefaultProvider`, `validateApiKey`, `getApiKey`
+
+#### `src/components/settings/ProvidersSettings.tsx` (New)
+Provider management UI component:
+- `ProvidersSettings` - Main component orchestrating provider list
+- `ProviderCard` - Individual provider display with actions
+- `AddProviderDialog` - Modal for adding new providers
+
+Features:
+- Provider type icons (Anthropic, OpenAI, Google, Ollama, Custom)
+- Masked API key display (first 4 + last 4 characters)
+- Set default provider
+- Enable/disable providers
+- Edit/delete functionality
+- API key validation on add
+
+#### `src/pages/Settings/index.tsx`
+- Added AI Providers section with `ProvidersSettings` component
+- Added `Key` icon import
+
+## Technical Details
+
+### Security Architecture
+```
+Renderer Process                    Main Process
+      |                                  |
+      | provider:setApiKey               |
+      |--------------------------------->|
+      |                                  | safeStorage.encryptString()
+      |                                  |         |
+      |                                  |         v
+      |                                  |  System Keychain
+      |                                  |         |
+      |                                  |  electron-store
+      |                                  |  (encrypted base64)
+      |                                  |
+      | provider:getApiKey               |
+      |--------------------------------->|
+      |                                  | safeStorage.decryptString()
+      |<---------------------------------|
+      | (plaintext)                      |
+```
+
+### Provider Configuration Schema
+```typescript
+interface ProviderConfig {
+  id: string;
+  name: string;
+  type: 'anthropic' | 'openai' | 'google' | 'ollama' | 'custom';
+  baseUrl?: string;
+  model?: string;
+  enabled: boolean;
+  createdAt: string;
+  updatedAt: string;
+}
+```
+
+### Key Validation Rules
+- Anthropic: Must start with `sk-ant-`
+- OpenAI: Must start with `sk-`
+- Google: Minimum 20 characters
+- Ollama: No key required
+- Custom: No validation
+
+### ESM Compatibility
+electron-store v10+ is ESM-only. Solution: dynamic imports in main process.
+
+```typescript
+let store: any = null;
+async function getStore() {
+  if (!store) {
+    const Store = (await import('electron-store')).default;
+    store = new Store({ /* config */ });
+  }
+  return store;
+}
+```
+
+## Version
+v0.1.0-alpha (incremental)