feat(v4-solana): add support for jito bundles

[tomiiide]

Which Jira task is linked to this PR?

https://lifi.atlassian.net/browse/LF-16736
lifinance/sdk#343

Why was it implemented this way?

-N/A-

Visual showcase (Screenshots or Videos)

Screen.Recording.2026-02-02.at.12.03.40.mov

Testing Notes

1. Visit the demo url
2. Open the devtools
3. Do a solana swap from USD* to SOL
4. There should be a request to /stepTransaction?jitoBundle=true
5. The response payload should have a request.data object with an array value of transactions
6. The transaction should be submitted via a jito supported rpc , in our case, ....solana-mainnet.quiknode.pro/... instead of the standard helius rpc
7. Swap should complete

Checklist before requesting a review

• I have performed a self-review and testing of my code.
• This pull request is focused and addresses a single problem.
• If this PR modifies the Widget API or adds new features that require documentation, I have updated the documentation in the public-docs repository.

[github-actions]

Hey! This is your new endpoint: https://184f867b.widget-lf16736v4a.pages.dev

[chybisov]

I've updated packages on the main branch.