…dd new icon components and tests

…nctions

…s, and session management

- Implemented `useLocale` hook for managing locale settings and strings.
- Created `useMessages` hook for handling chat messages and their parts.
- Developed `usePermissions` hook for managing tool permission requests.
- Added `useProviders` hook for managing AI model providers and their data.
- Introduced `useSession` hook for managing session states and events.
- Added comprehensive tests for each hook to ensure functionality and correctness.
- Created `AppContext` for centralized state management across the application.

- Implemented TodoHeader component to display summary and toggle list of todos.
- Created TodoView component to list individual todos with their status and priority.
- Added ChatHeader component for managing chat sessions with new session and toggle actions.
- Developed InputArea component for user input with file attachment and model selection features.
- Introduced MessageItem and MessagesArea components for displaying chat messages and interactions.
- Implemented PermissionView for handling permission requests in chat.
- Added SessionList component for managing chat sessions with delete and select functionality.
- Created ToolConfigPanel for configuring tool settings and managing locale options.
- Developed ToolPartView for displaying tool actions and outputs, including todo management.

… TextPartView components with functionality for message handling and context management

…ageItem, MessagesArea, TextPartView) to streamline codebase

… package.json and package-lock.json

…ish and Japanese

…andling in multiple components

…stent styling and improved accessibility

…sistent styling and improved functionality across multiple components

…stent styling and improved functionality in ToolConfigPanel and ModelSelector

…I consistency and functionality across various components

- Create ContextIndicator.module.css for context indicator styles
- Create IconButton.module.css for icon button styles
- Create LinkButton.module.css for link button styles
- Create ListItem.module.css for list item styles
- Create StatusItem.module.css for status item styles
- Create StreamingIndicator.module.css for streaming indicator styles
- Create DiffView.module.css for diff view styles
- Create EmptyState.module.css for empty state styles
- Create FileAttachmentBar.module.css for file attachment bar styles
- Create HashFilePopup.module.css for hash file popup styles
- Create ModelSelector.module.css for model selector styles
- Create TodoHeader.module.css for todo header styles
- Create TodoView.module.css for todo view styles
- Create ChatHeader.module.css for chat header styles
- Create InputArea.module.css for input area styles
- Create MessageItem.module.css for message item styles
- Create MessagesArea.module.css for messages area styles
- Create PermissionView.module.css for permission view styles
- Create SessionList.module.css for session list styles
- Create ToolConfigPanel.module.css for tool config panel styles
- Create ToolPartView.module.css for tool part view styles
- Add css-modules.d.ts for TypeScript support of CSS modules

- Implemented MessageItem component to display user and assistant messages with editing capabilities.
- Created MessagesArea component to manage and display a list of messages, including checkpoint functionality.
- Added PermissionView component to handle permission requests with user actions.
- Introduced ToolConfigPanel for configuring tool settings and locale preferences.
- Developed ToolPartView to visualize tool actions and outputs, including support for todos and file edits.
- Styled components with corresponding CSS modules for improved UI consistency.
- Added SessionList component to manage and display user sessions with delete functionality.