Add window-level progress indicator for Run Tweaks and Undo (#4830)

* feat(tweaks): add window-level progress indicator for Run Tweaks and Undo

* Hide completed tweaks progress on next action

---------

Co-authored-by: Chris Titus <contact@christitus.com>

functions/private/Set-WinUtilTweaksProgressIndicator.ps1

@@ -0,0 +1,35 @@
+function Set-WinUtilTweaksProgressIndicator {
+    <#
+    .SYNOPSIS
+        Shows, updates, or hides the window-level progress indicator used by the
+        Tweaks and Undo workflows. It lives outside the TabControl, so unlike the
+        Install tab's progress bar it stays visible no matter which tab is active.
+    .PARAMETER Visible
+        Whether the indicator should be shown or hidden.
+    .PARAMETER Label
+        The text to display above the progress bar.
+    .PARAMETER Percent
+        The percentage of the progress bar that should be filled (0-100).
+    #>
+    param(
+        [bool]$Visible,
+        [string]$Label,
+        [ValidateRange(0,100)]
+        [int]$Percent
+    )
+
+    $indicatorVisible = if ($Visible) { [Windows.Visibility]::Visible } else { [Windows.Visibility]::Collapsed }
+    $indicatorLabel = $Label
+    $hasLabel = $PSBoundParameters.ContainsKey('Label')
+    $hasPercent = $PSBoundParameters.ContainsKey('Percent')
+
+    Invoke-WPFUIThread -ScriptBlock {
+        $sync.WPFTweaksProgressBar.Visibility = $indicatorVisible
+        if ($hasLabel) {
+            $sync.WPFTweaksProgressLabel.Text = $indicatorLabel
+        }
+        if ($hasPercent) {
+            $sync.WPFTweaksProgressValue.Value = $Percent
+        }
+    }
+}