feat(webapp): vendor vouch-ui console with delete/clear/archive ui

[plind-junior]

adds the vouch-ui react/vite console under webapp/ (vendored from vouchdev/webApp), carrying the new artifact-management ui:

• per-artifact delete: a capability-gated DeleteArtifactButton files kb.propose_delete from the drawer + claims panel
• pending: renders the delete proposal kind readably and adds a clear-queue action that rejects all pending with one reason
• claims: archive + supersede actions (ClaimLifecycleActions), and archived claims are hidden from the claims list so archive visibly removes them

the delete/archive/supersede actions are capability-gated, so they stay hidden until the endpoint advertises the backend methods. gate green: tsc --noEmit, 127 vitest, vite build.

What changed

Why

What might break

VEP

Tests

• make check passes locally (lint + mypy + pytest)
• New / changed behaviour has a test
• CHANGELOG.md updated under ## [Unreleased]

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