Add dedicated wait/success/error screens for transaction status

After broadcast, the user is taken to a full-screen wait view showing
the amount, recipient, tx hash (copyable + etherscan link), and a
count-up timer. The view polls every 10 seconds for confirmation.

On confirmation: navigates to success screen showing block number,
tx hash, and a Done button that returns to the address view.

On 60-second timeout or error: navigates to error screen with the
failure message, tx hash (if available), and Done button.

Replaces the previous inline confirm-status div that was crammed
onto the confirmation page.

src/popup/index.js

@@ -15,6 +15,7 @@ const addressDetail = require("./views/addressDetail");
 const addressToken = require("./views/addressToken");
 const send = require("./views/send");
 const confirmTx = require("./views/confirmTx");
+const txStatus = require("./views/txStatus");
 const receive = require("./views/receive");
 const addToken = require("./views/addToken");
 const settings = require("./views/settings");
@@ -111,6 +112,7 @@ async function init() {
     addressToken.init(ctx);
     send.init(ctx);
     confirmTx.init(ctx);
+    txStatus.init(ctx);
     receive.init(ctx);
     addToken.init(ctx);
     settings.init(ctx);