feat: a group can be left out of Search, and Search tries every node

`search_listed` is a per-group setting on the node, changed by a signed
operator op and carried in the sealed handshake ack. Search reads it after
the handshake and stops there: no index is fetched, cached or merged, in any
of the four views, and the page says how many groups it left out. The switch
is a "Search" section in the group's settings, shown to the operator.

Absent means listed, at every layer: roster default, ack default, and the
client only drops a group on an explicit `false` — so an upgrade or an older
node removes nothing from anyone's Search.

It is a listing preference and protects nothing: the node serves the same
index to Search and to the group page and cannot tell them apart, every
member lists the group by opening it, and a client that ignores the flag
lists it in Search too. Design §9.11 says so, so it is never described as
private. The cost is one handshake per unlisted group, because only the node
knows the setting.

Search also took `nodes[0]` twice — for the index and for the pooled
connection — the defect 4cce50f fixed on the group page only. One
`connectToGroup` now walks the list the same way: a refusal about this
browser stops, `not_hosted` or a failed connection moves on.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01XuNrwLf5EFWCMHzfoEvnpm

1 files changed, 4 insertions, 0 deletions

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 3140527..4db42a1 100644
--- a/packages/meshbay-hub/src/meshbay_hub/static/locales/ja.js
+++ b/packages/meshbay-hub/src/meshbay_hub/static/locales/ja.js
@@ -695,6 +695,7 @@ export default {
   'search.hint': '入力してすべてのグループを検索します。',
   'search.indexing': '{done} / {total} グループをインデックス中…',
   'search.unreachable': { other: '{n} グループに接続できません' },
+  'search.unlisted': { other: '{n} グループは検索に表示されません — 開いて閲覧してください' },
   'search.n_sources': { other: '{n} 個のソース' },
   'search.view_files': 'ファイル',
   'search.view_videos': '動画',
@@ -882,6 +883,9 @@ export default {
   'settings_node.roots': '共有ディレクトリ',
   'settings_node.scan_title': 'スキャン',
   'settings_node.scan_hint': 'node が見逃した変更がないかディレクトリを再確認する頻度と、ファイルの変更後にインデックスするまで待つ時間。',
+  'settings_node.search_listed_title': '検索',
+  'settings_node.search_listed_label': 'このグループを検索に表示する',
+  'settings_node.search_listed_hint': 'オフにすると、このグループのファイルはメンバーのグループ横断検索に表示されません。メンバーはグループを開けば引き続きすべて見られます。全体の一覧から外すだけで、誰に対しても何も隠しません。',
   'settings_node.scan_reconcile_label': '再確認の間隔（分）',
   'settings_node.scan_debounce_label': '変更後の待機時間（秒）',
   'settings_node.scan_save': '保存',