Fix arrow render order so critical arrows appear on top#9
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Fix arrow render order so critical arrows appear on top#9
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What was wrong
Critical arrows in the PERT chart could be hidden behind non-critical arrows because SVG renders elements in DOM order. This made it hard to visually track critical paths.
What this fixes
Reorders links data so that non-critical arrows are rendered first, then critical arrows are rendered last. This ensures that critical arrows always appear on top in the SVG.
Screenshots
Before:

After:
