fix(hub): Explore page says nothing about public groups when they're off

When the hub has public groups disabled, /explore showed an empty "Public
Groups" screen with a search box and a Create button that do nothing. It now
renders a single line — "This hub does not have public groups." — and the
server already returns an empty directory regardless.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018gKJ85aZyvEwarXMFzFEwi

11 files changed, 20 insertions, 2 deletions

diff --git a/packages/meshbay-hub/src/meshbay_hub/static/app.js b/packages/meshbay-hub/src/meshbay_hub/static/app.js
index a380033..9164a4d 100644
--- a/packages/meshbay-hub/src/meshbay_hub/static/app.js
+++ b/packages/meshbay-hub/src/meshbay_hub/static/app.js
@@ -629,7 +629,7 @@ function HomePage({ groups, notifications, onMarkRead, onPurge }) {
 
 // ── Explore Page ─────────────────────────────────────────────────────────────
 
-function ExplorePage({ token, myGroupIds }) {
+function ExplorePage({ token, myGroupIds, allowPublicGroups = true }) {
   const [groups, setGroups] = useState([]);
   const [loading, setLoading] = useState(true);
   const [search, setSearch] = useState('');
@@ -671,6 +671,13 @@ function ExplorePage({ token, myGroupIds }) {
 
   const isMember = (gid) => myGroupIds && myGroupIds.includes(gid);
 
+  // The hub can switch public groups off instance-wide (the server already
+  // returns nothing here). Say so plainly rather than showing an empty
+  // "Public groups" screen — nothing on this page has anything to do.
+  if (!allowPublicGroups) {
+    return html`<div><p class="page-message">${t('explore.disabled')}</p></div>`;
+  }
+
   return html`
     <div>
       <div style="display:flex;align-items:center;justify-content:space-between;margin-bottom:16px">
@@ -3270,7 +3277,8 @@ function App() {
     page = html`<${SearchPage} />`;
   } else if (route === '/explore') {
     page = html`<${ExplorePage} token=${user.token}
-      myGroupIds=${groups.map(g => g.id)} />`;
+      myGroupIds=${groups.map(g => g.id)}
+      allowPublicGroups=${allowPublicGroups} />`;
   } else if (route === '/create-group') {
     page = html`<${CreateGroupPage} token=${user.token} username=${user.username}
       allowPublicGroups=${allowPublicGroups}
diff --git a/packages/meshbay-hub/src/meshbay_hub/static/locales/de.js b/packages/meshbay-hub/src/meshbay_hub/static/locales/de.js
index dae16a1..f8daa16 100644
--- a/packages/meshbay-hub/src/meshbay_hub/static/locales/de.js
+++ b/packages/meshbay-hub/src/meshbay_hub/static/locales/de.js
@@ -71,6 +71,7 @@ export default {
   'explore.create_group': 'Gruppe erstellen',
   'explore.join': 'Beitreten',
   'explore.member': 'Beigetreten',
+  'explore.disabled': "This hub does not have public groups.",
 
   // Group page
   'group.default_name': 'Gruppe',
diff --git a/packages/meshbay-hub/src/meshbay_hub/static/locales/en.js b/packages/meshbay-hub/src/meshbay_hub/static/locales/en.js
index 6f12810..7cb3769 100644
--- a/packages/meshbay-hub/src/meshbay_hub/static/locales/en.js
+++ b/packages/meshbay-hub/src/meshbay_hub/static/locales/en.js
@@ -72,6 +72,7 @@ export default {
   'explore.create_group': 'Create group',
   'explore.join': 'Join',
   'explore.member': 'Joined',
+  'explore.disabled': "This hub does not have public groups.",
 
   // Group page
   'group.default_name': 'Group',
diff --git a/packages/meshbay-hub/src/meshbay_hub/static/locales/es.js b/packages/meshbay-hub/src/meshbay_hub/static/locales/es.js
index 0e51ede..ba64ee0 100644
--- a/packages/meshbay-hub/src/meshbay_hub/static/locales/es.js
+++ b/packages/meshbay-hub/src/meshbay_hub/static/locales/es.js
@@ -69,6 +69,7 @@ export default {
   'explore.create_group': 'Crear un grupo',
   'explore.join': 'Unirse',
   'explore.member': 'Miembro',
+  'explore.disabled': "This hub does not have public groups.",
 
   // Group page
   'group.default_name': 'Grupo',
diff --git a/packages/meshbay-hub/src/meshbay_hub/static/locales/fr.js b/packages/meshbay-hub/src/meshbay_hub/static/locales/fr.js
index ccfc709..60e56c9 100644
--- a/packages/meshbay-hub/src/meshbay_hub/static/locales/fr.js
+++ b/packages/meshbay-hub/src/meshbay_hub/static/locales/fr.js
@@ -70,6 +70,7 @@ export default {
   'explore.create_group': 'Créer un groupe',
   'explore.join': 'Rejoindre',
   'explore.member': 'Membre',
+  'explore.disabled': "Ce hub n'a pas de groupes publics.",
 
   // Group page
   'group.default_name': 'Groupe',
diff --git a/packages/meshbay-hub/src/meshbay_hub/static/locales/it.js b/packages/meshbay-hub/src/meshbay_hub/static/locales/it.js
index 1220090..ccf54ed 100644
--- a/packages/meshbay-hub/src/meshbay_hub/static/locales/it.js
+++ b/packages/meshbay-hub/src/meshbay_hub/static/locales/it.js
@@ -70,6 +70,7 @@ export default {
   'explore.create_group': 'Crea un gruppo',
   'explore.join': 'Partecipa',
   'explore.member': 'Iscritto',
+  'explore.disabled': "This hub does not have public groups.",
 
   // Group page
   'group.default_name': 'Gruppo',
diff --git a/packages/meshbay-hub/src/meshbay_hub/static/locales/ja.js b/packages/meshbay-hub/src/meshbay_hub/static/locales/ja.js
index f80f5d7..2ea90cb 100644
--- a/packages/meshbay-hub/src/meshbay_hub/static/locales/ja.js
+++ b/packages/meshbay-hub/src/meshbay_hub/static/locales/ja.js
@@ -68,6 +68,7 @@ export default {
   'explore.create_group': 'グループを作成',
   'explore.join': '参加',
   'explore.member': '参加済み',
+  'explore.disabled': "This hub does not have public groups.",
 
   // Group page
   'group.default_name': 'グループ',
diff --git a/packages/meshbay-hub/src/meshbay_hub/static/locales/nl.js b/packages/meshbay-hub/src/meshbay_hub/static/locales/nl.js
index ddd62c2..4b7ff12 100644
--- a/packages/meshbay-hub/src/meshbay_hub/static/locales/nl.js
+++ b/packages/meshbay-hub/src/meshbay_hub/static/locales/nl.js
@@ -71,6 +71,7 @@ export default {
   'explore.create_group': 'Groep aanmaken',
   'explore.join': 'Deelnemen',
   'explore.member': 'Lid',
+  'explore.disabled': "This hub does not have public groups.",
 
   // Group page
   'group.default_name': 'Groep',
diff --git a/packages/meshbay-hub/src/meshbay_hub/static/locales/pl.js b/packages/meshbay-hub/src/meshbay_hub/static/locales/pl.js
index c4a3c32..611c412 100644
--- a/packages/meshbay-hub/src/meshbay_hub/static/locales/pl.js
+++ b/packages/meshbay-hub/src/meshbay_hub/static/locales/pl.js
@@ -75,6 +75,7 @@ export default {
   'explore.create_group': 'Utwórz grupę',
   'explore.join': 'Dołącz',
   'explore.member': 'Należy',
+  'explore.disabled': "This hub does not have public groups.",
 
   // Group page
   'group.default_name': 'Grupa',
diff --git a/packages/meshbay-hub/src/meshbay_hub/static/locales/pt-BR.js b/packages/meshbay-hub/src/meshbay_hub/static/locales/pt-BR.js
index 868ad30..74e5047 100644
--- a/packages/meshbay-hub/src/meshbay_hub/static/locales/pt-BR.js
+++ b/packages/meshbay-hub/src/meshbay_hub/static/locales/pt-BR.js
@@ -71,6 +71,7 @@ export default {
   'explore.create_group': 'Criar um grupo',
   'explore.join': 'Participar',
   'explore.member': 'Participando',
+  'explore.disabled': "This hub does not have public groups.",
 
   // Group page
   'group.default_name': 'Grupo',
diff --git a/packages/meshbay-hub/src/meshbay_hub/static/locales/zh-CN.js b/packages/meshbay-hub/src/meshbay_hub/static/locales/zh-CN.js
index f019130..d2e6b48 100644
--- a/packages/meshbay-hub/src/meshbay_hub/static/locales/zh-CN.js
+++ b/packages/meshbay-hub/src/meshbay_hub/static/locales/zh-CN.js
@@ -68,6 +68,7 @@ export default {
   'explore.create_group': '创建群组',
   'explore.join': '加入',
   'explore.member': '已加入',
+  'explore.disabled': "This hub does not have public groups.",
 
   // Group page
   'group.default_name': '群组',