fix(installer): Best-effort attempt to keep autostart settings on initial v2 migration

The v1 uninstaller tries to remove autostart entries, but the appdata
restore doesn't restore those entries. While restoring all is
infeasible, do a best effort to restore the autostart setting of the
current user performing the upgrade.

Author: GermanCoding

installer/common.iss

@@ -82,11 +82,67 @@ var
   OldUninstString    : string;
   OldInstallDir   : string;
   BackupDir       : string;
+  BackupAutostartValue: string;
+  BackupAutostartExists: Boolean;
 
   InfoPage : TWizardPage;
   PgLabel : TNewStaticText;
   PgCheckbox : TNewCheckBox;
 
+// -------------------------------------------------------------------
+// AUTOSTART REGISTRY BACKUP  ----------------------------------------
+// -------------------------------------------------------------------
+function BackupAutostartRegistry(): Boolean;
+var
+  RegValue: string;
+begin
+  Result := False;
+  BackupAutostartExists := False;
+  BackupAutostartValue := '';
+
+  if RegQueryStringValue(HKEY_CURRENT_USER, 'SOFTWARE\Microsoft\Windows\CurrentVersion\Run', 'SyncTrayzor', RegValue) then
+  begin
+    BackupAutostartExists := True;
+    BackupAutostartValue := RegValue;
+    Result := True;
+    Log('Backed up autostart registry: ' + RegValue);
+  end
+  else
+  begin
+    Log('No autostart registry entry found to backup');
+  end;
+end;
+
+procedure RestoreAutostartRegistry();
+var
+  NewValue: string;
+  HasMinimized: Boolean;
+begin
+  if not BackupAutostartExists then
+  begin
+    Log('No autostart registry to restore');
+    Exit;
+  end;
+
+  // Check if the old value contained -minimized
+  HasMinimized := Pos('-minimized', BackupAutostartValue) > 0;
+
+  // Build new registry value with current install path
+  NewValue := '"' + ExpandConstant('{app}\{#AppExeName}') + '"';
+  if HasMinimized then
+    NewValue := NewValue + ' -minimized';
+
+  // Write the new autostart registry entry
+  if RegWriteStringValue(HKEY_CURRENT_USER, 'SOFTWARE\Microsoft\Windows\CurrentVersion\Run', 'SyncTrayzor', NewValue) then
+  begin
+    Log('Restored autostart registry: ' + NewValue);
+  end
+  else
+  begin
+    Log('Failed to restore autostart registry');
+  end;
+end;
+
 procedure BumpInstallCount;
 var
   FileContents: AnsiString;
@@ -145,6 +201,8 @@ begin
   end
   else if CurStep = ssPostInstall then
   begin
+    if OldVersionDetected then
+      RestoreAutostartRegistry();
     ExeConfig := ExpandConstant('{param:SyncTrayzorExeConfig}');
     if ExeConfig <> '' then
     begin
@@ -367,7 +425,10 @@ begin
   begin
     // 1) Backup
     if not PgCheckbox.Checked then
+    begin
       BackupAppData();
+      BackupAutostartRegistry();
+    end;
 
     // 2) Run uninstaller
     if (Exec('>', OldUninstString, '', SW_SHOWNORMAL, ewWaitUntilTerminated, ResultCode)) then
@@ -379,8 +440,8 @@ begin
     else
     begin
       MsgBox('Could not launch the previous uninstaller (' +
-             OldUninstString + '): ' + SysErrorMessage(ResultCode) + '.'#13#10'Setup cannot continue.',
-             mbError, MB_OK);
+            OldUninstString + '): ' + SysErrorMessage(ResultCode) + '.'#13#10'Setup cannot continue.',
+            mbError, MB_OK);
       Result := False;  // stay on page
     end;
   end;