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/constants.inl

@@ -0,0 +1,173 @@
+/// @ref gtc_constants
+
+namespace glm
+{
+	template<typename genType>
+	GLM_FUNC_QUALIFIER GLM_CONSTEXPR genType zero()
+	{
+		return genType(0);
+	}
+
+	template<typename genType>
+	GLM_FUNC_QUALIFIER GLM_CONSTEXPR genType one()
+	{
+		return genType(1);
+	}
+
+	template<typename genType>
+	GLM_FUNC_QUALIFIER GLM_CONSTEXPR genType two_pi()
+	{
+		return genType(6.28318530717958647692528676655900576);
+	}
+
+	template<typename genType>
+	GLM_FUNC_QUALIFIER GLM_CONSTEXPR genType tau()
+	{
+		return two_pi<genType>();
+	}
+
+	template<typename genType>
+	GLM_FUNC_QUALIFIER GLM_CONSTEXPR genType root_pi()
+	{
+		return genType(1.772453850905516027);
+	}
+
+	template<typename genType>
+	GLM_FUNC_QUALIFIER GLM_CONSTEXPR genType half_pi()
+	{
+		return genType(1.57079632679489661923132169163975144);
+	}
+
+	template<typename genType>
+	GLM_FUNC_QUALIFIER GLM_CONSTEXPR genType three_over_two_pi()
+	{
+		return genType(4.71238898038468985769396507491925432);
+	}
+
+	template<typename genType>
+	GLM_FUNC_QUALIFIER GLM_CONSTEXPR genType quarter_pi()
+	{
+		return genType(0.785398163397448309615660845819875721);
+	}
+
+	template<typename genType>
+	GLM_FUNC_QUALIFIER GLM_CONSTEXPR genType one_over_pi()
+	{
+		return genType(0.318309886183790671537767526745028724);
+	}
+
+	template<typename genType>
+	GLM_FUNC_QUALIFIER GLM_CONSTEXPR genType one_over_two_pi()
+	{
+		return genType(0.159154943091895335768883763372514362);
+	}
+
+	template<typename genType>
+	GLM_FUNC_QUALIFIER GLM_CONSTEXPR genType two_over_pi()
+	{
+		return genType(0.636619772367581343075535053490057448);
+	}
+
+	template<typename genType>
+	GLM_FUNC_QUALIFIER GLM_CONSTEXPR genType four_over_pi()
+	{
+		return genType(1.273239544735162686151070106980114898);
+	}
+
+	template<typename genType>
+	GLM_FUNC_QUALIFIER GLM_CONSTEXPR genType two_over_root_pi()
+	{
+		return genType(1.12837916709551257389615890312154517);
+	}
+
+	template<typename genType>
+	GLM_FUNC_QUALIFIER GLM_CONSTEXPR genType one_over_root_two()
+	{
+		return genType(0.707106781186547524400844362104849039);
+	}
+
+	template<typename genType>
+	GLM_FUNC_QUALIFIER GLM_CONSTEXPR genType root_half_pi()
+	{
+		return genType(1.253314137315500251);
+	}
+
+	template<typename genType>
+	GLM_FUNC_QUALIFIER GLM_CONSTEXPR genType root_two_pi()
+	{
+		return genType(2.506628274631000502);
+	}
+
+	template<typename genType>
+	GLM_FUNC_QUALIFIER GLM_CONSTEXPR genType root_ln_four()
+	{
+		return genType(1.17741002251547469);
+	}
+
+	template<typename genType>
+	GLM_FUNC_QUALIFIER GLM_CONSTEXPR genType e()
+	{
+		return genType(2.71828182845904523536);
+	}
+
+	template<typename genType>
+	GLM_FUNC_QUALIFIER GLM_CONSTEXPR genType euler()
+	{
+		return genType(0.577215664901532860606);
+	}
+
+	template<typename genType>
+	GLM_FUNC_QUALIFIER GLM_CONSTEXPR genType root_two()
+	{
+		return genType(1.41421356237309504880168872420969808);
+	}
+
+	template<typename genType>
+	GLM_FUNC_QUALIFIER GLM_CONSTEXPR genType root_three()
+	{
+		return genType(1.73205080756887729352744634150587236);
+	}
+
+	template<typename genType>
+	GLM_FUNC_QUALIFIER GLM_CONSTEXPR genType root_five()
+	{
+		return genType(2.23606797749978969640917366873127623);
+	}
+
+	template<typename genType>
+	GLM_FUNC_QUALIFIER GLM_CONSTEXPR genType ln_two()
+	{
+		return genType(0.693147180559945309417232121458176568);
+	}
+
+	template<typename genType>
+	GLM_FUNC_QUALIFIER GLM_CONSTEXPR genType ln_ten()
+	{
+		return genType(2.30258509299404568401799145468436421);
+	}
+
+	template<typename genType>
+	GLM_FUNC_QUALIFIER GLM_CONSTEXPR genType ln_ln_two()
+	{
+		return genType(-0.3665129205816643);
+	}
+
+	template<typename genType>
+	GLM_FUNC_QUALIFIER GLM_CONSTEXPR genType third()
+	{
+		return genType(0.3333333333333333333333333333333333333333);
+	}
+
+	template<typename genType>
+	GLM_FUNC_QUALIFIER GLM_CONSTEXPR genType two_thirds()
+	{
+		return genType(0.666666666666666666666666666666666666667);
+	}
+
+	template<typename genType>
+	GLM_FUNC_QUALIFIER GLM_CONSTEXPR genType golden_ratio()
+	{
+		return genType(1.61803398874989484820458683436563811);
+	}
+
+} //namespace glm