fix(layered): align differently sized blocks by center

[SimbiozizV]

Summary by Sourcery

Align layered graph nodes and connection routes by block centers across variable sizes while preserving existing layout behavior.

New Features:

• Align layered layouts and routed edges by the centers of differently sized blocks.
• Add a variable-size layered layout Storybook example.

Bug Fixes:

• Correct spacing and alignment calculations for nodes with varying dimensions while preserving standard-node geometry.

Enhancements:

• Support separate virtual-node width and height defaults, while retaining the legacy virtual-node size option for compatibility.
• Clarify layered layout spacing option semantics for inter-column and intra-column gaps.

Tests:

• Add layout and integration coverage for center alignment, variable node gaps, wide layers, custom virtual-node sizes, and unchanged standard geometry.

[sourcery-ai]

Reviewer's Guide

The PR makes layered layouts dimension-aware: node alignment, intra-layer spacing, inter-layer clearance, and returned coordinates now account for variable block sizes, while edge routing uses separate virtual-node dimensions. It adds regression and integration tests plus a Storybook example and corrected option documentation.

File-Level Changes

Change	Details	Files
Update the layered layout algorithm to account for each node’s actual dimensions when aligning and spacing nodes.	Calculate vertical separation from the two nodes’ half-heights plus the configured gap. Align alternative coordinate systems using top and bottom bounds rather than raw center coordinates. Preserve horizontal clearance after wide layers and retain standard-node geometry. Normalize returned node positions so the layout’s coordinates remain compatible with block top-left positions.	src/plugins/layered/layout.ts src/plugins/layered/layout.test.ts
Route edge endpoints through correctly dimensioned virtual-node centers.	Accept separate virtual-node width and height values while retaining the deprecated square-size fallback. Pass configured default dimensions from the layout hook to the converter. Add integration coverage for differently sized blocks and custom virtual-node defaults.	src/plugins/layered/converters/layeredConverter.ts src/plugins/layered/hooks/useLayeredLayout.ts src/plugins/layered/hooks/useLayeredLayout.integration.test.ts
Add a variable-size layered graph example and update option documentation.	Provide a Storybook configuration and story containing varied node dimensions and merges. Correct descriptions of horizontal and vertical gap semantics to match the implementation. Update the story component to render arbitrary layout configurations and use complete effect dependencies.	src/stories/plugins/layered/config.ts src/stories/plugins/layered/layered.stories.tsx src/plugins/layered/types/index.ts

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[sourcery-ai]

Hey - I've reviewed your changes and they look great!

Sourcery assessment

Approved.

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