feat(request,balance): Request-Payment create-address empty-state + tx empty states

- Request-Payment no longer dead-ends with no shielded address: it shows a hint
  and a "Create a shielded address" button (auto-selecting the new address), and
  labels address entries with their contact/wallet names.
- The balance "Recent transactions" empty area uses a proper empty-state and now
  distinguishes "still loading / syncing" from "no transactions yet" instead of a
  dim one-liner that also showed mid-sync.

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

src/ui/windows/balance_components.cpp

@@ -1057,7 +1057,27 @@ void RenderSharedRecentTx(App* app, float recentH, float availW, float hs, float
     int count = std::min({4, maxRows, (int)txs.size()});  // show only the most recent (state.transactions is newest-first)
 
     if (count == 0) {
-        Type().textColored(TypeStyle::Caption, OnSurfaceDisabled(), TR("no_transactions_yet"));
+        const bool roomForIcon = ImGui::GetContentRegionAvail().y >= 100.0f * dp;
+        if (!app->isConnected()) {
+            // Disconnected: not "empty" and not "loading" — keep a plain caption.
+            Type().textColored(TypeStyle::Caption, OnSurfaceDisabled(),
+                               TR(app->isLiteBuild() ? "lite_no_wallet" : "not_connected"));
+        } else {
+            const std::string txLoadingText = app->transactionRefreshProgressText();
+            // In lite, transactionRefreshProgressText() is empty and last_tx_update is stamped differently,
+            // so treat only an active sync as "loading" there.
+            const bool loadingOrSyncing = !txLoadingText.empty() ||
+                (state.sync.syncing && !state.sync.isSynced()) ||
+                (!app->isLiteBuild() && state.last_tx_update == 0);
+            if (loadingOrSyncing) {
+                char lbuf[192];
+                const char* base = !txLoadingText.empty() ? txLoadingText.c_str() : TR("loading_transactions");
+                snprintf(lbuf, sizeof(lbuf), "%s%s", base, material::LoadingDots());
+                material::DrawEmptyState(roomForIcon ? ICON_MD_HOURGLASS_EMPTY : nullptr, lbuf);
+            } else {
+                material::DrawEmptyState(roomForIcon ? ICON_MD_RECEIPT_LONG : nullptr, TR("no_transactions_yet"));
+            }
+        }
     } else {
         ImDrawList* dl = ImGui::GetWindowDrawList();
         ImFont* capFont = Type().caption();