Chat History without exceeding storage limits

## Objective

Implement a solution for saving chat records without exceeding storage limits.

## Context

Currently, chat records are stored in local storage. Including images in chats can quickly exceed the storage capacity allowed by local storage.

## Scope

- **Included**:
- Change storage from local storage to IndexedDB.
- Provide user guidance about chat records being stored in the browser.
- Implement a feature to delete all chat records at once.
- **Not Included**:
- Any changes to chat functionality unrelated to storage.

## Success criteria

- Chat records are stored in IndexedDB without capacity issues.
- Users are informed that their chat records are saved in the browser.
- Users can delete all chat records with a single action.

## Risks and dependencies

- Potential issues with migrating existing chat records from local storage to IndexedDB.
- User acceptance of the new storage method and guidance.

## Other information

N/A

JIRA Issue: FR-1330