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/CMakeLists.txt

@@ -0,0 +1,69 @@
+file(GLOB ROOT_SOURCE *.cpp)
+file(GLOB ROOT_INLINE *.inl)
+file(GLOB ROOT_HEADER *.hpp)
+file(GLOB ROOT_TEXT ../*.txt)
+file(GLOB ROOT_MD ../*.md)
+file(GLOB ROOT_NAT ../util/glm.natvis)
+
+file(GLOB_RECURSE CORE_SOURCE ./detail/*.cpp)
+file(GLOB_RECURSE CORE_INLINE ./detail/*.inl)
+file(GLOB_RECURSE CORE_HEADER ./detail/*.hpp)
+
+file(GLOB_RECURSE EXT_SOURCE ./ext/*.cpp)
+file(GLOB_RECURSE EXT_INLINE ./ext/*.inl)
+file(GLOB_RECURSE EXT_HEADER ./ext/*.hpp)
+
+file(GLOB_RECURSE GTC_SOURCE ./gtc/*.cpp)
+file(GLOB_RECURSE GTC_INLINE ./gtc/*.inl)
+file(GLOB_RECURSE GTC_HEADER ./gtc/*.hpp)
+
+file(GLOB_RECURSE GTX_SOURCE ./gtx/*.cpp)
+file(GLOB_RECURSE GTX_INLINE ./gtx/*.inl)
+file(GLOB_RECURSE GTX_HEADER ./gtx/*.hpp)
+
+file(GLOB_RECURSE SIMD_SOURCE ./simd/*.cpp)
+file(GLOB_RECURSE SIMD_INLINE ./simd/*.inl)
+file(GLOB_RECURSE SIMD_HEADER ./simd/*.h)
+
+source_group("Text Files" FILES ${ROOT_TEXT} ${ROOT_MD})
+source_group("Core Files" FILES ${CORE_SOURCE})
+source_group("Core Files" FILES ${CORE_INLINE})
+source_group("Core Files" FILES ${CORE_HEADER})
+source_group("EXT Files" FILES ${EXT_SOURCE})
+source_group("EXT Files" FILES ${EXT_INLINE})
+source_group("EXT Files" FILES ${EXT_HEADER})
+source_group("GTC Files" FILES ${GTC_SOURCE})
+source_group("GTC Files" FILES ${GTC_INLINE})
+source_group("GTC Files" FILES ${GTC_HEADER})
+source_group("GTX Files" FILES ${GTX_SOURCE})
+source_group("GTX Files" FILES ${GTX_INLINE})
+source_group("GTX Files" FILES ${GTX_HEADER})
+source_group("SIMD Files" FILES ${SIMD_SOURCE})
+source_group("SIMD Files" FILES ${SIMD_INLINE})
+source_group("SIMD Files" FILES ${SIMD_HEADER})
+
+add_library(glm-header-only INTERFACE)
+add_library(glm::glm-header-only ALIAS glm-header-only)
+
+target_include_directories(glm-header-only INTERFACE
+	"$<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}>"
+	"$<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>"
+)
+
+if (GLM_BUILD_LIBRARY)
+	add_library(glm
+		${ROOT_TEXT}      ${ROOT_MD}        ${ROOT_NAT}
+		${ROOT_SOURCE}    ${ROOT_INLINE}    ${ROOT_HEADER}
+		${CORE_SOURCE}    ${CORE_INLINE}    ${CORE_HEADER}
+		${EXT_SOURCE}     ${EXT_INLINE}     ${EXT_HEADER}
+		${GTC_SOURCE}     ${GTC_INLINE}     ${GTC_HEADER}
+		${GTX_SOURCE}     ${GTX_INLINE}     ${GTX_HEADER}
+		${SIMD_SOURCE}    ${SIMD_INLINE}    ${SIMD_HEADER}
+	)
+	add_library(glm::glm ALIAS glm)
+	target_link_libraries(glm PUBLIC glm-header-only)
+else()
+	add_library(glm INTERFACE)
+	add_library(glm::glm ALIAS glm)
+	target_link_libraries(glm INTERFACE glm-header-only)
+endif()