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/detail/compute_common.hpp

@@ -0,0 +1,50 @@
+#pragma once
+
+#include "setup.hpp"
+#include <limits>
+
+namespace glm{
+namespace detail
+{
+	template<typename genFIType, bool /*signed*/>
+	struct compute_abs
+	{};
+
+	template<typename genFIType>
+	struct compute_abs<genFIType, true>
+	{
+		GLM_FUNC_QUALIFIER GLM_CONSTEXPR static genFIType call(genFIType x)
+		{
+			GLM_STATIC_ASSERT(
+				std::numeric_limits<genFIType>::is_iec559 || GLM_CONFIG_UNRESTRICTED_FLOAT || std::numeric_limits<genFIType>::is_signed,
+				"'abs' only accept floating-point and integer scalar or vector inputs");
+
+			return x >= genFIType(0) ? x : -x;
+			// TODO, perf comp with: *(((int *) &x) + 1) &= 0x7fffffff;
+		}
+	};
+
+#if (GLM_COMPILER & GLM_COMPILER_CUDA) || (GLM_COMPILER & GLM_COMPILER_HIP)
+	template<>
+	struct compute_abs<float, true>
+	{
+		GLM_FUNC_QUALIFIER static float call(float x)
+		{
+			return fabsf(x);
+		}
+	};
+#endif
+
+	template<typename genFIType>
+	struct compute_abs<genFIType, false>
+	{
+		GLM_FUNC_QUALIFIER GLM_CONSTEXPR static genFIType call(genFIType x)
+		{
+			GLM_STATIC_ASSERT(
+				(!std::numeric_limits<genFIType>::is_signed && std::numeric_limits<genFIType>::is_integer),
+				"'abs' only accept floating-point and integer scalar or vector inputs");
+			return x;
+		}
+	};
+}//namespace detail
+}//namespace glm