Fix block placement desync and sneak-interact handling

[ClexaGod]

This PR addresses two interaction bugs:

• Ghost blocks / placement desync: Some clients don’t reliably send START_ITEM_USE_ON, so
  gating ITEM_USE_CLICK_BLOCK by isUsingItemOnBlock() skips server‑side placement. Fix:
  process ITEM_USE_CLICK_BLOCK directly.
• Sneak + container while flying: Sneak state wasn’t updated when only explicit auth flags
  were sent. Fix: derive sneaking from explicit flags (SNEAKING, SNEAK_DOWN,
  SNEAK_TOGGLE_DOWN, PERSIST_SNEAK) and only fall back to START/STOP events if needed.

Tests

• Mobile placement persists after respawn
• Flying + shift doesn’t open containers, places blocks
• Normal interaction still opens containers

[codecov]

Codecov Report

❌ Patch coverage is 0% with 10 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...or/ingame/InventoryTransactionPacketProcessor.java	0.00%	10 Missing ⚠️

Files with missing lines	Coverage Δ	Complexity Δ
...ocessor/ingame/PlayerAuthInputPacketProcessor.java	0.00% <ø> (ø)	0.00 <0.00> (ø)
...or/ingame/InventoryTransactionPacketProcessor.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)

... and 98 files with indirect coverage changes

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[smartcmd]

I don't like this solution very much, it's too hacky. I think I'll investigate this issue further

[ClexaGod]

There's a big problem with placing blocks on mobile devices. I sent you a video about it. This solution solves the problem for now.

[smartcmd]

Would be great if you can move sneak state changes to another PR c:

[ClexaGod]

@smartcmd done. Block deletion issue fixed in Bedrock mobile clients