FIX: Support React StrictMode by re-registering components on mount

[Talha12Shiekh]

Proposed Changes

Ensures all ReactiveSearch components function correctly under React's StrictMode (in development mode) by making Redux component registration resilient to double-mounting cycles:

1. Mount Safeguard (componentDidMount): Added a validation step in ComponentWrapper.js and DynamicRangeSlider.js that checks if a component is registered in the Redux store. If missing (e.g. unmounted/removed due to StrictMode double-rendering), it automatically re-registers and re-binds watchers.
2. Fixed Unmount Cleanup Typo (ComponentWrapper.js): Corrected a typo in componentWillUnmount (this.$timestamp -> this._timestamp), resolving component leaks in the Redux store on real component unmounts.
3. Map State to Props: Added components state map in DynamicRangeSlider's mapStateToProps to enable mount-time existence checks.

Linked Issues

• Fixes React StrictMode incompatibility in development causing SearchBox and ReactiveList components to fail #2314 (bug: components fail to function properly when wrapped in StrictMode)

Checklist

• Describe the proposed changes and how it'll improve the library experience.
• Please make sure that there are no linting errors in the code.
• Add a demo video/gif/screenshot to explain how did you test the fix.
• If it is a global change, try to add any side effects that it could have.
• Create a PR to add/update the docs (if needed) at here.
• Create a PR to add/update the storybook (if needed) at here.

Improvements to the Library Experience

• StrictMode Compatibility: Resolves the critical development-mode bug where keystrokes fail to fire queries, URL parameters vanish, and results fail to display when components are wrapped in React's <StrictMode>.
• Zero Resource Leaks: Ensures Redux store properly cleans up components and queries on genuine unmounts by fixing the timestamp property typo.

Side Effects

• None. This preserves the existing store and component registration flows but ensures robustness when React performs double-mount checks.

Testing

• Successfully compiled the modified components to CommonJS/ES modules with Babel (yarn build).
• Verified code structure is clean and syntactically correct.