Widen main window, add all Outlook security registry keys, add hint

- Main window wider (830px) so all buttons fit without resizing
- Set ALL Outlook Object Model Guard registry values (not just 3)
- Clean removal: delete entire Security subkey when disabling
- Add hint in settings that Outlook restart is needed

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/StarfaceOutlookSync/UI/MainForm.cs

@@ -76,8 +76,8 @@ namespace StarfaceOutlookSync.UI
         private void InitializeComponent()
         {
             Text = "Starface Kontakt-Sync";
-            Size = new Size(620, 450);
-            MinimumSize = new Size(500, 350);
+            Size = new Size(830, 450);
+            MinimumSize = new Size(830, 350);
             StartPosition = FormStartPosition.CenterScreen;
             Font = new Font("Segoe UI", 9);
             Icon = AppIcon.GetIcon();