Fix/invoice wallet select v2

[russo2100]

```mermaid
graph LR
    A[gig.payment_coin] -->|e.g. USDC| B(workerWallets)
    B --> C{Fuzzy Prefix Match}
    C -->|w.currency.startsWith| D[usdc_sol ✅ Correct Wallet Selected]
    C -->|w.currency === gigCoin| E[USDC ✅ Correct Wallet Selected]
    C -->|No match| F[Fallback to index 0 ⚠️]

🧪 Testing

• The frontend compiles successfully without Cannot find name 'isWorker' errors.
• Submitting an invoice as a poster properly queries and assigns the worker's correct cryptocurrency receiving wallet.

[greptile-apps]

Greptile Summary

This PR fixes invoice submission for poster users by skipping wallet selection in the frontend and adding server-side wallet auto-selection in the backend, where the worker's wallets are matched against the gig's payment_coin using an exact match or a prefix match on the base coin symbol (e.g. "usdc_" for "USDC").

• InvoiceButton.tsx: isWorker is now threaded into InvoiceForm; the wallet picker UI and wallet-selection guard are hidden/skipped for poster users, and the submit button's disabled condition is relaxed to isWorker && !hasWallets.
• route.ts: Wallet selection/validation is moved after workerWallets is fetched; when payment_currency/merchant_wallet_address are absent the backend auto-selects the best matching wallet (or falls back to workerWallets[0]), allowing posters to create invoices without needing to know the worker's wallet details.

Confidence Score: 5/5

Safe to merge; the poster invoice flow works correctly for the common case and the worker path is unchanged.

The core logic change is straightforward: the poster path now omits wallet fields from the request and the backend auto-selects from the worker's wallets using a base-symbol prefix match. The fallback to workerWallets[0] is an acknowledged edge case flagged in the PR diagram. The only finding is an unreachable else branch that is dead code with no runtime impact.

No files require special attention; the dead-code else branch in route.ts is harmless but could be cleaned up.

Important Files Changed

Filename	Overview
src/app/api/gigs/[id]/invoice/route.ts	Adds server-side wallet auto-selection when poster submits invoice without wallet info; fallback to workerWallets[0] is acknowledged. The else branch inside the new auto-selection block is unreachable dead code.
src/components/gigs/InvoiceButton.tsx	Conditionally hides wallet selection UI and skips wallet validation for non-worker (poster) users; passes isWorker prop down to InvoiceForm; adjusts submit button disabled state accordingly.

Sequence Diagram

%%{init: {'theme': 'neutral'}}%%
sequenceDiagram
    participant P as Poster / Worker
    participant FE as InvoiceButton.tsx
    participant API as POST /api/gigs/[id]/invoice
    participant CP as CoinPay

    P->>FE: Click "Send Invoice"
    alt isWorker
        FE->>FE: Require wallet selection (selectedWalletCurrency + selectedWalletAddress)
    else isPoster
        FE->>FE: Skip wallet selection (both undefined)
    end
    FE->>API: "POST { payment_currency?, merchant_wallet_address? }"

    API->>CP: getConnectedCoinpayAccessToken(workerId)
    CP-->>API: workerCoinpayToken
    API->>CP: getCoinpayGlobalWalletTokens(token)
    CP-->>API: workerWallets[]

    alt payment_currency and address provided (Worker path)
        API->>API: "selectedCurrency = preferredCoinToPaymentCurrency(payment_currency)"
    else missing (Poster path)
        API->>API: "baseCoin = gig.payment_coin.toLowerCase()"
        API->>API: "gigCoin = preferredCoinToPaymentCurrency(gig.payment_coin)"
        API->>API: "preferred = workerWallets.find(exact or prefix match) || workerWallets[0]"
        API->>API: "selectedCurrency = preferred.currency"
        API->>API: "selectedAddress = preferred.address"
    end

    API->>API: findCoinpayGlobalWallet(workerWallets, selectedCurrency, selectedAddress)
    API->>CP: Create CoinPay invoice
    CP-->>API: invoice data
    API-->>FE: "200 { invoice_id, pay_url, ... }"
    FE-->>P: Show invoice / pay URL

Loading

%%{init: {'theme': 'base', 'themeVariables': {"darkMode": true, "background": "#0d1117", "primaryColor": "#21262d", "primaryTextColor": "#e6edf3", "primaryBorderColor": "#8b949e", "lineColor": "#8b949e", "textColor": "#e6edf3", "edgeLabelBackground": "#161b22", "actorBkg": "#21262d", "actorBorder": "#8b949e", "actorTextColor": "#e6edf3", "actorLineColor": "#8b949e", "signalColor": "#8b949e", "signalTextColor": "#e6edf3", "noteBkgColor": "#373320", "noteBorderColor": "#d4a72c", "noteTextColor": "#f0e6c0", "labelBoxBkgColor": "#21262d", "labelBoxBorderColor": "#8b949e", "labelTextColor": "#e6edf3", "loopTextColor": "#e6edf3", "activationBkgColor": "#30363d", "activationBorderColor": "#8b949e"}}}%%
sequenceDiagram
    participant P as Poster / Worker
    participant FE as InvoiceButton.tsx
    participant API as POST /api/gigs/[id]/invoice
    participant CP as CoinPay

    P->>FE: Click "Send Invoice"
    alt isWorker
        FE->>FE: Require wallet selection (selectedWalletCurrency + selectedWalletAddress)
    else isPoster
        FE->>FE: Skip wallet selection (both undefined)
    end
    FE->>API: "POST { payment_currency?, merchant_wallet_address? }"

    API->>CP: getConnectedCoinpayAccessToken(workerId)
    CP-->>API: workerCoinpayToken
    API->>CP: getCoinpayGlobalWalletTokens(token)
    CP-->>API: workerWallets[]

    alt payment_currency and address provided (Worker path)
        API->>API: "selectedCurrency = preferredCoinToPaymentCurrency(payment_currency)"
    else missing (Poster path)
        API->>API: "baseCoin = gig.payment_coin.toLowerCase()"
        API->>API: "gigCoin = preferredCoinToPaymentCurrency(gig.payment_coin)"
        API->>API: "preferred = workerWallets.find(exact or prefix match) || workerWallets[0]"
        API->>API: "selectedCurrency = preferred.currency"
        API->>API: "selectedAddress = preferred.address"
    end

    API->>API: findCoinpayGlobalWallet(workerWallets, selectedCurrency, selectedAddress)
    API->>CP: Create CoinPay invoice
    CP-->>API: invoice data
    API-->>FE: "200 { invoice_id, pay_url, ... }"
    FE-->>P: Show invoice / pay URL

Loading

_{Reviews (2): Last reviewed commit: "fix(invoice): correct fuzzy match to use..." | Re-trigger Greptile}

[greptile-apps]

Unreachable error branch

The else block that returns a 400 "Select a CoinPay receiving wallet" error can never execute. preferred is assigned as workerWallets.find(...) || workerWallets[0], and the earlier guard at line 332 already short-circuits with a 409 when workerWallets is empty, so workerWallets[0] is always a valid object at this point. The if (preferred) check and its else branch are therefore dead code and can be removed.