fix: resolve all remaining LuaLS diagnostics

runtime/lua/vim/lsp/diagnostic.lua

@@ -20,7 +20,7 @@ end
 ---@return lsp.DiagnosticSeverity
 local function severity_vim_to_lsp(severity)
   if type(severity) == 'string' then
-    severity = vim.diagnostic.severity[severity]
+    severity = vim.diagnostic.severity[severity] --- @type integer
   end
   return severity
 end
@@ -89,6 +89,7 @@ local function diagnostic_lsp_to_vim(diagnostics, bufnr, client_id)
         string.format('Unsupported Markup message from LSP client %d', client_id),
         vim.lsp.log_levels.ERROR
       )
+      --- @diagnostic disable-next-line: undefined-field,no-unknown
       message = diagnostic.message.value
     end
     local line = buf_lines and buf_lines[start.line + 1] or ''