Fix tray health detection and harden backend service startup

install_backend_service.ps1

@@ -43,7 +43,38 @@ $publishDir = Join-Path $scriptDir "service_host\publish"
 $serviceExe = Join-Path $publishDir "ScreenJob.WindowsServiceHost.exe"
 $logDir = Join-Path $scriptDir "screenjob_runs\service"
 
+$existingService = Get-Service -Name $ServiceName -ErrorAction SilentlyContinue
+if ($null -ne $existingService) {
+    if (-not $ForceReinstall) {
+        throw "Service '$ServiceName' already exists. Re-run with -ForceReinstall to replace it."
+    }
+
+    if ($PSCmdlet.ShouldProcess($ServiceName, "Remove existing service")) {
+        if ($existingService.Status -ne "Stopped") {
+            Stop-Service -Name $ServiceName -Force -ErrorAction Stop
+        }
+
+        & sc.exe delete $ServiceName | Out-Null
+        if ($LASTEXITCODE -ne 0) {
+            throw "Failed to delete existing service '$ServiceName' (sc.exe exit code $LASTEXITCODE)."
+        }
+
+        $deadline = (Get-Date).AddSeconds(15)
+        while ((Get-Date) -lt $deadline) {
+            $stillThere = Get-Service -Name $ServiceName -ErrorAction SilentlyContinue
+            if ($null -eq $stillThere) {
+                break
+            }
+            Start-Sleep -Milliseconds 300
+        }
+    }
+}
+
 if ($PSCmdlet.ShouldProcess($projectFile, "Publish Windows service host")) {
+    if (Test-Path -LiteralPath $serviceExe) {
+        Remove-Item -LiteralPath $serviceExe -Force -ErrorAction SilentlyContinue
+    }
+
     & $dotnetCmd.Source publish `
         $projectFile `
         -c Release `
@@ -63,24 +94,6 @@ if (-not (Test-Path -LiteralPath $serviceExe)) {
 
 $binaryPath = "`"$serviceExe`" --backend-script `"$backendScript`" --working-dir `"$scriptDir`" --log-dir `"$logDir`""
 
-$existingService = Get-Service -Name $ServiceName -ErrorAction SilentlyContinue
-if ($null -ne $existingService) {
-    if (-not $ForceReinstall) {
-        throw "Service '$ServiceName' already exists. Re-run with -ForceReinstall to replace it."
-    }
-
-    if ($PSCmdlet.ShouldProcess($ServiceName, "Remove existing service")) {
-        if ($existingService.Status -ne "Stopped") {
-            Stop-Service -Name $ServiceName -Force -ErrorAction Stop
-        }
-
-        & sc.exe delete $ServiceName | Out-Null
-        if ($LASTEXITCODE -ne 0) {
-            throw "Failed to delete existing service '$ServiceName' (sc.exe exit code $LASTEXITCODE)."
-        }
-    }
-}
-
 if ($PSCmdlet.ShouldProcess($ServiceName, "Create service")) {
     New-Service `
         -Name $ServiceName `