perf(ui): stop forcing full wallet re-scans on restore and peers refresh

Restoring or un-maximizing the window called refreshNow(), which wipes
the history-scan progress and re-scans every z-address (a
z_listreceivedbyaddress per address, each holding cs_main). The Peers
tab's refresh button did the same, and holding F5 auto-repeated it.

- Window restore no longer forces a refresh; the regular timers catch
  up (skipping the daemon-output backlog stays).
- The Peers refresh button refreshes peers only.
- F5 ignores key repeat. An explicit F5 or History refresh still does
  the full re-scan.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/ui/windows/peers_tab.cpp

@@ -587,8 +587,9 @@ void RenderPeersTab(App* app)
                 ImGui::PushID("##peersRefresh");
                 if (ImGui::InvisibleButton("##btn", ImVec2(btnW, btnH))) {
                     if (!isRefreshing) {
+                        // Peers only: refreshNow() also forced a full wallet re-scan (every z-address)
+                        // for a button that says "Refresh peer list".
                         app->refreshPeerInfo();
-                        app->refreshNow();
                     }
                 }
                 if (ImGui::IsItemHovered()) {