feat(bounty): cancel / refund flow in settings tab (#634)

[Benjtalkshow]

What

Implements the FE cancel / refund flow (#634) for the bounty operate dashboard's Settings tab. If a bounty gets no acceptable submissions (or the organizer aborts), they cancel it and the escrow refunds contributors first, then the owner residual.

Changes

• hooks/use-bounty-cancel.ts (new) — drives the single cancel escrow op through useEscrowOpRunner (organizer scope), mirroring useBountyPayout. MANAGED signs server-side; EXTERNAL signs the returned unsigned XDR via the wallet kit. On settle it toasts and invalidates the overview query so the dashboard reflects CANCELLED immediately.
• components/organization/bounties/manage/BountySettingsPanel.tsx (new) — the Settings tab. A danger-zone card explains the refund order and gates the action behind a confirm dialog that requires typing CANCEL. Shows live phase progress while running, and a success card with the refund transaction explorer link on settle. The action is hidden for drafts (no funded escrow) and terminal (completed/cancelled) bounties.
• BountyManagementDashboard.tsx — wired BountySettingsPanel into the Settings tab; removed the now-unused placeholder helper and import.

Acceptance criteria

• Cancel action in management settings with an explicit confirmation explaining the refund (contributor-first, then owner).
• Builds the cancel escrow op, drives useEscrowOpRunner -> progress -> CANCELLED.
• Reflects CANCELLED state + refund tx.

Notes

• Mirrors the existing bounty POST .../escrow/cancel endpoint; the organizer escrow client cancel already existed.
• Verified with tsc --noEmit (0 errors).

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