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/main.cpp

@@ -1705,11 +1705,12 @@ int main(int argc, char* argv[])
                         lastKnownH = waitEvent.window.data2;
                     }
                 }
-                // Window restored from minimized — trigger immediate data refresh
+                // Window restored. No forced refresh: update() keeps running while minimized, so the data
+                // is current, and refreshNow() wiped the shielded-scan progress and re-scanned every
+                // z-address (SDL also sends RESTORED on un-maximize, so a title-bar double-click did it).
                 if (waitEvent.type == SDL_EVENT_WINDOW_RESTORED &&
                     waitEvent.window.windowID == SDL_GetWindowID(window)) {
                     app.skipDaemonOutputBacklog();   // drop the minimized-period backlog (avoids a spurious "rescan complete" toast)
-                    app.refreshNow();
                 }
                 // Handle DPI change that arrived while idle (same logic as poll loop)
                 if (waitEvent.type == SDL_EVENT_WINDOW_DISPLAY_SCALE_CHANGED &&
@@ -1852,11 +1853,10 @@ int main(int argc, char* argv[])
                     }
                 }
             }
-            // Window restored from minimized — trigger immediate data refresh
+            // Window restored: no forced refresh (see the wait branch above).
             if (event.type == SDL_EVENT_WINDOW_RESTORED &&
                 event.window.windowID == SDL_GetWindowID(window)) {
                 app.skipDaemonOutputBacklog();   // drop the minimized-period backlog (avoids a spurious "rescan complete" toast)
-                app.refreshNow();
             }
             // Handle DPI/display scale changes (e.g. window dragged to a
             // different-DPI monitor, or user changes Windows scaling)