feat: Add Diff View and File History Tracking

- Implemented a new Diff View in the Workbench to visualize file changes
- Added file history tracking with detailed change information
- Enhanced FileTree and FileModifiedDropdown to show line additions and deletions
- Integrated file history saving and retrieval in ActionRunner
- Updated Workbench view types to include 'diff' option
- Added support for inline and side-by-side diff view modes

README.md

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 Welcome to bolt.diy, the official open source version of Bolt.new (previously known as oTToDev and bolt.new ANY LLM), which allows you to choose the LLM that you use for each prompt! Currently, you can use OpenAI, Anthropic, Ollama, OpenRouter, Gemini, LMStudio, Mistral, xAI, HuggingFace, DeepSeek, or Groq models - and it is easily extended to use any other model supported by the Vercel AI SDK! See the instructions below for running this locally and extending it to include more models.
 
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 Check the [bolt.diy Docs](https://stackblitz-labs.github.io/bolt.diy/) for more offical installation instructions and more informations.
 
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 Also [this pinned post in our community](https://thinktank.ottomator.ai/t/videos-tutorial-helpful-content/3243) has a bunch of incredible resources for running and deploying bolt.diy yourself!
 
 We have also launched an experimental agent called the "bolt.diy Expert" that can answer common questions about bolt.diy. Find it here on the [oTTomator Live Agent Studio](https://studio.ottomator.ai/).
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 - ✅ Add Starter Template Options (@thecodacus)
 - ✅ Perplexity Integration (@meetpateltech)
 - ✅ AWS Bedrock Integration (@kunjabijukchhe)
+- ✅ Add a "Diff View" to see the changes (@toddyclipsgg)
 - ⬜ **HIGH PRIORITY** - Prevent bolt from rewriting files as often (file locking and diffs)
 - ⬜ **HIGH PRIORITY** - Better prompting for smaller LLMs (code window sometimes doesn't start)
 - ⬜ **HIGH PRIORITY** - Run agents in the backend as opposed to a single model call