Implement full dispute UI with arbiter workflow

[GautamBytes]

This PR introduces a complete system for dispute resolution.

It implements a 2-of-3 multisig escrow using NUT-11 P2PK for secure Cashu payments. A new UI on the "Disputes" tab allows buyers, sellers, and an arbiter to communicate privately using NIP-59 gift-wrapped messages.

Buyers can initiate disputes from product pages after a purchase. The arbiter can then mediate and rule on the dispute to release the escrowed funds.

[vercel]

@GautamBytes is attempting to deploy a commit to the shopstr-eng Team on Vercel.

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[github-actions]

🚨 Linting & Formatting Report

ESLint found 36 issue(s). Run npx eslint --fix locally.

• [components/display-products.tsx:90:6] React Hook useEffect has missing dependencies: 'followsContext.followList' and 'followsContext.isLoading'. Either include them or remove the dependency array. (react-hooks/exhaustive-deps)
• [components/display-products.tsx:102:6] React Hook useEffect has a missing dependency: 'setCategories'. Either include it or remove the dependency array. If 'setCategories' changes too often, find the parent component that defines it and wrap that definition in useCallback. (react-hooks/exhaustive-deps)
• [components/display-products.tsx:129:6] React Hook useEffect has missing dependencies: 'onFilteredProductsChange', 'productSatisfiesAllFilters', and 'userPubkey'. Either include them or remove the dependency array. If 'onFilteredProductsChange' changes too often, find the parent component that defines it and wrap that definition in useCallback. (react-hooks/exhaustive-deps)

…and 33 more.

Prettier found formatting issues. Run npx prettier --write . locally.

🔍 Please fix these before merging.

[github-actions]

🚨 Linting & Formatting Report

ESLint found 36 issue(s). Run npx eslint --fix locally.

• [components/display-products.tsx:90:6] React Hook useEffect has missing dependencies: 'followsContext.followList' and 'followsContext.isLoading'. Either include them or remove the dependency array. (react-hooks/exhaustive-deps)
• [components/display-products.tsx:102:6] React Hook useEffect has a missing dependency: 'setCategories'. Either include it or remove the dependency array. If 'setCategories' changes too often, find the parent component that defines it and wrap that definition in useCallback. (react-hooks/exhaustive-deps)
• [components/display-products.tsx:129:6] React Hook useEffect has missing dependencies: 'onFilteredProductsChange', 'productSatisfiesAllFilters', and 'userPubkey'. Either include them or remove the dependency array. If 'onFilteredProductsChange' changes too often, find the parent component that defines it and wrap that definition in useCallback. (react-hooks/exhaustive-deps)

…and 33 more.

Prettier found formatting issues. Run npx prettier --write . locally.

🔍 Please fix these before merging.

[calvadev]

The quote state checks need to be here in order to prevent the proof minting race condition (this cause payments to go through, but the order messages and confirmation never go through)

[calvadev]

Same revisions needed here as previous comment of quote states.

[github-actions]

🚨 Linting & Formatting Report

ESLint found 48 issue(s). Run npx eslint --fix locally.

• [components/cart-invoice-card.tsx:133:64] Unexpected any. Specify a different type. (@typescript-eslint/no-explicit-any)
• [components/cart-invoice-card.tsx:557:24] Unexpected any. Specify a different type. (@typescript-eslint/no-explicit-any)
• [components/cart-invoice-card.tsx:630:66] Unexpected any. Specify a different type. (@typescript-eslint/no-explicit-any)

…and 45 more.

Prettier found formatting issues. Run npx prettier --write . locally.

🔍 Please fix these before merging.