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/gtc/matrix_transform.hpp

@@ -0,0 +1,36 @@
+/// @ref gtc_matrix_transform
+/// @file glm/gtc/matrix_transform.hpp
+///
+/// @see core (dependence)
+/// @see gtx_transform
+/// @see gtx_transform2
+///
+/// @defgroup gtc_matrix_transform GLM_GTC_matrix_transform
+/// @ingroup gtc
+///
+/// Include <glm/gtc/matrix_transform.hpp> to use the features of this extension.
+///
+/// Defines functions that generate common transformation matrices.
+///
+/// The matrices generated by this extension use standard OpenGL fixed-function
+/// conventions. For example, the lookAt function generates a transform from world
+/// space into the specific eye space that the projective matrix functions
+/// (perspective, ortho, etc) are designed to expect. The OpenGL compatibility
+/// specifications defines the particular layout of this eye space.
+
+#pragma once
+
+// Dependencies
+#include "../mat4x4.hpp"
+#include "../vec2.hpp"
+#include "../vec3.hpp"
+#include "../vec4.hpp"
+#include "../ext/matrix_projection.hpp"
+#include "../ext/matrix_clip_space.hpp"
+#include "../ext/matrix_transform.hpp"
+
+#if GLM_MESSAGES == GLM_ENABLE && !defined(GLM_EXT_INCLUDED)
+#	pragma message("GLM: GLM_GTC_matrix_transform extension included")
+#endif
+
+#include "matrix_transform.inl"