fix(onboarding): starter deposit is user-chosen

[dcccrypto]

Item 4 of the terminal UX fixes.

Problem: two onboarding paths deposited a system-chosen min(500, wallet balance) without the user ever picking a number — the silent AutoDepositProvider that fired after the faucet, and the one-click Start Trading CTA.

Fix:

• The Start Trading CTA now has an editable deposit amount field directly above it — prefilled with the suggested default once the wallet balance resolves (a user edit always wins over the prefill), clamped to the wallet balance so the folded init+deposit tx can't bounce. One-click onboarding is preserved for users who accept the prefill.
• AutoDepositProvider removed from the trade page (and the now-dead component deleted) — no deposit ever happens with an amount the user didn't see. The useAutoDeposit hook + its tests remain (shared AUTO_DEPOSIT_AMOUNT constant, and DepositWithdrawCard's editable prefill already let the user choose).
• Faucet modal step-3 copy updated ("Pick your deposit in the order ticket").

Verified: tsc --noEmit clean; test suite green except the 4 pre-existing Privy/ConnectButton env failures.

🤖 Generated with Claude Code

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Project	Deployment	Actions	Updated (UTC)
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