v4.1: two screen-reader fixes — silent start-in-tray, announce on restore

- Starting straight into the tray (StartMinimised / --minimized) no longer plays the "minimise"
  cue; only a genuine user minimise does (the startup path passes playCue:false)
- Restoring the window from the tray now lands focus on a real named control on the active tab so
  NVDA announces it, instead of resting on the role-less QuietTabControl and surfacing silently
- Shared the focus-a-leaf-for-announcement helper between the main window and Preferences

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/RemSound.App/MainForm.cs

@@ -606,6 +606,16 @@ public sealed class MainForm : Form
         {
             if (InvokeRequired) { BeginInvoke(new Action(RestoreFromTray)); return; }
             trayController.Restore();
+            // Land focus on a real, named control on whichever tab is showing, so NVDA announces
+            // something when the window comes back from the tray. Without this, focus rests on the
+            // QuietTabControl (deliberately role-less / nameless) and a screen reader has nothing to
+            // read, so the window surfaces silently — the same issue the Preferences dialog had.
+            // Deferred so it runs after the show/foreground settles.
+            BeginInvoke(new Action(() =>
+            {
+                if (IsDisposed) return;
+                WinEventNotifier.AnnounceByFocusingLeaf(this, mainTabControl.SelectedTab, mainTabControl);
+            }));
         }
         catch { /* best-effort — surfacing the window is a convenience, not load-critical */ }
     }
@@ -1265,7 +1275,9 @@ public sealed class MainForm : Form
             startNextInstanceMinimized = false;
             if (minimizeThisInstance)
             {
-                BeginInvoke(() => trayController.Minimize());
+                // playCue:false — starting up in the tray (StartMinimised / --minimized) isn't the
+                // user choosing to minimise, so it must not sound the "minimise" cue.
+                BeginInvoke(() => trayController.Minimize(playCue: false));
             }
 
             // Kick off UPnP discovery if the user has the box ticked. Off by default; the