fix(hub): merge duplicate sources in Search's Music and Photos too

Phases 5-8 of docs/refactoring-search.md, extending the Videos merge
outward. A library shared by two groups now lists each track once inside
an album and each photo once inside a photo album, and a card served by
several groups says "N sources" instead of naming one of them.

Units come from each application's own grouping, never a copy of its
keys. For Music that meant exporting foldKey: groupMusicEntries folds
case to group but keeps the first-seen spelling to display, and which
group is seen first is whichever index arrived first — so keying a unit
on the display strings would let the chosen source change between page
loads.

A group whose connection fails is marked down and stops being chosen, so
a unit fails over to another group that has the file. Eviction is not a
failure. Every source being down still yields an entry: a tile that
fails to load beats a film that vanished from the grid.

sourceLabel now takes the whole unit rather than one entry. A show's
poster entry is picked for its thumbnail, so a show in two groups whose
cover episode sits in only one of them would have claimed a single
source. SourceTag lives in group-name.js — source-merge.js must keep
importing nothing (its test executes it standalone), and a copy in each
of the three apps is three chances to disagree.

test_search_files_unmerged.py holds the one thing that must not change:
the Files explorer is not merged, because there each group is a folder
and merging would remove a file from one of them. It also asserts the
other three lists are merged, or deleting the merge outright would leave
it passing and saying nothing.

One plan item was dropped as wrong rather than built: the Music queue in
onPreview needed no change. It filters by groupId and is reachable only
from FilesPanel, which is not merged.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01AbwJDbNTkiRUh7HTWEoyss

10 files changed, 10 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 f118ffe..b66c847 100644
--- a/packages/meshbay-hub/src/meshbay_hub/static/locales/de.js
+++ b/packages/meshbay-hub/src/meshbay_hub/static/locales/de.js
@@ -616,6 +616,7 @@ export default {
   'search.hint': 'Tippen Sie einen Begriff ein, um in allen Ihren Gruppen zu suchen.',
   'search.indexing': 'Indexierung von {done} / {total} Gruppen …',
   'search.unreachable': { one: '{n} Gruppe nicht erreichbar', other: '{n} Gruppen nicht erreichbar' },
+  'search.n_sources': { one: '{n} Quelle', other: '{n} Quellen' },
   'search.view_files': 'Dateien',
   'search.view_videos': 'Videos',
   'search.view_music': 'Musik',
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 b55359b..898f7f4 100644
--- a/packages/meshbay-hub/src/meshbay_hub/static/locales/en.js
+++ b/packages/meshbay-hub/src/meshbay_hub/static/locales/en.js
@@ -690,6 +690,7 @@ export default {
   'search.hint': 'Type to search file names across all your groups.',
   'search.indexing': 'Indexing {done} / {total} groups...',
   'search.unreachable': { one: '{n} group unreachable', other: '{n} groups unreachable' },
+  'search.n_sources': { one: '{n} source', other: '{n} sources' },
   'search.view_files': 'Files',
   'search.view_videos': 'Videos',
   'search.view_music': 'Music',
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 8e90dca..8d06a2d 100644
--- a/packages/meshbay-hub/src/meshbay_hub/static/locales/es.js
+++ b/packages/meshbay-hub/src/meshbay_hub/static/locales/es.js
@@ -612,6 +612,7 @@ export default {
   'search.hint': 'Escriba un término para buscar en todos sus grupos.',
   'search.indexing': 'Indexando {done} / {total} grupos…',
   'search.unreachable': { one: '{n} grupo inalcanzable', other: '{n} grupos inalcanzables' },
+  'search.n_sources': { one: '{n} fuente', other: '{n} fuentes' },
   'search.view_files': 'Archivos',
   'search.view_videos': 'Vídeos',
   'search.view_music': 'Música',
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 995d4b3..1999e7e 100644
--- a/packages/meshbay-hub/src/meshbay_hub/static/locales/fr.js
+++ b/packages/meshbay-hub/src/meshbay_hub/static/locales/fr.js
@@ -615,6 +615,7 @@ export default {
   'search.hint': 'Saisissez un terme pour rechercher dans tous vos groupes.',
   'search.indexing': 'Indexation de {done} / {total} groupes…',
   'search.unreachable': { one: '{n} groupe injoignable', other: '{n} groupes injoignables' },
+  'search.n_sources': { one: '{n} source', other: '{n} sources' },
   'search.view_files': 'Fichiers',
   'search.view_videos': 'Vidéos',
   'search.view_music': 'Musique',
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 467521f..52e18a8 100644
--- a/packages/meshbay-hub/src/meshbay_hub/static/locales/it.js
+++ b/packages/meshbay-hub/src/meshbay_hub/static/locales/it.js
@@ -614,6 +614,7 @@ export default {
   'search.hint': 'Digita un termine per cercare in tutti i tuoi gruppi.',
   'search.indexing': 'Indicizzazione di {done} / {total} gruppi…',
   'search.unreachable': { one: '{n} gruppo non raggiungibile', other: '{n} gruppi non raggiungibili' },
+  'search.n_sources': { one: '{n} fonte', other: '{n} fonti' },
   'search.view_files': 'File',
   'search.view_videos': 'Video',
   'search.view_music': 'Musica',
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 89e8bdd..c0560b3 100644
--- a/packages/meshbay-hub/src/meshbay_hub/static/locales/ja.js
+++ b/packages/meshbay-hub/src/meshbay_hub/static/locales/ja.js
@@ -602,6 +602,7 @@ 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.n_sources': { other: '{n} 個のソース' },
   'search.view_files': 'ファイル',
   'search.view_videos': '動画',
   'search.view_music': '音楽',
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 1ed0362..da6dc04 100644
--- a/packages/meshbay-hub/src/meshbay_hub/static/locales/nl.js
+++ b/packages/meshbay-hub/src/meshbay_hub/static/locales/nl.js
@@ -616,6 +616,7 @@ export default {
   'search.hint': 'Typ een zoekterm om in al uw groepen te zoeken.',
   'search.indexing': '{done} / {total} groepen indexeren…',
   'search.unreachable': { one: '{n} groep onbereikbaar', other: '{n} groepen onbereikbaar' },
+  'search.n_sources': { one: '{n} bron', other: '{n} bronnen' },
   'search.view_files': 'Bestanden',
   'search.view_videos': 'Video\'s',
   'search.view_music': 'Muziek',
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 f71d048..29feebe 100644
--- a/packages/meshbay-hub/src/meshbay_hub/static/locales/pl.js
+++ b/packages/meshbay-hub/src/meshbay_hub/static/locales/pl.js
@@ -634,6 +634,7 @@ export default {
   'search.hint': 'Wpisz frazę, aby wyszukać we wszystkich grupach.',
   'search.indexing': 'Indeksowanie {done} / {total} grup…',
   'search.unreachable': { one: '{n} grupa nieosiągalna', few: '{n} grupy nieosiągalne', many: '{n} grup nieosiągalnych', other: '{n} grupy nieosiągalnej' },
+  'search.n_sources': { one: '{n} źródło', few: '{n} źródła', many: '{n} źródeł', other: '{n} źródła' },
   'search.view_files': 'Pliki',
   'search.view_videos': 'Filmy',
   'search.view_music': 'Muzyka',
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 1919edd..d2fc355 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
@@ -613,6 +613,7 @@ export default {
   'search.hint': 'Digite um termo para pesquisar em todos os seus grupos.',
   'search.indexing': 'Indexando {done} / {total} grupos…',
   'search.unreachable': { one: '{n} grupo inacessível', other: '{n} grupos inacessíveis' },
+  'search.n_sources': { one: '{n} fonte', other: '{n} fontes' },
   'search.view_files': 'Arquivos',
   'search.view_videos': 'Vídeos',
   'search.view_music': 'Música',
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 489311e..6840774 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
@@ -589,6 +589,7 @@ export default {
   'search.hint': '输入关键词搜索所有群组。',
   'search.indexing': '正在索引 {done} / {total} 个群组…',
   'search.unreachable': { other: '{n} 个群组无法连接' },
+  'search.n_sources': { other: '{n} 个来源' },
   'search.view_files': '文件',
   'search.view_videos': '视频',
   'search.view_music': '音乐',