feat(claim): claim flow UI improvements (#432-#435)

[halimasbanna-sketch]

Summary

Resolves four issues related to the claim flow UI in frontend/app/claim/[token]/.

Changes

#435 — Already-claimed error state

• Split ClaimedPanel into two distinct sub-states: "claimed by you" (green success confirmation) and "claimed by someone else" (neutral informational).
• ClaimView gains a claimedByMe boolean, written to sessionStorage by markTokenClaimed() when a successful claim is made in the current session.
• loadClaimView reads sessionStorage on a 409 response to determine which sub-state to show.
• No re-claim action is offered in either case. A support email link is shown for disputes.

#434 — Expired-link error state

• ExpiredPanel now uses an amber colour scheme (not red) to visually differentiate expiry from failures.
• Copy updated to clearly state that funds are automatically returned to the sender — no money is lost.
• No claim action is rendered when the status is EXPIRED.

#433 — Auto-sweep confirmation UI

• After clicking Claim now → Confirm & send, a sweep-in-progress spinner state is shown (role="status") distinct from the initial claim step.
• A final success card then appears with the destination wallet address and the amount sent.
• CLAIMING panel updated with a "Funds are moving to your wallet" heading.
• PARTIAL_SWEEP panel shows "Finalizing your transfer" copy distinct from CLAIMING.

#432 — Existing-wallet connect path

• AvailablePanel now shows WalletConnect (Freighter) alongside the manual address entry — not hidden behind a toggle.
• Both paths go through a confirmation step (address + amount review) before the sweep fires.
• WalletConnect gains an onRejected callback so connection failures surface as contextual amber notices, keeping the manual path accessible.

Files changed

• frontend/lib/claim-view.ts — new fields + markTokenClaimed / wasClaimedByMe
• frontend/components/claim-status-card.tsx — updated panels for all four issues
• frontend/components/wallet-connect.tsx — onRejected prop
• frontend/app/claim/[token]/claim-page-client.tsx — passes new props, calls markTokenClaimed
• frontend/components/clainStatusCard.test.tsx — updated and new tests

Closes

Closes #432
Closes #433
Closes #434
Closes #435

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[phertyameen]

Merged to \main\ as part of a consolidated integration (branch \merge-final, now pushed as commit \5155235\ on main).

Validation on main:

• Frontend CI: green
• Lighthouse CI: green
• Mobile CI: Lint & Type Check, Unit Tests, and Android/iOS prebuild all green

Note: the Mobile CI Android/iOS native debug build jobs still fail on pre-existing repo issues unrelated to this PR (react-native-reanimated vs RN 0.81 compile error, and the macos-14 runner's Xcode 15.4 vs RN's required Xcode >= 16.1). Tracked as follow-up work, not blocked by this change.