feat: open a group, a folder or a file from a #/name@owner link

A group can now be reached by the handle shown under its name, and a path
after it points inside the group: #/name@owner/root/dir/file downloads the
file and opens Files on its folder; a folder opens Files there. The handle
is resolved in the client against the account's own /v1/groups/mine, so no
hub route answers for a name and nobody can probe for one. While a group is
open the address shows the handle (replace, no history entry); a linked path
is taken out of the address once acted on, so a reload does not download
twice.

Signing in no longer sends everyone home: the form stood in for the page the
address named, and that is where a link opened signed out was going.

group-link.js holds the parsing and lookups, executed whole by
test_group_link.py; harness/group_link_probe.py drives the router in Chrome.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

10 files changed, 20 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 5cc9968..8d14dca 100644
--- a/packages/meshbay-hub/src/meshbay_hub/static/locales/de.js
+++ b/packages/meshbay-hub/src/meshbay_hub/static/locales/de.js
@@ -210,6 +210,8 @@ export default {
   'group.mkdir_prompt': 'Name des neuen Ordners',
   'group.mkdir_offline': 'Nicht mit dem Node verbunden.',
   'group.download_offline': 'Keine Verbindung zum Node — der Download kann nicht starten. Die Verbindung wird automatisch wiederhergestellt; versuchen Sie es gleich erneut.',
+  'group.link_unknown': "Dieser Link verweist auf eine Gruppe, in der Sie nicht Mitglied sind, oder die nicht mehr so heißt.",
+  'group.link_path_unknown': "Unter {path} gibt es in dieser Gruppe nichts — die Datei wurde vielleicht verschoben, umbenannt oder gelöscht.",
   'group.download_write_stalled': 'Die Datei wird nicht mehr auf die Festplatte geschrieben ({seconds} s ohne Fortschritt). Der Download wurde abgebrochen statt hängen gelassen; versuchen Sie es erneut.',
   'device.add_title': 'This browser is not linked to this node yet',
   'device.add_hint': 'Your account is known here, but this browser holds a different key. Approve it from a device already linked — no operator needed.',
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 5aa53b7..a6cd0b4 100644
--- a/packages/meshbay-hub/src/meshbay_hub/static/locales/en.js
+++ b/packages/meshbay-hub/src/meshbay_hub/static/locales/en.js
@@ -210,6 +210,8 @@ export default {
   'group.mkdir_prompt': 'New folder name',
   'group.mkdir_offline': 'Not connected to the node.',
   'group.download_offline': 'Not connected to the node — the download cannot start. It reconnects on its own; try again in a moment.',
+  'group.link_unknown': "This link names a group you are not a member of, or one that no longer goes by that name.",
+  'group.link_path_unknown': "Nothing at {path} in this group — the file may have been moved, renamed or deleted.",
   'group.download_write_stalled': 'The file stopped being written to disk ({seconds}s with no progress). The download was stopped rather than left hanging; try it again.',
   'device.add_title': 'This browser is not linked to this node yet',
   'device.add_hint': 'Your account is known here, but this browser holds a different key. Approve it from a device already linked — no operator needed.',
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 6558a46..e066081 100644
--- a/packages/meshbay-hub/src/meshbay_hub/static/locales/es.js
+++ b/packages/meshbay-hub/src/meshbay_hub/static/locales/es.js
@@ -208,6 +208,8 @@ export default {
   'group.mkdir_prompt': 'Nombre de la nueva carpeta',
   'group.mkdir_offline': 'Sin conexión con el nodo.',
   'group.download_offline': 'Sin conexión con el nodo — la descarga no puede empezar. Se reconecta sola; inténtelo de nuevo en un momento.',
+  'group.link_unknown': "Este enlace nombra un grupo del que no eres miembro, o que ya no se llama así.",
+  'group.link_path_unknown': "No hay nada en {path} en este grupo: puede que el archivo se haya movido, renombrado o eliminado.",
   'group.download_write_stalled': 'El archivo dejó de escribirse en el disco ({seconds} s sin avance). La descarga se detuvo en lugar de quedarse colgada; inténtelo de nuevo.',
   'device.add_title': 'This browser is not linked to this node yet',
   'device.add_hint': 'Your account is known here, but this browser holds a different key. Approve it from a device already linked — no operator needed.',
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 5e4c0bf..01ccfcd 100644
--- a/packages/meshbay-hub/src/meshbay_hub/static/locales/fr.js
+++ b/packages/meshbay-hub/src/meshbay_hub/static/locales/fr.js
@@ -209,6 +209,8 @@ export default {
   'group.mkdir_prompt': 'Nom du nouveau dossier',
   'group.mkdir_offline': 'Non connecté au nœud.',
   'group.download_offline': 'Pas de connexion au node — le téléchargement ne peut pas démarrer. La reconnexion est automatique, réessayez dans un instant.',
+  'group.link_unknown': "Ce lien désigne un groupe dont vous n'êtes pas membre, ou qui ne porte plus ce nom.",
+  'group.link_path_unknown': "Rien à l'emplacement {path} dans ce groupe — le fichier a peut-être été déplacé, renommé ou supprimé.",
   'group.download_write_stalled': 'L\'écriture du fichier sur le disque s\'est arrêtée ({seconds} s sans progression). Le téléchargement a été interrompu plutôt que laissé en suspens ; réessayez.',
   'device.add_title': 'Ce navigateur n’est pas encore lié à ce nœud',
   'device.add_hint': 'Votre compte est connu ici, mais ce navigateur détient une autre clé. Approuvez-le depuis un appareil déjà lié — sans passer par l’opérateur.',
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 8772376..71af9f8 100644
--- a/packages/meshbay-hub/src/meshbay_hub/static/locales/it.js
+++ b/packages/meshbay-hub/src/meshbay_hub/static/locales/it.js
@@ -209,6 +209,8 @@ export default {
   'group.mkdir_prompt': 'Nome della nuova cartella',
   'group.mkdir_offline': 'Non connesso al nodo.',
   'group.download_offline': 'Nessuna connessione al nodo — il download non può iniziare. La riconnessione è automatica, riprovi tra poco.',
+  'group.link_unknown': "Questo link indica un gruppo di cui non sei membro, o che non ha più questo nome.",
+  'group.link_path_unknown': "Non c'è nulla in {path} in questo gruppo: il file potrebbe essere stato spostato, rinominato o eliminato.",
   'group.download_write_stalled': 'Il file ha smesso di essere scritto su disco ({seconds} s senza progressi). Il download è stato interrotto invece di restare bloccato; riprovi.',
   'device.add_title': 'This browser is not linked to this node yet',
   'device.add_hint': 'Your account is known here, but this browser holds a different key. Approve it from a device already linked — no operator needed.',
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 fa34470..4b357c8 100644
--- a/packages/meshbay-hub/src/meshbay_hub/static/locales/ja.js
+++ b/packages/meshbay-hub/src/meshbay_hub/static/locales/ja.js
@@ -207,6 +207,8 @@ export default {
   'group.mkdir_prompt': '新しいフォルダー名',
   'group.mkdir_offline': 'ノードに接続していません。',
   'group.download_offline': 'ノードに接続していません — ダウンロードを開始できません。再接続は自動で行われます。少し待って再試行してください。',
+  'group.link_unknown': "このリンクは、あなたがメンバーでないグループ、またはもうその名前ではないグループを指しています。",
+  'group.link_path_unknown': "このグループの {path} には何もありません。ファイルが移動、名前変更、または削除された可能性があります。",
   'group.download_write_stalled': 'ファイルのディスクへの書き込みが止まりました（{seconds} 秒間進みません）。ぶら下がったままにせず中止しました。もう一度お試しください。',
   'device.add_title': 'This browser is not linked to this node yet',
   'device.add_hint': 'Your account is known here, but this browser holds a different key. Approve it from a device already linked — no operator needed.',
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 fa0841d..1f4b12c 100644
--- a/packages/meshbay-hub/src/meshbay_hub/static/locales/nl.js
+++ b/packages/meshbay-hub/src/meshbay_hub/static/locales/nl.js
@@ -210,6 +210,8 @@ export default {
   'group.mkdir_prompt': 'Naam van de nieuwe map',
   'group.mkdir_offline': 'Niet verbonden met de node.',
   'group.download_offline': 'Geen verbinding met de node — de download kan niet starten. Er wordt automatisch opnieuw verbonden; probeer het zo weer.',
+  'group.link_unknown': "Deze link verwijst naar een groep waarvan je geen lid bent, of die niet meer zo heet.",
+  'group.link_path_unknown': "Er staat niets op {path} in deze groep — het bestand is misschien verplaatst, hernoemd of verwijderd.",
   'group.download_write_stalled': 'Het bestand wordt niet meer naar schijf geschreven ({seconds} s zonder voortgang). De download is gestopt in plaats van te blijven hangen; probeer het opnieuw.',
   'device.add_title': 'This browser is not linked to this node yet',
   'device.add_hint': 'Your account is known here, but this browser holds a different key. Approve it from a device already linked — no operator needed.',
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 9de29ea..05a3006 100644
--- a/packages/meshbay-hub/src/meshbay_hub/static/locales/pl.js
+++ b/packages/meshbay-hub/src/meshbay_hub/static/locales/pl.js
@@ -213,6 +213,8 @@ export default {
   'group.mkdir_prompt': 'Nazwa nowego folderu',
   'group.mkdir_offline': 'Brak połączenia z węzłem.',
   'group.download_offline': 'Brak połączenia z węzłem — pobieranie nie może się rozpocząć. Połączenie wróci samo; proszę spróbować za chwilę.',
+  'group.link_unknown': "Ten link wskazuje grupę, do której nie należysz, lub która nie nosi już tej nazwy.",
+  'group.link_path_unknown': "W tej grupie nie ma niczego pod {path} — plik mógł zostać przeniesiony, zmieniony lub usunięty.",
   'group.download_write_stalled': 'Plik przestał być zapisywany na dysk ({seconds} s bez postępu). Pobieranie zostało przerwane, zamiast wisieć w nieskończoność; proszę spróbować ponownie.',
   'device.add_title': 'This browser is not linked to this node yet',
   'device.add_hint': 'Your account is known here, but this browser holds a different key. Approve it from a device already linked — no operator needed.',
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 908a8db..824c69a 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
@@ -210,6 +210,8 @@ export default {
   'group.mkdir_prompt': 'Nome da nova pasta',
   'group.mkdir_offline': 'Sem conexão com o nó.',
   'group.download_offline': 'Sem conexão com o nó — o download não pode começar. Ele reconecta sozinho; tente de novo em instantes.',
+  'group.link_unknown': "Este link aponta para um grupo do qual você não é membro, ou que não tem mais esse nome.",
+  'group.link_path_unknown': "Não há nada em {path} neste grupo — o arquivo pode ter sido movido, renomeado ou excluído.",
   'group.download_write_stalled': 'O arquivo parou de ser gravado no disco ({seconds}s sem progresso). O download foi interrompido em vez de ficar travado; tente de novo.',
   'device.add_title': 'This browser is not linked to this node yet',
   'device.add_hint': 'Your account is known here, but this browser holds a different key. Approve it from a device already linked — no operator needed.',
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 d6fe782..d0d3954 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
@@ -206,6 +206,8 @@ export default {
   'group.mkdir_prompt': '新文件夹名称',
   'group.mkdir_offline': '未连接到节点。',
   'group.download_offline': '未连接到节点 — 无法开始下载。连接会自动恢复，请稍后重试。',
+  'group.link_unknown': "此链接指向一个您不是其成员的群组，或该群组已不再使用此名称。",
+  'group.link_path_unknown': "此群组中 {path} 处没有内容——文件可能已被移动、重命名或删除。",
   'group.download_write_stalled': '文件停止写入磁盘（{seconds} 秒无进展）。已中止下载而不是让它一直卡住，请重试。',
   'device.add_title': 'This browser is not linked to this node yet',
   'device.add_hint': 'Your account is known here, but this browser holds a different key. Approve it from a device already linked — no operator needed.',