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/quaternion_geometric.hpp

@@ -0,0 +1,70 @@
+/// @ref ext_quaternion_geometric
+/// @file glm/ext/quaternion_geometric.hpp
+///
+/// @defgroup ext_quaternion_geometric GLM_EXT_quaternion_geometric
+/// @ingroup ext
+///
+/// Provides geometric functions for quaternion types
+///
+/// Include <glm/ext/quaternion_geometric.hpp> to use the features of this extension.
+///
+/// @see core_func_geometric
+/// @see ext_quaternion_float
+/// @see ext_quaternion_double
+
+#pragma once
+
+// Dependency:
+#include "../geometric.hpp"
+#include "../exponential.hpp"
+#include "../ext/vector_relational.hpp"
+
+#if GLM_MESSAGES == GLM_ENABLE && !defined(GLM_EXT_INCLUDED)
+#	pragma message("GLM: GLM_EXT_quaternion_geometric extension included")
+#endif
+
+namespace glm
+{
+	/// @addtogroup ext_quaternion_geometric
+	/// @{
+
+	/// Returns the norm of a quaternions
+	///
+	/// @tparam T Floating-point scalar types
+	/// @tparam Q Value from qualifier enum
+	///
+	/// @see ext_quaternion_geometric
+	template<typename T, qualifier Q>
+	GLM_FUNC_DECL T length(qua<T, Q> const& q);
+
+	/// Returns the normalized quaternion.
+	///
+	/// @tparam T Floating-point scalar types
+	/// @tparam Q Value from qualifier enum
+	///
+	/// @see ext_quaternion_geometric
+	template<typename T, qualifier Q>
+	GLM_FUNC_DECL GLM_CONSTEXPR qua<T, Q> normalize(qua<T, Q> const& q);
+
+	/// Returns dot product of q1 and q2, i.e., q1[0] * q2[0] + q1[1] * q2[1] + ...
+	///
+	/// @tparam T Floating-point scalar types.
+	/// @tparam Q Value from qualifier enum
+	///
+	/// @see ext_quaternion_geometric
+	template<typename T, qualifier Q>
+	GLM_FUNC_DECL GLM_CONSTEXPR T dot(qua<T, Q> const& x, qua<T, Q> const& y);
+
+	/// Compute a cross product.
+	///
+	/// @tparam T Floating-point scalar types
+	/// @tparam Q Value from qualifier enum
+	///
+	/// @see ext_quaternion_geometric
+	template<typename T, qualifier Q>
+	GLM_FUNC_QUALIFIER GLM_CONSTEXPR qua<T, Q> cross(qua<T, Q> const& q1, qua<T, Q> const& q2);
+
+	/// @}
+} //namespace glm
+
+#include "quaternion_geometric.inl"