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/send_tab.cpp

@@ -230,7 +230,7 @@ static void RenderSourceDropdown(App* app, float width) {
 
     // Build preview string for selected address
     if (!app->isConnected()) {
-        s_source_preview = TR("not_connected");
+        s_source_preview = TR(app->isLiteBuild() ? "lite_no_wallet_short" : "not_connected");
     } else if (s_selected_from_idx >= 0 &&
                s_selected_from_idx < (int)state.addresses.size()) {
         const auto& addr = state.addresses[s_selected_from_idx];
@@ -890,7 +890,7 @@ static void RenderActionButtons(App* app, float width, float vScale,
 
     if (!can_send && ImGui::IsItemHovered(ImGuiHoveredFlags_AllowWhenDisabled)) {
         if (!app->isConnected())
-            ImGui::SetTooltip("%s", TR("send_tooltip_not_connected"));
+            ImGui::SetTooltip("%s", TR(app->isLiteBuild() ? "lite_no_wallet_short" : "send_tooltip_not_connected"));
         else if (state.sync.syncing)
             ImGui::SetTooltip("%s", TR("send_tooltip_syncing"));
         else if (s_from_address[0] == '\0')