Introduce Comprehensive AI Chat and Contextual Interaction Features

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"Chat About This File"

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"Send to AI" - Full Context Submission

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This pull request introduces a major enhancement to PasteMax by integrating a suite of AI-powered features. These tools aim to provide users with advanced capabilities for code analysis, generation, and contextual understanding through seamless interaction with various Large Language Models (LLMs).

Key Features Implemented:

• Core AI Chat (ChatView.tsx, electron/llmService.js, App.tsx):
• A central chat interface for real-time conversations with LLMs.
• Supports multiple providers (OpenRouter, Mistral, Gemini, Groq) via a backend service.
• Manages message history, loading states, and errors within the active session.
• Persistent Chat History & Session Management (App.tsx, ChatView.tsx Sidebar):
• Chat conversations (ChatSession objects) are saved to localStorage and persist across application restarts.
• The integrated Chat Sidebar allows users to easily view, select, create, and delete chat sessions.
• User chats remain stored until explicitly deleted, adhering to project guidelines.
• LLM Settings Configuration (LlmSettingsModal.tsx, electron/llmService.js):
• A dedicated modal for users to configure API keys, base URLs, and other parameters for different LLM providers.
• Configurations are fetched from and saved to the backend, ensuring secure storage.
• System Prompt Editor (SystemPromptEditor.tsx, App.tsx):
• Empowers users to create, edit, select, and delete custom system prompts to tailor AI behavior.
• Prompts are persisted in localStorage, with default prompts available as a fallback.
• "Send to AI" - Full Context Submission (UserInstructions.tsx, App.tsx):
• Allows users to send the entire content of their selected files, combined with specific user instructions, directly to the AI for comprehensive processing.
• A new chat session is created for each full context submission.
• "Chat About This File" (FileList.tsx, App.tsx):
• Provides a convenient way to initiate an AI chat focused on the content of a single selected file, automatically providing file context to the LLM.

Documentation:

• A new documentation file, docs/features/ai-powered-features.md, has been added. It provides a detailed explanation of all the newly implemented AI features, their functionality, and key code changes.