polish(lite): lite-appropriate wording for no-wallet/connection states

In lite builds there is no daemon, and isConnected() now tracks the lite wallet,
so the full-node "not connected / waiting for daemon" wording was misleading when
no wallet is open. Add two strings (lite_no_wallet, lite_no_wallet_short; English
built-ins, so other languages fall back until translated) and use them in lite:

- receive/send address preview + receive empty-state overlay + send "can't send"
  tooltip + transactions empty state -> "No wallet open [— create or open one in
  Settings]" instead of daemon wording.
- Status bar: the red indicator shows "No wallet open" (not "Disconnected") in
  lite; the P2P peer count is skipped (lite has no peers); and the redundant
  full-node connection-detail line is suppressed (connection_status_ set to
  "Connected"/"" from the lite wallet state).

Full-node wording unchanged (all gated on isLiteBuild()). Build + run clean
(no RPC noise), tests pass.

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

src/ui/windows/transactions_tab.cpp

@@ -578,7 +578,8 @@ void RenderTransactionsTab(App* app)
         {
             if (!app->isConnected()) {
                 ImGui::Dummy(ImVec2(0, 20));
-                Type().textColored(TypeStyle::Caption, OnSurfaceDisabled(), TR("not_connected"));
+                Type().textColored(TypeStyle::Caption, OnSurfaceDisabled(),
+                                   TR(app->isLiteBuild() ? "lite_no_wallet" : "not_connected"));
             } else if (state.transactions.empty()) {
                 ImGui::Dummy(ImVec2(0, 20));
                 if (txLoading) {