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/receive_tab.cpp

@@ -190,7 +190,7 @@ static void RenderAddressDropdown(App* app, float width) {
 
     // Build preview string
     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_address_idx >= 0 &&
                s_selected_address_idx < (int)state.addresses.size()) {
         const auto& addr = state.addresses[s_selected_address_idx];
@@ -509,7 +509,7 @@ void RenderReceiveTab(App* app)
         DrawGlassPanel(dl, emptyMin, emptyMax, glassSpec);
         dl->AddText(sub1, sub1->LegacySize,
             ImVec2(emptyMin.x + Layout::spacingXl(), emptyMin.y + Layout::spacingXl()),
-            OnSurfaceDisabled(), TR("waiting_for_daemon"));
+            OnSurfaceDisabled(), TR(app->isLiteBuild() ? "lite_no_wallet" : "waiting_for_daemon"));
         dl->AddText(capFont, capFont->LegacySize,
             ImVec2(emptyMin.x + Layout::spacingXl(), emptyMin.y + Layout::spacingXl() + sub1->LegacySize + S.drawElement("tabs.receive", "empty-state-subtitle-gap").size),
             OnSurfaceDisabled(), TR("addresses_appear_here"));