feat(send): show fee + total on the compose form; fix the stuck confirm on recheck

- The network fee and running total are now shown on the compose form (once an
  amount is entered), instead of only being revealed in the confirm popup.
- When the pre-broadcast re-validation fails (balance dropped, sync restarted,
  fee pushed total over available), the confirm popup now closes and surfaces a
  warning toast — previously the reason was drawn on the form behind the still-
  open popup, so the user was left re-clicking a button that did nothing.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/ui/windows/send_tab.cpp

@@ -896,6 +896,10 @@ void RenderSendConfirmPopup(App* app) {
                 s_tx_status = TR("send_cannot_send_now");
                 s_status_success = false;
                 s_status_timestamp = ImGui::GetTime();
+                // The status renders on the form BEHIND this popup, so surface it visibly and close the
+                // popup — otherwise the user is stuck re-clicking a button that silently does nothing.
+                Notifications::instance().warning(TR("send_cannot_send_now"));
+                s_show_confirm = false;
               }
               // A locked encrypted lite wallet can't spend; prompt to unlock instead of sending
               // (the backend would otherwise reject with "Wallet is locked").
@@ -1013,6 +1017,17 @@ static void RenderActionButtons(App* app, float width, float vScale,
                     sourceSpendable &&
                     !s_sending;
 
+    // Network fee + running total on the compose form — previously the fee was only revealed in the
+    // confirm popup, so the user couldn't see it (or the total) before committing to Review.
+    if (s_amount > 0.0) {
+        char feeLine[160];
+        snprintf(feeLine, sizeof(feeLine), "%s %.8f %s   \xC2\xB7   %s %.8f %s",
+                 TR("send_network_fee_label"), s_fee, DRAGONX_TICKER,
+                 TR("send_total_label"), total, DRAGONX_TICKER);
+        Type().textColored(TypeStyle::Caption, OnSurfaceMedium(), feeLine);
+        ImGui::Dummy(ImVec2(0, Layout::spacingXs()));
+    }
+
     float btnGap = Layout::spacingMd();
     float cancelBtnW = std::max(schema::UI().drawElement("tabs.send", "cancel-btn-min-width").size, width * S.drawElement("tabs.send", "cancel-btn-width-ratio").size);
     float sendBtnW = width - cancelBtnW - btnGap;

src/util/i18n.cpp

@@ -2550,6 +2550,8 @@ void I18n::loadBuiltinEnglish()
         strings_["send_go_to_receive"] = "Go to Receive";
         strings_["send_keep"] = "Keep";
         strings_["send_network_fee"] = "NETWORK FEE";
+        strings_["send_network_fee_label"] = "Network fee:";
+        strings_["send_total_label"] = "Total:";
         strings_["send_no_balance"] = "No balance";
         strings_["send_no_recent"] = "No recent sends";
         strings_["send_recent_sends"] = "RECENT SENDS";