refactor: clean up Trade component by removing commented code and simplifying error handling

apps/web/src/components/Account/CreatorCoin/Trade.tsx

···
   const [tokenBalance, setTokenBalance] = useState<bigint>(0n);
   const [estimatedOut, setEstimatedOut] = useState<string>("");
 
-  // balances
   useEffect(() => {
     (async () => {
       if (!address) return;
···
         ]);
         setEthBalance(eth);
         setTokenBalance(token as bigint);
-      } catch {
-        // ignore
-      }
+      } catch {}
     })();
   }, [address, coin.address, publicClient]);
 
-  const tokenDecimals = 18; // ZORA20 tokens have 18 decimals
+  const tokenDecimals = 18;
 
   const setPercentAmount = (pct: number) => {
     const decimals = 6;
     if (mode === "buy") {
       const available = Number(formatEther(ethBalance));
-      const gasReserve = 0.0002; // leave a tiny bit for gas on Base
+      const gasReserve = 0.0002;
       const baseAmt = (available * pct) / 100;
       const amt = pct === 100 ? Math.max(baseAmt - gasReserve, 0) : baseAmt;
       setAmount(amt.toFixed(decimals));

apps/web/vite.config.mjs

···
     tsconfigPaths(),
     react(),
     tailwindcss(),
-    // Expose env vars to client-side code (process.env.*)
-    // Provide a safe default for HEY_API_URL to avoid build-time errors.
     EnvironmentPlugin({
       HEY_API_URL: "https://api.hey.xyz",
       LENS_NETWORK: undefined