LSP integration steps 1-4, part of 5.

lsp/TerminalDiagnosticDisplay.h

@@ -0,0 +1,35 @@
+/*
+ * TerminalDiagnosticDisplay.h - Terminal (ncurses) diagnostics visualization stub
+ */
+#ifndef KTE_LSP_TERMINAL_DIAGNOSTIC_DISPLAY_H
+#define KTE_LSP_TERMINAL_DIAGNOSTIC_DISPLAY_H
+
+#include <string>
+#include <vector>
+
+#include "DiagnosticDisplay.h"
+
+class TerminalRenderer; // fwd
+
+namespace kte::lsp {
+class TerminalDiagnosticDisplay final : public DiagnosticDisplay {
+public:
+	explicit TerminalDiagnosticDisplay(TerminalRenderer *renderer);
+
+	void updateDiagnostics(const std::string &uri,
+	                       const std::vector<Diagnostic> &diagnostics) override;
+
+	void showInlineDiagnostic(const Diagnostic &diagnostic) override;
+
+	void showDiagnosticList(const std::vector<Diagnostic> &diagnostics) override;
+
+	void hideDiagnosticList() override;
+
+	void updateStatusBar(int errorCount, int warningCount) override;
+
+private:
+	[[maybe_unused]] TerminalRenderer *renderer_{}; // non-owning
+};
+} // namespace kte::lsp
+
+#endif // KTE_LSP_TERMINAL_DIAGNOSTIC_DISPLAY_H