fix(updates): harden Sparkle release metadata

.gitignore

@@ -2,7 +2,23 @@
 .build/
 build/
 dist/
+*.dmg
 DerivedData/
 .vscode/
 *.xcuserdata/
 *.xcuserstate
+
+# Local secrets and exported signing keys
+.env
+.env.*
+*.key
+*.pem
+*.p8
+*.p12
+*.cer
+*.der
+*.mobileprovision
+sparkle_private_key*
+SparklePrivateKey*
+private-key*
+private_key*

Sources/Firelink/FirelinkApp.swift

@@ -15,10 +15,16 @@ final class SparkleUpdater: NSObject, ObservableObject, SPUUpdaterDelegate {
     }
     
     func checkForUpdates() {
+        guard controller.updater.canCheckForUpdates else {
+            isChecking = false
+            updateStatus = "Update check is already in progress."
+            return
+        }
+
         isChecking = true
         updateStatus = "Checking for updates..."
         foundUpdateItem = nil
-        controller.updater.checkForUpdatesInBackground()
+        controller.checkForUpdates(nil)
     }
 
     func updater(_ updater: SPUUpdater, didFindValidUpdate item: SUAppcastItem) {
@@ -48,6 +54,12 @@ final class SparkleUpdater: NSObject, ObservableObject, SPUUpdaterDelegate {
             self.updateStatus = "Update check failed: \(error.localizedDescription)"
         }
     }
+
+    func updater(_ updater: SPUUpdater, didFinishUpdateCycleFor updateCheck: SPUUpdateCheck, error: Error?) {
+        DispatchQueue.main.async {
+            self.isChecking = false
+        }
+    }
 }
 
 @main

appcast.xml

@@ -8,10 +8,11 @@
     <item>
       <title>Version 0.5.7</title>
       <sparkle:minimumSystemVersion>14.0</sparkle:minimumSystemVersion>
+      <sparkle:hardwareRequirements>arm64</sparkle:hardwareRequirements>
       <sparkle:releaseNotesLink>https://github.com/nimbold/Firelink/releases/tag/v0.5.7</sparkle:releaseNotesLink>
       <pubDate>Sat, 06 Jun 2026 11:36:06 +0000</pubDate>
       <enclosure url="https://github.com/nimbold/Firelink/releases/download/v0.5.7/Firelink-0.5.7-mac-arm64.dmg"
-                 sparkle:version="0.5.7"
+                 sparkle:version="22"
                  sparkle:shortVersionString="0.5.7"
                  length="8871979"
                  type="application/octet-stream"