fix: Strip module prefix correctly for Part tables in diagrams

[dimitri-yatsenko]

Summary

• Fix Part table names displaying with module prefix in diagrams (e.g., scan.Scans.Scan instead of Scans.Scan)

Problem

The previous logic used rsplit(".", 1) to strip module prefixes, which only split at the last dot. For Part tables with names like scan.Scans.Scan, this resulted in:

• prefix = "scan.Scans"
• Comparison with cluster label "scan" failed
• Display name kept full scan.Scans.Scan

Solution

Use startswith() to check if the name begins with the cluster label, then strip that prefix:

if cluster_label and name.startswith(cluster_label + "."):
    display_name = name[len(cluster_label) + 1:]

This correctly handles both regular tables (scan.Scans → Scans) and Part tables (scan.Scans.Scan → Scans.Scan).

Test plan

• Verified fix logic with debug output
• Test with lcms-demo pipeline diagrams

Fixes #1390

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