fix(update): check for updates one minute after startup

The first background check waited the full 30-minute interval, so
sessions shorter than that never checked or downloaded an update.

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

OpenNest/UpdaterService.cs

@@ -25,6 +25,9 @@ namespace OpenNest
     /// </remarks>
     public sealed class UpdaterService : IDisposable
     {
+        // Short first delay: most sessions are far shorter than the interval and
+        // would otherwise never check; the delay keeps the check off startup.
+        private static readonly TimeSpan FirstCheckDelay = TimeSpan.FromMinutes(1);
         private static readonly TimeSpan CheckInterval = TimeSpan.FromMinutes(30);
         private const string GitHubRepositoryUrl = "https://github.com/ajisaacs/OpenNest";
 
@@ -103,7 +106,7 @@ namespace OpenNest
             if (_manager is null || !_manager.IsInstalled)
                 return;
 
-            _timer = new Timer(_ => _ = TickAsync(), null, CheckInterval, CheckInterval);
+            _timer = new Timer(_ => _ = TickAsync(), null, FirstCheckDelay, CheckInterval);
         }
 
         /// <summary>Applies the downloaded update and restarts the process. Call only after the user agrees.</summary>

docs/auto-update.md

@@ -2,7 +2,7 @@
 
 The Windows desktop app (`OpenNest.exe`) can self-update via
 [Velopack](https://velopack.io): `OpenNest.UpdaterService` checks its update
-source 30 minutes after startup and every 30 minutes after that, and downloads
+source one minute after startup and every 30 minutes after that, and downloads
 a newer release in the background. Once a download finishes, a clickable
 status-bar item offers to restart into it; nothing restarts without that
 confirmation, so an open, unsaved nest is never discarded automatically.
@@ -11,7 +11,7 @@ A download the user does not restart for is applied the next time OpenNest
 starts: `VelopackApp.Build().Run()` in `MainApp` keeps Velopack's default
 `SetAutoApplyOnStartup(true)`, so launching after a download opens the new
 version. Nothing runs while OpenNest is closed (no service or scheduled task),
-and a session shorter than the first 30 minutes never checks.
+and a session shorter than the first minute never checks.
 
 **Help > Check for Updates** runs the same check immediately (waiting for a
 background check already in progress rather than starting a second one) and