imaging: load Send-PxeStatus at script scope + bump QR size to 160px

Monitor-IntuneProgress.ps1: the previous Ensure-SendPxeStatus function
ran '. $lib' from inside the function body. PowerShell's dot-source-
inside-function semantics put the imported Send-PxeStatus into the
function's LOCAL scope, not the script scope. By the time Get-Phase1
called Get-Command Send-PxeStatus, the function had already returned
and Send-PxeStatus was out of scope - silently never invoked, no log
entry at all (success or failure). Diagnostic confirmed: bay had
DeviceId in dsregcmd, manual Send-PxeStatus from operator prompt
fired idx=7 cleanly with QR rendered, but Monitor's automatic call
never showed up in C:\Logs\send-pxe-status.log.

Fix: dot-source at script top-level (outside any function). Then
Send-PxeStatus is in script scope where every function in the file
can call it. Keep Ensure-SendPxeStatus as a no-op stub for any caller
still invoking it.

imaging.html: bump QR data-qr-size from 56 to 160 px. A 36-char UUID
at ECC M needs ~29x29 modules; at 56px each module was ~1.5px which
is too tight for a phone camera to lock onto from typical distance.
160 px gives ~5 px/module which scans cleanly.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

playbook/shopfloor-setup/Shopfloor/lib/Monitor-IntuneProgress.ps1

@@ -188,16 +188,18 @@ $script:cache = @{
     DeviceIdReported      = $false
 }
 
-# Lazy-load Send-PxeStatus so the dashboard can render a QR of the Intune
-# device GUID as soon as it's captured. Dot-source path mirrors the helper
-# usage in the 09-Setup-*.ps1 scripts.
-$script:sendPxeStatusLoaded = $false
+# Load Send-PxeStatus at SCRIPT scope (not inside a function). A dot-source
+# inside a function defines the imported function in that function's local
+# scope only, so callers from other functions can't see it and Get-Command
+# Send-PxeStatus returns nothing. Loading at the top of the script puts
+# Send-PxeStatus in script scope where every function can find it.
+$pxeStatusLib = Join-Path $PSScriptRoot 'Send-PxeStatus.ps1'
+if (Test-Path $pxeStatusLib) {
+    try { . $pxeStatusLib } catch { Write-Warning "Send-PxeStatus dot-source failed: $_" }
+}
 function Ensure-SendPxeStatus {
-    if ($script:sendPxeStatusLoaded) { return }
-    $lib = Join-Path $PSScriptRoot 'Send-PxeStatus.ps1'
-    if (Test-Path $lib) {
-        try { . $lib; $script:sendPxeStatusLoaded = $true } catch { }
-    }
+    # Kept as a no-op shim for any callers that still invoke it. Real load
+    # happens at script init above.
 }
 
 function Get-Phase1 {