fix(decoupling-caps): add deterministic row layout

[obmakesomething]

/claim #15

Summary

• Add a focused fast path for partitionType === "decoupling_caps" in SingleInnerPartitionPackingSolver so decoupling-cap partitions bypass the generic packer.
• Place caps in a deterministic centered row using natural chip-id ordering and decouplingCapsGap ?? chipGap edge spacing.
• Respect fixed availableRotations and compute row width from the rotated footprint so forced-90-degree caps are spaced correctly.
• Preserve the existing PackSolver2 path for non-decoupling partitions.

Dependency note

• Add a direct circuit-to-svg dependency floor so the current test suite can resolve the schematic simulation SVG export used by @tscircuit/schematic-viewer during fresh CI installs.

Tests

• bun test — 22 pass, 1 skip, 0 fail
• bun test tests/PackInnerPartitionsSolver/SingleInnerPartitionPackingSolver.test.ts
• bun test tests/LayoutPipelineSolver/RP2040Circuit.test.ts
• bun run format:check
• bun run build
• git diff --check

No UI demo video is attached because this PR changes solver layout logic, not a UI surface.

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