Link invite trace accounts to admin user profiles

frontend/app/admin/invites/page.tsx

@@ -1,6 +1,7 @@
 'use client'
 
 import InviteDeliveryChoice from '../../ui/InviteDeliveryChoice'
+import Link from 'next/link'
 
 import { useRouter } from 'next/navigation'
 import { useEffect, useMemo, useState } from 'react'
@@ -918,6 +919,14 @@ export default function AdminInviteManagementPage() {
     return invites
   }, [inviteView, invites])
 
+  const traceUserIds = useMemo(() => new Map(users.map(user => [user.username.trim().toLowerCase(), user.id])), [users])
+  const traceAccountLink = (username: string, className?: string) => {
+    const id = traceUserIds.get(username.trim().toLowerCase())
+    return id != null
+      ? <Link className={`invite-trace-account-link ${className || ''}`} href={`/users/${id}`} title={`Manage ${username}'s account`}>{username}</Link>
+      : <span className={className}>{username}</span>
+  }
+
   const inviteTraceRows = useMemo(() => {
     const inviteByCode = new Map<string, Invite>()
     invites.forEach((invite) => {
@@ -2276,14 +2285,14 @@ export default function AdminInviteManagementPage() {
                           >
                             <div className="invite-trace-node-main">
                               <div className="invite-trace-node-title">
-                                <span className="invite-trace-user">{row.username}</span>
+                                {traceAccountLink(row.username, 'invite-trace-user')}
                                 <span className={`small-pill ${row.role === 'admin' ? '' : 'is-muted'}`}>{row.role}</span>
                                 <span className="small-pill">{row.authProvider}</span>
                                 {row.isCycle && <span className="small-pill is-muted">cycle</span>}
                               </div>
                               <p className={`invite-trace-node-arrow ${isInviteTraceRowInvited(row) ? '' : 'is-root'}`}>
                                 {row.inviterUsername
-                                  ? `\u2190 Invited by ${row.inviterUsername}`
+                                  ? <>← Invited by {traceAccountLink(row.inviterUsername)}</>
                                   : row.inviteCode
                                     ? `\u2190 Invited via code ${row.inviteCode}`
                                     : 'Direct/root account'}
@@ -2319,7 +2328,7 @@ export default function AdminInviteManagementPage() {
                     <div key={`${row.username}-${row.level}-${row.inviteCode || 'direct'}`} className="invite-trace-row">
                       <div className="invite-trace-row-main" style={{ paddingLeft: `${row.level * 18}px` }}>
                         <span className="invite-trace-branch" aria-hidden="true" />
-                        <span className="invite-trace-user">{row.username}</span>
+                        {traceAccountLink(row.username, 'invite-trace-user')}
                         <span className={`small-pill ${row.role === 'admin' ? '' : 'is-muted'}`}>{row.role}</span>
                         <span className="small-pill">{row.authProvider}</span>
                         {row.isCycle && <span className="small-pill is-muted">cycle</span>}
@@ -2327,7 +2336,7 @@ export default function AdminInviteManagementPage() {
                       <div className="invite-trace-row-meta">
                         <span className="invite-trace-meta-item">
                           <span className="label">Invited by</span>
-                          <strong>{row.inviterUsername || 'Root/direct'}</strong>
+                          <strong>{row.inviterUsername ? traceAccountLink(row.inviterUsername) : 'Root/direct'}</strong>
                         </span>
                         <span className="invite-trace-meta-item">
                           <span className="label">Via code</span>