refactor(gui): improve caching flow, deterministic execution context, and GUI item cleanup

[tickwarden]

Summary

This PR improves GUI stability, caching consistency, and execution determinism. It introduces centralized GUI item cleanup, placeholder item support, and enhanced menu interaction features.

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Changes

Execution Context

• Replaced generic player execution with deterministic player targeting
• Preserves position, rotation, and anchor context during execution

GUI Caching

• Refactored item holder caching flow
• Improved toggle button cache consistency

GUI Item Lifecycle

• Added centralized GUI item cleanup function
• Introduced placeholder GUI item support

Menu Interaction

• Added automatic menu close on item selection with command execution support
  • Example: Selecting an item can close the menu and execute commands (e.g. /tp @a 0 100 0)
• Implemented conditional entity spawning tied to held items
  • Example: Holding a specific item spawns a minecart; releasing it removes the minecart
• Added support for multiple commands per interaction

Structure

• Removed duplicated inline cleanup logic
• Improved internal modularity

Metadata

• Updated pack format compatibility configuration

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Why

These changes improve:

• Multiplayer reliability
• GUI execution predictability
• Internal maintainability
• Item lifecycle consistency
• Interaction flexibility and responsiveness

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Risk Assessment

Low to Medium risk

Affected behavioral areas:

• GUI caching flow
• Item cleanup handling
• Execution context logic
• Automatic menu close behavior
• Entity spawning/despawning tied to item state

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Testing

Tested scenarios:

• Singleplayer GUI interaction
• Multiplayer concurrent GUI usage
• Cache persistence between menu switches
• GUI item cleanup cases
• Placeholder item handling
• Menu close on selection with command execution
• Item-based entity spawn/despawn behavior

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Notes

• Centralized cleanup prevents GUI items from remaining in player inventories after interaction cycles
• Automatic menu close enables smoother GUI-to-gameplay transitions
• Item-based entity spawning enables dynamic held-item interactions

[tickwarden]

Changes look reasonable. The switch to sort-arbitrary,limit=1 for deterministic execution is a good improvement. Minor: worth adding a comment explaining why sort-arbitrary is used here for future reference.