Port LoadingState/EmptyState/ErrorState/StateBoundary/Spinner into @loopover/ui-kit proper

[JSONbored]

Context

Epic #6504 ("Miner dashboard redesign") requires a shared async-state primitive both the miner-ui visual restyle and the chat message list can consume, so the two tracks never invent two different loading/error/empty implementations. apps/loopover-ui/src/components/site/state-views.tsx already has LoadingState/EmptyState/ErrorState/StateBoundary/Spinner, confirmed reusable as-is by the #6244 audit (apps/loopover-ui/src/chat-ui-primitives-audit.md, merged via #6474). It currently lives app-local to apps/loopover-ui, not in the shared @loopover/ui-kit package apps/loopover-miner-ui can import from.

Requirements

• Port LoadingState, EmptyState, ErrorState, StateBoundary, and Spinner from apps/loopover-ui/src/components/site/state-views.tsx into packages/loopover-ui-kit/src/components/, preserving their existing API exactly (no behavior change for apps/loopover-ui's own usages).
• Update apps/loopover-ui to import the ported versions from @loopover/ui-kit instead of its local copy, removing the duplicate.
• Do not modify the components' behavior as part of this port — this is a relocation, not a redesign.

Deliverables

• LoadingState/EmptyState/ErrorState/StateBoundary/Spinner added to packages/loopover-ui-kit/src/components/
• apps/loopover-ui's local copy removed, imports repointed to @loopover/ui-kit
• Existing apps/loopover-ui tests still pass unchanged

Test Coverage Requirements

99%+ Codecov patch coverage on every changed line and branch, plus a regression test for the new/changed behavior (note: apps/** UI code may fall outside the strict Codecov patch gate — check coverage.include — but a before/after screenshot table per this repo's UI-PR convention is still required for any visual change).

Expected Outcome

Both apps/loopover-ui and apps/loopover-miner-ui can import the same async-state primitives from @loopover/ui-kit, with zero behavior change to existing usages.

Links & Resources

Epic: #6504. apps/loopover-ui/src/components/site/state-views.tsx, apps/loopover-ui/src/chat-ui-primitives-audit.md (#6244, merged via #6474).

[linear-code]

JSO-4710

[JSONbored]

Already done — via #6506, not this issue. Confirmed against current code:

• `packages/loopover-ui-kit/src/components/state-views.tsx` already exports all of `Spinner`, `LoadingState`, `EmptyState`, `StateActionButton`, `ErrorState`, `StateBoundary`.
• `apps/loopover-ui/src/components/site/state-views.tsx` is already a thin wrapper re-exporting from `@loopover/ui-kit/components/state-views` (its own comment cites ui-kit: port state-views.tsx (LoadingState/EmptyState/ErrorState/StateBoundary) into @loopover/ui-kit #6506), with only `StateBoundary` getting a real wrapper (to inject `notifyApiFailure`) — exactly the "preserve existing API exactly" shape this issue asked for.
• `apps/loopover-miner-ui` is already importing and using it in at least 5 files (`components/chat/message-list.tsx`, `routes/index.tsx`, `routes/ledgers.tsx`, `routes/run-history.tsx`, `routes/portfolio.tsx`).

Closing as already resolved.