Explain gas with the car-fuel analogy everywhere newcomers meet it (training, start, join funding box, chatbot, AI prompt)

public/chat.js

@@ -17,7 +17,7 @@
     {k:['cost','price','entry','how much','362','fee','pol needed','expensive'],
      a:()=>`Premium entry is <strong>${pol()} POL</strong> on Polygon Mainnet, plus a small extra POL balance for network gas. POL's dollar value changes with the market. Only ever use funds you can afford to lose.`},
     {k:['pol','polygon','network','chain','gas','matic','mainnet'],
-     a:()=>`The build runs on <strong>Polygon Mainnet</strong> (chain ID 137). POL is the network's native token — it pays for your Premium entry and for transaction gas. In MetaMask, make sure Polygon is the selected network before doing anything.`},
+     a:()=>`The build runs on <strong>Polygon Mainnet</strong> (chain ID 137). POL is the network's native token — it pays for your Premium entry AND for transaction "gas." Easiest way to think about gas: just like a car needs fuel to get from A to B, every blockchain transaction burns a tiny bit of POL to move. That's why you keep a little extra in the tank beyond your entry — a wallet that's bone-dry can't make the trip. In MetaMask, make sure Polygon is the selected network before doing anything.`},
     {k:['metamask','wallet','create wallet','install','set up wallet','setup wallet'],
      a:()=>`Install MetaMask only from the <a href="https://metamask.io/" target="_blank" rel="noopener noreferrer">official site</a> or your device's official app store, then create your wallet. <a href="/training">Video 2 in the training</a> walks through it step by step. Never share your Secret Recovery Phrase with anyone — not the team, not this site, not a "support agent".`},
     {k:['fund','funding','buy pol','get pol','deposit','exchange','transfer','send pol'],