fix: persist confirm-tx view across popup close/reopen

The confirm-tx view was not in RESTORABLE_VIEWS, so closing and
reopening the popup would fall back to the main view, losing the
pending transaction confirmation.

Save pendingTx data to state.viewData when showing confirm-tx and
add confirm-tx to the set of restorable views with proper restore
logic.

Closes #77

src/popup/index.js

@@ -75,6 +75,7 @@ const RESTORABLE_VIEWS = new Set([
     "settings",
     "settings-addtoken",
     "transaction",
+    "confirm-tx",
     "success-tx",
     "error-tx",
 ]);
@@ -134,6 +135,13 @@ function restoreView() {
                 fallbackView();
             }
             break;
+        case "confirm-tx":
+            if (state.viewData && state.viewData.pendingTx) {
+                confirmTx.show(state.viewData.pendingTx);
+            } else {
+                fallbackView();
+            }
+            break;
         case "success-tx":
             if (state.viewData && state.viewData.hash) {
                 txStatus.renderSuccess();

src/popup/views/confirmTx.js

@@ -18,7 +18,7 @@ const {
     addressDotHtml,
     escapeHtml,
 } = require("./helpers");
-const { state } = require("../../shared/state");
+const { state, saveState } = require("../../shared/state");
 const { getSignerForAddress } = require("../../shared/wallet");
 const { decryptWithPassword } = require("../../shared/vault");
 const { formatUsd, getPrice } = require("../../shared/prices");
@@ -219,6 +219,10 @@ function show(txInfo) {
     $("confirm-fee-amount").textContent = "Estimating...";
     showView("confirm-tx");
 
+    // Persist txInfo so the view survives popup close/reopen
+    state.viewData = { pendingTx: txInfo };
+    saveState();
+
     estimateGas(txInfo);
 }