Modern C++ style practices

Apply modern C++ features and consistent syntax patterns to improve code readability and safety. Follow these guidelines:

1. Use modern C++ features:
   • Prefer structured bindings for tuple unpacking: ```cpp // Instead of: for (const auto& tuple : glyphsToUpload) { const auto& texHandle = std::get<0>(tuple); const auto& glyph = std::get<1>(tuple); }

// Use: for (auto [texHandle, glyph, fontStack] : glyphsToUpload) { // … }

2. Use safe casting practices:
- Prefer static_cast over C-style casts:
```cpp
// Instead of:
auto i = (mbgl::style::PluginLayer::Impl*)baseImpl.get();

// Use:
auto i = static_cast<mbgl::style::PluginLayer::Impl*>(baseImpl.get());

1. Maintain consistent syntax:
   • Always use braces for multi-line conditionals
   • Always initialize variables, even if immediately set
   • Use default comparison operators where possible in C++20: ```cpp // Instead of: bool operator==(const TileEntry& other) const noexcept { return id == other.id && sourceID == other.sourceID && op == other.op; }

// Use: bool operator==(const TileEntry& other) const = default; ```

These practices improve code safety, readability, and maintainability while leveraging modern C++ features.