feature: hud (#37)

* build: replace FetchContent with direct includes for glm

* build(deps): replace SOIL2 with stb for image and vorbis decoding

* build: replace FetchContent with direct includes for toml++

* refactor(texture): bump block texture size to 512 and disable items tab

* feat: add hotbar system with ItemStack and RowLayout

* fix(ui): restrict Ctrl key handling to typing mode

* feat(ui): add widget border support and highlight selected hotbar slot

* fix(ui): update borders on scale change and correct Image width

- Added update_border() calls in set_scale() for Button, ChatBox, Image, Label, and TextField.
- Fixed Image::width() to multiply by width instead of height.
- Added early return in Widget::update_border() if border is not supported.

* feat(ui): add border visual feedback on slider drag

* feat(ui): add ItemSlot widget and refactor hotbar to use it

* feat(world_scene): add inventory UI and pause type enum

* feat(ui): add item slot tooltip and make window size static

* fix(ui label): account for background offset in width/height

* refactor(ui): centralize item info label in inventory and add update

* feat(ui): add hotbar interaction in inventory UI

* fix(inventory-ui): correct row creation logic for first item

The loop starting at index 0 created a new row on the first iteration
(i % 10 == 0). Shift the loop to start at 1 and adjust modulus condition
to create rows correctly every 10 items.

* feat(block): add name_key for localized block names

Add `name_key` field to all block TOML definitions, enabling per-block localization. Update `BlockData` struct and `BlockManager` with `local_name()` method that returns a localized string via the translation system. Add corresponding entries to `en_US.json` and `zh_CN.json`. Modify inventory UI to use the localized name when displaying block info, and fix a bug where emptying a hotbar slot did not clear the item locally.

* fix(ui): change inventory item slot color from white to gray

* fix(ui): add missing include for std::array

include/glm/ext/scalar_reciprocal.hpp

@@ -0,0 +1,135 @@
+/// @ref ext_scalar_reciprocal
+/// @file glm/ext/scalar_reciprocal.hpp
+///
+/// @see core (dependence)
+///
+/// @defgroup ext_scalar_reciprocal GLM_EXT_scalar_reciprocal
+/// @ingroup ext
+///
+/// Include <glm/ext/scalar_reciprocal.hpp> to use the features of this extension.
+///
+/// Define secant, cosecant and cotangent functions.
+
+#pragma once
+
+// Dependencies
+#include "../detail/setup.hpp"
+
+#if GLM_MESSAGES == GLM_ENABLE && !defined(GLM_EXT_INCLUDED)
+#	pragma message("GLM: GLM_EXT_scalar_reciprocal extension included")
+#endif
+
+namespace glm
+{
+	/// @addtogroup ext_scalar_reciprocal
+	/// @{
+
+	/// Secant function.
+	/// hypotenuse / adjacent or 1 / cos(x)
+	///
+	/// @tparam genType Floating-point scalar or vector types.
+	///
+	/// @see ext_scalar_reciprocal
+	template<typename genType>
+	GLM_FUNC_DECL genType sec(genType angle);
+
+	/// Cosecant function.
+	/// hypotenuse / opposite or 1 / sin(x)
+	///
+	/// @tparam genType Floating-point scalar or vector types.
+	///
+	/// @see ext_scalar_reciprocal
+	template<typename genType>
+	GLM_FUNC_DECL genType csc(genType angle);
+
+	/// Cotangent function.
+	/// adjacent / opposite or 1 / tan(x)
+	///
+	/// @tparam genType Floating-point scalar or vector types.
+	///
+	/// @see ext_scalar_reciprocal
+	template<typename genType>
+	GLM_FUNC_DECL genType cot(genType angle);
+
+	/// Inverse secant function.
+	///
+	/// @return Return an angle expressed in radians.
+	/// @tparam genType Floating-point scalar or vector types.
+	///
+	/// @see ext_scalar_reciprocal
+	template<typename genType>
+	GLM_FUNC_DECL genType asec(genType x);
+
+	/// Inverse cosecant function.
+	///
+	/// @return Return an angle expressed in radians.
+	/// @tparam genType Floating-point scalar or vector types.
+	///
+	/// @see ext_scalar_reciprocal
+	template<typename genType>
+	GLM_FUNC_DECL genType acsc(genType x);
+
+	/// Inverse cotangent function.
+	///
+	/// @return Return an angle expressed in radians.
+	/// @tparam genType Floating-point scalar or vector types.
+	///
+	/// @see ext_scalar_reciprocal
+	template<typename genType>
+	GLM_FUNC_DECL genType acot(genType x);
+
+	/// Secant hyperbolic function.
+	///
+	/// @tparam genType Floating-point scalar or vector types.
+	///
+	/// @see ext_scalar_reciprocal
+	template<typename genType>
+	GLM_FUNC_DECL genType sech(genType angle);
+
+	/// Cosecant hyperbolic function.
+	///
+	/// @tparam genType Floating-point scalar or vector types.
+	///
+	/// @see ext_scalar_reciprocal
+	template<typename genType>
+	GLM_FUNC_DECL genType csch(genType angle);
+
+	/// Cotangent hyperbolic function.
+	///
+	/// @tparam genType Floating-point scalar or vector types.
+	///
+	/// @see ext_scalar_reciprocal
+	template<typename genType>
+	GLM_FUNC_DECL genType coth(genType angle);
+
+	/// Inverse secant hyperbolic function.
+	///
+	/// @return Return an angle expressed in radians.
+	/// @tparam genType Floating-point scalar or vector types.
+	///
+	/// @see ext_scalar_reciprocal
+	template<typename genType>
+	GLM_FUNC_DECL genType asech(genType x);
+
+	/// Inverse cosecant hyperbolic function.
+	///
+	/// @return Return an angle expressed in radians.
+	/// @tparam genType Floating-point scalar or vector types.
+	///
+	/// @see ext_scalar_reciprocal
+	template<typename genType>
+	GLM_FUNC_DECL genType acsch(genType x);
+
+	/// Inverse cotangent hyperbolic function.
+	///
+	/// @return Return an angle expressed in radians.
+	/// @tparam genType Floating-point scalar or vector types.
+	///
+	/// @see ext_scalar_reciprocal
+	template<typename genType>
+	GLM_FUNC_DECL genType acoth(genType x);
+
+	/// @}
+}//namespace glm
+
+#include "scalar_reciprocal.inl"