Can't turn text fields in a table into a link [duplicate]

Question

I have a list of open opportunities that displays on the user profile. Here's the .cmp and the controller. The issue isn't in the js

<aura:component controller="MyOpenOpportunitiesController" implements="flexipage:availableForAllPageTypes,force:hasRecordId">
    <aura:attribute name="recordId" type="String" default="{!v.recordId}" />
    <aura:attribute name="Opportunities" type="Opportunity[]" />
    <aura:attribute name="columns" type="List" default="[
        {label: 'Opportunity name', fieldName: 'Name', type: 'text'},
        {label: 'Stage', fieldName: 'StageName', type: 'text'},
        {label: 'Account Name', fieldName: 'AccountName', type: 'text'}
    ]" />
    <aura:attribute name="cardTitle" type="String" />
    <aura:attribute name="user" type="User" /> <!-- Add this line -->
    <aura:handler name="init" value="{!this}" action="{!c.doInit}" />

    <lightning:card title="{!v.cardTitle}" iconName="standard:opportunity">
        <lightning:datatable data="{!v.Opportunities}" columns="{!v.columns}" keyField="Id" hideCheckboxColumn="true" />
    </lightning:card>
</aura:component>

Apex Controller

public with sharing class MyOpenOpportunitiesController {
    public class OpportunityWrapper {
        @AuraEnabled
        public Opportunity opp {get; set;}
        @AuraEnabled
        public String accountName {get; set;}

        public OpportunityWrapper(Opportunity opp, String accountName) {
            this.opp = opp;
            this.accountName = accountName;
        }
    }

    @AuraEnabled
    public static List<OpportunityWrapper> getOpenOpportunities(String recordId) {
        List<OpportunityWrapper> wrappers = new List<OpportunityWrapper>();
        if (recordId != null) {
            System.debug('Record ID: ' + recordId);
            List<Opportunity> opportunities = [SELECT Id, Name, StageName, Account.Name FROM Opportunity WHERE OwnerId = :recordId AND IsClosed = false];
            for (Opportunity opp : opportunities) {
                wrappers.add(new OpportunityWrapper(opp, opp.Account.Name));
            }
            System.debug('Number of opportunities fetched: ' + opportunities.size());
        } else {
            System.debug('Record ID is null');
        }
        return wrappers;
    }

    @AuraEnabled
    public static String getCurrentUserId() {
        return UserInfo.getUserId();
    }

    @AuraEnabled
    public static User getUser(String userId) {
        return [SELECT Name FROM User WHERE Id = :userId];
    }
}

I want to make the opp names into link to that opp. I adjusted the code below, but now it just displays blanks cells in the name column (along with a fully populated table everywhere else)

<aura:component controller="MyOpenOpportunitiesController" implements="flexipage:availableForAllPageTypes,force:hasRecordId">
    <aura:attribute name="recordId" type="String" default="{!v.recordId}" />
    <aura:attribute name="Opportunities" type="Object[]" />
    <aura:attribute name="columns" type="List" default="[
        {label: 'Opportunity name', fieldName: 'oppURL', type: 'url', typeAttributes: {label: { fieldName: 'opp.Name' }, target: '_blank'}},
        {label: 'Stage', fieldName: 'StageName', type: 'text'},
        {label: 'Account Name', fieldName: 'AccountName', type: 'text'}
    ]" />
    <aura:attribute name="cardTitle" type="String" />
    <aura:attribute name="user" type="User" /> <!-- Add this line -->
    <aura:handler name="init" value="{!this}" action="{!c.doInit}" />

    <lightning:card title="{!v.cardTitle}" iconName="standard:opportunity">
        <lightning:datatable data="{!v.Opportunities}" columns="{!v.columns}" keyField="Id" hideCheckboxColumn="true" />
    </lightning:card>
</aura:component>

Apex Controller

public with sharing class MyOpenOpportunitiesController {
    public class OpportunityWrapper {
        @AuraEnabled
        public Opportunity opp {get; set;}
        @AuraEnabled
        public String accountName {get; set;}
        @AuraEnabled
        public String oppURL {get; set;}
        @AuraEnabled
        public String accountURL {get; set;}


        public OpportunityWrapper(Opportunity opp, String accountName) {
            this.opp = opp;
            this.accountName = accountName;
            this.oppURL = '/' + opp.Id;
            this.accountURL = '/' + opp.AccountId;
        }
    }

    @AuraEnabled
    public static List<OpportunityWrapper> getOpenOpportunities(String recordId) {
        List<OpportunityWrapper> wrappers = new List<OpportunityWrapper>();
        if (recordId != null) {
            System.debug('Record ID: ' + recordId);
            List<Opportunity> opportunities = [SELECT Id, Name, StageName, Account.Name, AccountId FROM Opportunity WHERE OwnerId = :recordId AND IsClosed = false];
            for (Opportunity opp : opportunities) {
                wrappers.add(new OpportunityWrapper(opp, opp.Account.Name));
            }
            System.debug('Number of opportunities fetched: ' + opportunities.size());
        } else {
            System.debug('Record ID is null');
        }
        return wrappers;
    }

    @AuraEnabled
    public static String getCurrentUserId() {
        return UserInfo.getUserId();
    }

    @AuraEnabled
    public static User getUser(String userId) {
        return [SELECT Name FROM User WHERE Id = :userId];
    }
}