Fix library selection index mismatch in RegenPreview.ps1 interactive mode

[Copilot]

When using RegenPreview.ps1 -Select, displayed library numbers didn't correlate to actual selections. Selecting index 62 would regenerate a different library than shown at position 62.

Root Cause

Libraries were displayed grouped by generator type (Azure SDK, Unbranded, Management Plane) with sequential numbering, but selection indexed into the original ungrouped array.

# Display showed:
[1-10]  Azure SDK Libraries
[11-20] Unbranded Libraries  
[21-75] Management Libraries

# But selection used original array order which could be:
# Mgmt, Azure, Unbranded, Mgmt, Azure, ... (interleaved)

Changes

• Reorder $Libraries array to match display order before user selection
• Replace all selection references from $Libraries to $orderedLibraries
• Ensure display index N maps to orderedLibraries[N-1]

6 lines modified, 11 lines added in Select-LibrariesToRegenerate function.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Number selection is inaccurate in RegenPreview</issue_title>
<issue_description>When running RegenPreview.ps1 -Select, the numbers displayed don't correlate to the actual library that is used.

Comments on the Issue (you are @copilot in this section)

• Fixes Number selection is inaccurate in RegenPreview #9324

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