Add deterministic row layout for decoupling cap partitions

[natanelia]

/claim #15

Summary

• bypass generic PackSolver2 for partitions marked partitionType === "decoupling_caps"
• place decoupling capacitors in a deterministic, centered natural-order row
• preserve decouplingCapsGap fallback behavior and account for fixed rotated capacitor widths
• add regression tests for row ordering, centering, spacing, and rotated dimensions
• lazy-load the LayoutPipelineSolver06 debugger UI so tests can import its fixture data without eagerly loading UI-only dependencies

Verification

• bun test
• bun test tests/PackInnerPartitionsSolver/SingleInnerPartitionPackingSolver.test.ts
• bun test tests/PackInnerPartitionsSolver/SingleInnerPartitionPackingSolver.test.ts tests/LayoutPipelineSolver/RP2040Circuit.test.ts tests/LayoutPipelineSolver/LayoutPipelineSolver03.test.tsx
• bun run format:check
• bun run build
• git diff --check

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