Replace the old `Text` class with a new component-based UI system consisting of `Widget` and `Label` classes. Key changes:
- Remove `Text` class and its GPU upload logic; introduce `Label` as a `Widget` subclass with dirty-flag vertex update.
- Add `UIVertexData` struct to manage per-label vertex buffer/array and memory.
- Refactor `DebugCollector` to store labels in a `Widget` tree, removing hash-based lookup.
- Simplify `Font::vertices()` signature by removing position/scale parameters; scaling is now applied in the renderer’s model matrix.
- Update `Renderer` with `render_label()` and move UI rendering to a `render_ui()` that renders the widget tree.
- Add new source files `label.cpp`, `widget.cpp`, `ui_vertex_data.cpp` and update CMakeLists.
* refactor(config): replace singleton with dependency injection
* refactor(client_player): return ChunkPosSet by value in non-const getter
Copy the internal set under the mutex lock to avoid exposing a mutable reference that could be used unsafely after the lock is released. This fixes a potential data race when the caller holds the returned reference beyond the critical section. Also update the caller in `client_world` to remove the now-unnecessary `std::move`.
* fix(gameplay): prevent use-after-free in pending delete queues during destruction
* refactor(config): separate game and server configuration with explicit paths
* refactor(render): move render files to subdirectory, add RAII vertex buffer/array classes
* refactor(render): encapsulate OpenGL textures into Texture class
* refactor(texture): encapsulate textures with unique_ptr and bind methods
Replace raw GLuint framebuffer textures with std::unique_ptr<Texture>. Update TextureManager to return const Texture* instead of GLuint. Use Texture::bind() for active texture binding. Add RGBA16F and RGB formats. Add texture parameter methods. Update destructors accordingly.
* refactor(render): use Texture, VertexBuffer, VertexArray classes
* feat(render): add FrameBuffer class to encapsulate framebuffer operations
* refactor(render): extract world rendering into WorldRenderer class
* refactor(render): rename projection and model matrix members for clarity
* chore(render): remove unused matrix members
* fix(texture-manager): correct delet_texture typo and add null checks for textures
