Closes#993
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## Summary by CodeRabbit
- **New Features**
- Added a detailed explanation page for the "Remember user" setting in
the app documentation.
- Introduced persistence of chat state across sessions, with options for
local or session storage.
- Enhanced bot functionality to store and retrieve initial chat replies
and manage bot open state with improved storage handling.
- Added a new callback for chat state persistence to bot component
props.
- **Improvements**
- Updated the general settings form to clarify the description of the
"Remember user" feature.
- Enhanced custom CSS handling and progress value persistence in bot
components.
- Added conditional transition disabling in various components for
smoother user experiences.
- Simplified the handling of `onTransitionEnd` across multiple bubble
components.
- **Refactor**
- Renamed `inputIndex` to `chunkIndex` or `index` in various components
for consistency.
- Removed unused ESLint disable comments related to reactivity rules.
- Adjusted import statements and cleaned up code across several files.
- **Bug Fixes**
- Fixed potential issues with undefined callbacks by introducing
optional chaining in component props.
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