feat(sings): use new diagnostic configuration + improve UI

lua/config/plugins/lualine.lua

@@ -1,7 +1,5 @@
 local _colors = { "DiffAdd", "DiffChange", "RedrawDebugRecompose" }
 
-
-
 require("lualine").setup({
 	options = {
 		icons_enabled = true,
@@ -42,7 +40,31 @@ require("lualine").setup({
 				source = nil, -- A function that works as a data source for diff.
 			}
 		},
-		lualine_x = { 'encoding', 'filetype', 'diagnostics', 'lsp' },
+		lualine_x = { 'encoding', 'filetype',
+			{
+				'diagnostics',
+
+				sources = { 'nvim_diagnostic', 'coc' },
+
+				sections = { 'error', 'warn', 'info', 'hint' },
+
+				diagnostics_color = {
+					error = 'DiagnosticError', -- Changes diagnostics' error color.
+					warn  = 'DiagnosticWarn', -- Changes diagnostics' warn color.
+					info  = 'DiagnosticInfo', -- Changes diagnostics' info color.
+					hint  = 'DiagnosticHint', -- Changes diagnostics' hint color.
+				},
+				symbols = {
+					hint = '󰌵 ',
+					info = '󰬐 ',
+					warn = '󰀧 ',
+					error = '󰅗 ',
+				},
+				colored = true, -- Displays diagnostics status in color if set to true.
+				update_in_insert = false, -- Update diagnostics in insert mode.
+				always_visible = false, -- Show diagnostics even if there are none.
+			}
+		},
 		lualine_y = { 'progress' },
 		lualine_z = { 'location' }
 	},