feat: add retry buttons for recoverable error states

[AlonsoFi]

Closes #266

Implements retry actions for account loading failures, verification status check failures, and transaction polling failures per issue.

• wallet-states.ts: add "account-error" state with "Try Again" action
• useWalletPageGate: expose retryAccountLoad from useStellarAccount; surface "account-error" when Stellar account fetch fails with a non-funding error (e.g. network timeout)
• WalletStatePanel: add "account-error" icon (red AlertCircle), onRetry prop wired to the primary action button
• VerificationStatus: add error state; on fetch failure show an error card with a "Try Again" button instead of silently falling back to NONE
• projects/[id]/page: add verificationError state + retryVerification callback; show inline Retry button in the sidebar verification card; pass onRetry to WalletStatePanel in the reviews gate
• All pages using WalletStatePanel (admin, profile, verify, reviews, edit, new) now forward onRetry={gate.retryAccountLoad}

Acceptance criteria covered:

• Recoverable error states expose retry actions
• Retry resets loading/error state before re-fetching
• No duplicate submissions (retry reuses existing ref, not a new call)

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