initial commit for native-only neovim plugin configuration

lua/config/diagnostic.lua

@@ -1,6 +1,6 @@
-
 --[[
 
+
 ⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢀⣠⣴⣾⣷⣦⣄⡀
 ⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢀⣠⣴⣾⣿⣿⣿⣿⣿⣿⣿⣿⣷⣦⣄⡀
 ⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢀⣠⣴⣾⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣷⣦⣄⡀
@@ -26,22 +26,23 @@
             |  _/ /_____\__ \ || (_| | (__|   <
             |_|/___|    |___/\__\__,_|\___|_|\_\
 
-                Neovim 0.12 configuration
-                  (c) Frank Zechert 2026
+                Neovim v0.12 configuration
+                  (C) Frank Zechert 2026
 ]]
 
 vim.diagnostic.config({
-	update_in_insert = false,
+	update_in_insert = true,
 	severity_sort = true,
 	float = {
-		border = vim.g.ui.border,
+		border = vim.g.ui.popupborder,
 		source = true,
 	},
 	underline = true,
+	-- underline only from a specified severity level
 	-- underline = { severity = { min = vim.diagnostic.severity.WARN } },
 	virtual_text = {
 		prefix = vim.g.ui.symbols.diagnostic.virtual_text_prefix,
-		severity = nil, -- show all severity
+		severity = nil, -- show all severities
 		spacing = 2, -- extra spacing between text and code
 		virt_text_pos = "eol",
 		source = "if_many",
@@ -53,19 +54,19 @@ vim.diagnostic.config({
 				INFO = vim.g.ui.symbols.diagnostic.sign_info,
 				HINT = vim.g.ui.symbols.diagnostic.sign_hint,
 			}
-			return string.format("%s", diagnostic.message)
+			return string.format("%s: %s", symbols[severity], diagnostic.message)
 		end,
-
 	},
 	virtual_lines = false,
 	jump = {
+		-- when jumping to a diagnostic message, automatically open the diagnostic float
 		on_jump = function(_, bufnr)
 			vim.diagnostic.open_float({
 				bufnr = bufnr,
-				scope = 'cursor',
+				scope = "cursor",
 				focus = false
 			})
-		end,
+		end
 	},
 	signs = {
 		-- icons in sign column