feat(ContractEventFeed): Export JSON button, hover copy on topic tags, fromLedger prop for historical queries

[k-deejah]

Problem

1. ContractEventFeed does not support exporting events to JSON — developers analysing contract behaviour often need to export event data for offline analysis. A "Export JSON" button should download all currently loaded events as a .json file.

2. ContractEventFeed topic tags have no copy button — each topic tag in EventRow is a small pill. Developers who need to copy topic values to use in queries have to manually select text from the tiny pills. A hover-reveal copy button on each topic tag would improve the developer experience.

3. ContractEventFeed does not support setting a custom start ledger for fetching events — the feed always fetches from the most recent events. Adding a fromLedger?: number prop (passed through to getEvents) would allow developers to inspect historical events.

Solution

1. Add an "Export JSON" button to the card header that calls URL.createObjectURL(new Blob([JSON.stringify(events, null, 2)])) and triggers a download.
2. Add a hover-reveal copy button on each topic tag in EventRow.
3. Add fromLedger?: number prop to ContractEventFeed passed to getEvents in the load function.

Acceptance Criteria

• "Export JSON" button downloads events as a .json file
• Topic tags have a hover copy button
• fromLedger prop filters events from that ledger forward
• npm run build passes

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Note for Contributors: Write a clear PR description. Include a screenshot of the topic tag copy button and confirm the exported JSON is valid.

[adeboladee]

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Hello Maintainer, Please I would like to work on this issue

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[Binali223]

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Hi Maintainer! I'd like to work on this issue. I've reviewed the requirements and I'm confident I can implement the requested changes. Thank you!

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[almuslavish]

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[nomsoscript]

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Hi maintainers!
I’d love to help out with this issue. I’ve checked the current codebase/documentation and know exactly what needs to be updated to make this clearer. I will ensure everything aligns perfectly with your existing contribution guidelines.

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