refactor(BlockPlacer): handle position and callback correctly

[MukjepScarlet]

No description provided.

[liquidbounce-support-bot]

Thanks for the PR!

One thing this touches outside the code: the shared Block Placer docs still describe ConstructFailResult as falling back to a constructed center-hit, which no longer matches the new behaviour of using the point selected by target finding. Worth a small update in the Documentation repo — see Shared: Block Placer.

Also note that raytraceTarget no longer forces the target's direction onto the hit result and now returns early when the silent slot switch fails, so both are worth a look during review for the modules using the placer (Surround, HoleFiller, CrystalAura, ...).

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