fix(buy-crypto): title the amount screen "Buy USDC" and polish fundin…

[mul53]

…g buttons

• Amount screen header now reads "Buy USDC" rather than "Buy crypto". It is titled independently in two places — getBuyCryptoTitle for the embedded card-funding flow and useDepositOption for the global deposit modal — so both are updated, along with the test that asserts they stay aligned.
• Drop the USD-equivalent line under the amount input. The field is already denominated in USDC, so "$3" under "3" only restated it; its Intl.NumberFormat computation goes with it.
• Set the enabled "Continue to payment" label to text-black at the call site. The brand variant already forces black, but the label had previously come out white in some renders (see the note in button.tsx).
• Read the local-currency chips on "Fund your wallet" from the static CARD_FUND_LOCAL_PAYMENT_METHODS map via getCardFundLocalPaymentMethods, matching what CardFundOptions already did. This drops three-to-four TransFi payment-config requests on open and renders the rails on first paint instead of once the responses land.
• Round both payment hand-off buttons to a pill and make the secondary label white. button.tsx appends rounded-[30px] to brand buttons after the caller's className, so the green button was already a pill and the grey one was not.

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2 Skipped Deployments

Project	Deployment	Actions	Updated
solid-app	Ignored		Sep 7, 2026 12:15pm UTC
solid-app-staging	Ignored		Sep 7, 2026 12:15pm UTC

[claude]

Code review

No issues found. Checked for bugs and CLAUDE.md compliance.