Bolt: optimize input mapping lookup time complexity

[georgi]

What

Refactored InputMappingSelector.tsx to precompute a Map of previousNodes using useMemo for O(1) lookups inside the properties.map loop.

Why

Previously, inside the properties.map() iteration (size N), an O(M) previousNodes.find(...) lookup was performed. This resulted in an $O(M \times N)$ time complexity. This inefficiency scales poorly and causes unnecessary UI thread overhead when dealing with numerous properties or long chains.

Impact

Time complexity is reduced from $O(M \times N)$ to $O(N + M)$. The previousNodes are looped over exactly once in useMemo to build the Map, allowing O(1) lookups for each property mapping.

Verification

• Applied the code patch successfully.
• Ran tests natively (cd web && npm run test) and all tests passed (no regressions).
• Ran linter natively (cd web && npx oxlint src) and there were 0 new warnings/errors.

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PR created automatically by Jules for task 16949777695451353028 started by @georgi

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[georgi]

The optimization itself is correct — precomputing the previousNodesMap via useMemo for O(1) lookups is a good improvement.

However, this PR ships a .orig backup file that should not be committed:

• web/src/components/chain_editor/InputMappingSelector.tsx.orig — this is a 288-line copy of the original file, likely left by a merge tool or editor. Please remove it before merging.

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