refactor: quote request input state management

[0xjorgen]

Refactors the quote request state to use explicit user input tracking instead of trade type inference.

Changes

State Model

• Replace tradeType ("exactInput" | "minOutput") + amount with explicit userInputField ("origin" | "destination") + userInputAmount + quoteOutputAmount
• Separate user input from quote output for clearer data flow
• Reset amounts when tokens change

Hooks

• Add useTokenAmountInput hook to handle input state for both origin/destination fields
• Remove old useTokenInput hook
• Replace setOriginAmount/setDestinationAmount with unified setUserInput(field, amount) + setQuoteOutput(amount)

Components

• Rename DestinationTokenDisplay → DestinationTokenInput for consistency
• Inline ToggleUnitButton styles into shared styles file
• Remove unused tracking hooks (useTrackToggleUnit, useTrackChainSelected, useTrackTokenSelected, useTrackBalanceSelectorClick)

API Cleanup

• Remove sponsored bridge strategies (CCTP-sponsored, OFT-sponsored)
• Remove sponsorship eligibility and routing logic
• Consolidate sponsorship signing utilities

[vercel]

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Project	Deployment	Review	Updated (UTC)
app-frontend-v3	Ready	Preview, Comment	Dec 16, 2025 1:14pm
sepolia-frontend-v3	Ready	Preview, Comment	Dec 16, 2025 1:14pm

[linear]

FE-211 Format input field to match output field format

[vercel]

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