Mark internal node_ref and node_mut as unsafe functions

[sile]

Fix #7

[Copilot]

Pull Request Overview

This PR refactors the node_ref and node_mut methods to be marked as unsafe, requiring callers to explicitly acknowledge the unsafe operation when accessing nodes by index. Previously, these methods were safe wrappers around unsafe operations, which could lead to incorrect usage if indices are out of bounds.

Key changes:

• Mark node_ref and node_mut as unsafe fn to make the safety requirements explicit
• Add unsafe blocks at all call sites throughout the codebase
• Refactor some complex pointer dereferencing code for clarity

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
src/tree_core.rs	Changed node_ref and node_mut signatures to unsafe fn and updated all internal call sites with unsafe blocks
src/vec_like.rs	Updated calls to node_ref and node_mut to use unsafe blocks

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