Feat: add hover boxes and diagnostics from lsp

include/hover.h

@@ -0,0 +1,37 @@
+#ifndef HOVER_H
+#define HOVER_H
+
+#include "./pch.h"
+#include "./spans.h"
+#include "./ts_def.h"
+#include "./ui.h"
+#include "./utils.h"
+
+struct HoverBox {
+  std::string text;
+  std::atomic<bool> is_markup;
+  uint32_t scroll_;
+  std::vector<ScreenCell> cells;
+  uint32_t box_width;
+  uint32_t box_height;
+  std::vector<Highlight> highlights;
+  std::vector<Span> hover_spans;
+
+  void clear();
+  void scroll(int32_t number);
+  void render_first(bool scroll = false);
+  void render(Coord pos);
+};
+
+struct DiagnosticBox {
+  std::vector<VWarn> warnings;
+  std::vector<ScreenCell> cells;
+  uint32_t box_width;
+  uint32_t box_height;
+
+  void clear();
+  void render_first();
+  void render(Coord pos);
+};
+
+#endif