feat(widget): add private mode requiring send-to-wallet address

[effie-ms]

Which Linear task is linked to this PR?

N/A

Why was it implemented this way?

Private mode is modeled as a modeOptions.private boolean flag rather than a new WidgetMode value. This keeps the WidgetMode union untouched (no exhaustive mode switch needs a new case) and lets private compose orthogonally with the underlying mode.

The Private header tab (in jumper-simple) is now { mode: 'split', modeOptions: { split: 'swap', private: true } } — it keeps its swap-only behavior and additionally forces the "Send to wallet" recipient. A small usePrivateMode hook (mirroring useSplitMode/useSwapOnly) reads the flag from the active tab, falling back to root config. The requirement is enforced through the existing requiredToAddress path in useToAddressRequirements, which already drives both the Send-to-wallet "Required" label and the disabled Review button — so no extra branching was needed.

Visual showcase (Screenshots or Videos)

N/A

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.

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Latest commit: 4385de1

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E2E Playground results

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Details

 158 tests across 10 suites
 2 minutes, 4 seconds
 4385de1

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