refactor(trader): drop user-facing on-chain wording from copy

[Gift-Stack]

Stacked on #101. Removes user-facing "on-chain" jargon from the trader UI, per the product's first design principle (the chain is plumbing; it's never advertised in the UI). No behavior changes, copy only.

Visible UI

• EvaluationCockpit: the equity chip ON-CHAIN becomes VERIFIED (tooltip: "Realized equity is verified; live P&L overlaid").
• HeroRail: "tracked on-chain" becomes "tracked and independently verifiable".
• CohortSpotlight: heading "A closed-beta prop evaluation on-chain" becomes "A closed-beta prop evaluation".
• StartPageClient: "your on-chain evaluation account" becomes "your evaluation account".
• TradeIntentForm: "Account suspended on-chain" becomes "Account suspended" (and the sibling disabled reasons drop the em dashes).
• CreateAccountFlow: "recorded on-chain and can't be altered" becomes "recorded and can't be altered".

Error / status messages (surfaced to the trader via serverError)

• API route fallbacks (positions/open, trades/close, evaluation pass + fail, reactivate, breach), onboarding payment errors, the account-id error, and the tier-read errors all drop "on-chain".
• Username claim/pending messages drop "on-chain" and switch "mint" to "claim" to match the Claim button.

Kept intentionally

• The NFT link label on the username card.
• OG metadata alt text in layout.tsx.
• Developer log strings and code comments (dev/ops facing, where "on-chain" is meaningful).

Follow-up (not in this PR)

packages/shared/sui-propfirm/src/signer.ts throws "On-chain call failed", which reaches the trader when a tx aborts. Left out because it's in the shared package used by the executor service too. Can add it here on request.

Verified: tsc --noEmit clean, 120/120 tests pass.

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Project	Deployment	Actions	Updated (UTC)
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