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/app.cpp

@@ -418,6 +418,9 @@ void App::update()
         // A wallet is open only after a successful backend init against the lite server, so this
         // is a non-blocking proxy for "lite backend operational".
         state_.connected = lite_wallet_->walletOpen();
+        // Suppress the status bar's full-node connection-detail line in lite ("" and "Connected"
+        // are both hidden); the connected/no-wallet indicator + sync status convey lite state.
+        connection_status_ = state_.connected ? "Connected" : "";
 
         wallet::LiteWalletAppRefreshModel liteModel;
         if (lite_wallet_->takeRefreshedModel(liteModel)) {
@@ -1551,7 +1554,8 @@ void App::renderStatusBar()
         ImGui::TextColored(ImVec4(0.8f, 0.2f, 0.2f, dotOpacity), ICON_MD_CIRCLE);
         ImGui::PopFont();
         ImGui::SameLine(0, sbIconTextGap);
-        ImGui::Text("%s", TR("disconnected"));
+        // Lite has no daemon connection; "disconnected" here means no wallet is open.
+        ImGui::Text("%s", TR(isLiteBuild() ? "lite_no_wallet_short" : "disconnected"));
     }
 
     // Block height
@@ -1622,7 +1626,8 @@ void App::renderStatusBar()
             ImGui::TextColored(ImVec4(1.0f, 0.8f, 0.0f, 1.0f), TR("sb_syncing_basic"), 
                               state_.sync.verification_progress * 100.0, blocksLeft);
         }
-    } else if (state_.connected) {
+    } else if (state_.connected && !isLiteBuild()) {
+        // Lite has no P2P peers (the lite server isn't a peer set); skip the peer count.
         ImGui::Text(TR("sb_peers"), state_.peers.size());
     }