fix: two waits with no deadline, resume positions per account, group settings tab

**Joining a group could hang.** Reported after a first attempt that never
finished and a later one that worked — the shape of a network wait with no
deadline, and there were two.

Signaling here is non-trickle: the offer is not sent until ICE gathering says
it is done. A STUN server that is slow, filtered, or resolved through a DNS that
is not answering means `icegatheringstatechange` never reaches `complete`, and
`connect()` never returns. Same shape as the fullscreen denial fixed yesterday:
a promise that never settles leaves no error to find. Gathering now has four
seconds, after which the offer goes out with what it has — host candidates are
already there, which is enough on a LAN, and giving up instead would turn a slow
STUN server into a refusal to connect.

The second: `hub:fetch` in the desktop client had no timeout, so a host that
accepts a connection and then says nothing holds the request for as long as the
OS allows. `hub:probe` had one; the handler that carries signaling did not. Now
thirty seconds — longer than the hub's own fifteen-second signaling wait, so it
cannot abort a call that was about to succeed — and it says the hub did not
answer rather than "fetch failed".

**Resume positions belonged to the machine, not the account.** Stored as
`mb:pos:<file>`, so a second account signing in on the same computer was offered
"resume where you left off" in a film it had never opened. Wrong on its own
terms, and a small disclosure of what the other person watches, since the offer
only appears for files someone has actually been through. The account is in the
key now. Positions written before this are deleted rather than re-keyed: there
is no record of whose they were, and guessing hands them to whoever signs in
next, which is the bug.

**The staggered rules in the members table.** `display: flex` on the actions
`<td>` — a flex table cell stops being a table cell, so it no longer stretches
to its row and its bottom border is drawn wherever its own content ends.
Measured: in a row whose other cells were `top 76, height 40`, that cell was
`top 77, height 30`, its rule nine pixels above the rest. It is a table cell
again, held open by a zero-width strut so the owner's row — which has no remove
button — stays as tall as the others. Every cell now shares its row's top and
bottom exactly, at 420px and 900px.

**Members became Settings.** It was a list with three unrelated forms stacked
above it, laid out with inline styles on whichever element needed them, and the
group's own controls somewhere else entirely — leaving or deleting a group sat
in the page header beside the title. Now one tab in sections: invitations,
operator pairing, your devices on this node, leaving or deleting, and the roster
last, since it is the only part with no upper bound.

One consequence worth stating: the tab bar no longer waits for the node.
Membership is hub-side, and gating it on a live connection would have made
"leave this group" unreachable exactly when a node is down — which is when
someone most wants it. Files and chat still need the node and say so.

**A download button in the viewer**, beside the close button and in the same
style, for both the video player and the file preview.

844 tests pass.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

10 files changed, 40 insertions, 0 deletions

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 e099edb..d222bba 100644
--- a/packages/meshbay-hub/src/meshbay_hub/static/locales/de.js
+++ b/packages/meshbay-hub/src/meshbay_hub/static/locales/de.js
@@ -77,6 +77,10 @@ export default {
   'group.tab_files': 'Dateien',
   'group.tab_chat': 'Chat',
   'group.tab_members': 'Mitglieder',
+  'group.tab_settings': "Einstellungen",
+  'members.danger_title': "Gefahrenbereich",
+  'members.danger_leave_hint': "Sie verlieren den Zugriff auf die Dateien und den Chat dieser Gruppe.",
+  'members.danger_delete_hint': "Die Gruppe verschwindet für alle Mitglieder. Das lässt sich nicht rückgängig machen.",
   'group.filter': 'Dateien filtern …',
   'group.col_name': 'Name',
   'group.col_size': 'Größe',
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 a621084..33e8f5e 100644
--- a/packages/meshbay-hub/src/meshbay_hub/static/locales/en.js
+++ b/packages/meshbay-hub/src/meshbay_hub/static/locales/en.js
@@ -78,6 +78,10 @@ export default {
   'group.tab_files': 'Files',
   'group.tab_chat': 'Chat',
   'group.tab_members': 'Members',
+  'group.tab_settings': "Settings",
+  'members.danger_title': "Danger zone",
+  'members.danger_leave_hint': "You will lose access to this group's files and chat.",
+  'members.danger_delete_hint': "This removes the group for every member. It cannot be undone.",
   'group.filter': 'Filter files...',
   'group.col_name': 'Name',
   'group.col_size': 'Size',
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 5fb4950..81b2c97 100644
--- a/packages/meshbay-hub/src/meshbay_hub/static/locales/es.js
+++ b/packages/meshbay-hub/src/meshbay_hub/static/locales/es.js
@@ -75,6 +75,10 @@ export default {
   'group.tab_files': 'Archivos',
   'group.tab_chat': 'Chat',
   'group.tab_members': 'Miembros',
+  'group.tab_settings': "Ajustes",
+  'members.danger_title': "Zona de riesgo",
+  'members.danger_leave_hint': "Perderá el acceso a los archivos y al chat de este grupo.",
+  'members.danger_delete_hint': "El grupo desaparece para todos sus miembros. No se puede deshacer.",
   'group.filter': 'Filtrar archivos...',
   'group.col_name': 'Nombre',
   'group.col_size': 'Tamaño',
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 c9480b6..e44b03b 100644
--- a/packages/meshbay-hub/src/meshbay_hub/static/locales/fr.js
+++ b/packages/meshbay-hub/src/meshbay_hub/static/locales/fr.js
@@ -76,6 +76,10 @@ export default {
   'group.tab_files': 'Fichiers',
   'group.tab_chat': 'Discussion',
   'group.tab_members': 'Membres',
+  'group.tab_settings': "Paramètres",
+  'members.danger_title': "Zone sensible",
+  'members.danger_leave_hint': "Vous perdrez l’accès aux fichiers et à la discussion de ce groupe.",
+  'members.danger_delete_hint': "Le groupe disparaît pour tous ses membres. C’est irréversible.",
   'group.filter': 'Filtrer les fichiers...',
   'group.col_name': 'Nom',
   'group.col_size': 'Taille',
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 ac7c06c..206c749 100644
--- a/packages/meshbay-hub/src/meshbay_hub/static/locales/it.js
+++ b/packages/meshbay-hub/src/meshbay_hub/static/locales/it.js
@@ -76,6 +76,10 @@ export default {
   'group.tab_files': 'File',
   'group.tab_chat': 'Chat',
   'group.tab_members': 'Membri',
+  'group.tab_settings': "Impostazioni",
+  'members.danger_title': "Zona critica",
+  'members.danger_leave_hint': "Perderai l’accesso ai file e alla chat di questo gruppo.",
+  'members.danger_delete_hint': "Il gruppo scompare per tutti i membri. Non è reversibile.",
   'group.filter': 'Filtra i file...',
   'group.col_name': 'Nome',
   'group.col_size': 'Dimensione',
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 b5d60ca..b4ccfaf 100644
--- a/packages/meshbay-hub/src/meshbay_hub/static/locales/ja.js
+++ b/packages/meshbay-hub/src/meshbay_hub/static/locales/ja.js
@@ -74,6 +74,10 @@ export default {
   'group.tab_files': 'ファイル',
   'group.tab_chat': 'チャット',
   'group.tab_members': 'メンバー',
+  'group.tab_settings': "設定",
+  'members.danger_title': "取り扱い注意",
+  'members.danger_leave_hint': "このグループのファイルとチャットにアクセスできなくなります。",
+  'members.danger_delete_hint': "グループはすべてのメンバーから消えます。元に戻せません。",
   'group.filter': 'ファイルを絞り込み…',
   'group.col_name': '名前',
   'group.col_size': 'サイズ',
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 304c90a..ac75f26 100644
--- a/packages/meshbay-hub/src/meshbay_hub/static/locales/nl.js
+++ b/packages/meshbay-hub/src/meshbay_hub/static/locales/nl.js
@@ -77,6 +77,10 @@ export default {
   'group.tab_files': 'Bestanden',
   'group.tab_chat': 'Chat',
   'group.tab_members': 'Leden',
+  'group.tab_settings': "Instellingen",
+  'members.danger_title': "Gevarenzone",
+  'members.danger_leave_hint': "U verliest de toegang tot de bestanden en de chat van deze groep.",
+  'members.danger_delete_hint': "De groep verdwijnt voor alle leden. Dit kan niet ongedaan worden gemaakt.",
   'group.filter': 'Bestanden filteren...',
   'group.col_name': 'Naam',
   'group.col_size': 'Grootte',
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 98f36ce..fe9c18d 100644
--- a/packages/meshbay-hub/src/meshbay_hub/static/locales/pl.js
+++ b/packages/meshbay-hub/src/meshbay_hub/static/locales/pl.js
@@ -81,6 +81,10 @@ export default {
   'group.tab_files': 'Pliki',
   'group.tab_chat': 'Czat',
   'group.tab_members': 'Członkowie',
+  'group.tab_settings': "Ustawienia",
+  'members.danger_title': "Strefa ryzyka",
+  'members.danger_leave_hint': "Utracisz dostęp do plików i czatu tej grupy.",
+  'members.danger_delete_hint': "Grupa zniknie dla wszystkich członków. Tego nie można cofnąć.",
   'group.filter': 'Filtruj pliki...',
   'group.col_name': 'Nazwa',
   'group.col_size': 'Rozmiar',
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 5db5cd5..270af8e 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
@@ -77,6 +77,10 @@ export default {
   'group.tab_files': 'Arquivos',
   'group.tab_chat': 'Conversa',
   'group.tab_members': 'Membros',
+  'group.tab_settings': "Configurações",
+  'members.danger_title': "Zona de risco",
+  'members.danger_leave_hint': "Você perderá o acesso aos arquivos e ao chat deste grupo.",
+  'members.danger_delete_hint': "O grupo desaparece para todos os membros. Não há como desfazer.",
   'group.filter': 'Filtrar arquivos...',
   'group.col_name': 'Nome',
   'group.col_size': 'Tamanho',
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 b5f16fb..6e19df9 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
@@ -74,6 +74,10 @@ export default {
   'group.tab_files': '文件',
   'group.tab_chat': '聊天',
   'group.tab_members': '成员',
+  'group.tab_settings': "设置",
+  'members.danger_title': "危险区域",
+  'members.danger_leave_hint': "您将无法再访问该群组的文件和聊天。",
+  'members.danger_delete_hint': "该群组将对所有成员消失，且无法恢复。",
   'group.filter': '筛选文件…',
   'group.col_name': '名称',
   'group.col_size': '大小',