Use shared decodeCalldata in approval view

Replace the local decodeCalldata function in approval.js with
an import from the new shared module.

src/popup/views/approval.js

@@ -3,6 +3,7 @@ const { state, saveState } = require("../../shared/state");
 const { formatEther, formatUnits, Interface, toUtf8String } = require("ethers");
 const { ERC20_ABI } = require("../../shared/constants");
 const { TOKEN_BY_ADDRESS } = require("../../shared/tokenList");
+const { decodeCalldata } = require("../../shared/decodeCalldata");
 const txStatus = require("./txStatus");
 const uniswap = require("../../shared/uniswap");
 
@@ -41,91 +42,7 @@ function etherscanTokenLink(address) {
     return `https://etherscan.io/token/${address}`;
 }
 
-// Try to decode calldata using known ABIs.
-// Returns { name, description, details } or null.
-function decodeCalldata(data, toAddress) {
-    if (!data || data === "0x" || data.length < 10) return null;
-
-    // Try ERC-20 (approve / transfer)
-    try {
-        const parsed = erc20Iface.parseTransaction({ data });
-        if (parsed) {
-            const token = TOKEN_BY_ADDRESS.get(toAddress.toLowerCase());
-            const tokenSymbol = token ? token.symbol : null;
-            const tokenDecimals = token ? token.decimals : 18;
-            const contractLabel = tokenSymbol
-                ? tokenSymbol + " (" + toAddress + ")"
-                : toAddress;
-
-            if (parsed.name === "approve") {
-                const spender = parsed.args[0];
-                const rawAmount = parsed.args[1];
-                const maxUint = BigInt(
-                    "0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff",
-                );
-                const isUnlimited = rawAmount === maxUint;
-                const amountStr = isUnlimited
-                    ? "Unlimited"
-                    : formatTxValue(formatUnits(rawAmount, tokenDecimals)) +
-                      (tokenSymbol ? " " + tokenSymbol : "");
-
-                return {
-                    name: "Token Approval",
-                    description: tokenSymbol
-                        ? "Approve spending of your " + tokenSymbol
-                        : "Approve spending of an ERC-20 token",
-                    details: [
-                        {
-                            label: "Token",
-                            value: contractLabel,
-                            address: toAddress,
-                            isToken: true,
-                        },
-                        {
-                            label: "Spender",
-                            value: spender,
-                            address: spender,
-                        },
-                        { label: "Amount", value: amountStr },
-                    ],
-                };
-            }
-
-            if (parsed.name === "transfer") {
-                const to = parsed.args[0];
-                const rawAmount = parsed.args[1];
-                const amountStr =
-                    formatTxValue(formatUnits(rawAmount, tokenDecimals)) +
-                    (tokenSymbol ? " " + tokenSymbol : "");
-
-                return {
-                    name: "Token Transfer",
-                    description: tokenSymbol
-                        ? "Transfer " + tokenSymbol
-                        : "Transfer ERC-20 token",
-                    details: [
-                        {
-                            label: "Token",
-                            value: contractLabel,
-                            address: toAddress,
-                            isToken: true,
-                        },
-                        { label: "Recipient", value: to, address: to },
-                        { label: "Amount", value: amountStr },
-                    ],
-                };
-            }
-        }
-    } catch {
-        // Not ERC-20 — fall through
-    }
-
-    // Try Uniswap Universal Router
-    const routerResult = uniswap.decode(data, toAddress);
-    if (routerResult) return routerResult;
-
-    return null;
-}
+// decodeCalldata is now in ../../shared/decodeCalldata.js
 
 function showTxApproval(details) {
     const toAddr = details.txParams.to;