feat(artifacts): list view, skill packs, badges by exception

The page showed every artifact as a tall card with a blue Install and four
text actions, a Shared badge on nearly all of them and 12 cards per section,
so 26 artifacts filled ~1900px (5000px on a phone).

- List view by default (Grid kept, a per-browser choice): one row per
  artifact — kind icon, name, one line of description, owner and installs,
  ONE primary action, everything else in its ⋯ menu / right-click.
- Three or more skills of one owner sharing a name prefix (sg-*, vp-*) are
  one pack row: open it for its skills, or Install all / Install N more
  after one confirmation (a name already there is left alone).
- Badges only for the exception: Private (not shared), Hub only, Auto.
- No per-section paging: 30 entries, then Show more.
- Scope tabs under the title; category chips scroll on a phone.
- Another user's private row (seen by an admin) gets its own section
  instead of sitting under Shared by others.
- "1 installs" → "1 install".

client/src/i18n/locales/en/artifacts.json

@@ -34,7 +34,6 @@
   "download": "Download",
   "noPreview": "This file type cannot be shown here — download it to open it.",
   "install": "Install",
-  "installs": "{{count}} installs",
   "installed": "Installed to {{path}}",
   "installedPlugin": "Installed {{name}} — start a new session (or /reload-plugins) to use it",
   "rename": "Edit",
@@ -197,5 +196,23 @@
   "unowned.claimed": "Added to your library",
   "unowned.declined": "Removed from your list",
   "unowned.assigned": "Owner assigned",
-  "unowned.empty": "Nothing without an owner."
+  "unowned.empty": "Nothing without an owner.",
+  "installs_one": "{{count}} install",
+  "installs_other": "{{count}} installs",
+  "private": "Private",
+  "privateHint": "Not shared: only you (and admins) see it. Share puts it in the Hub.",
+  "showMore": "Show {{count}} more",
+  "view.label": "Layout",
+  "view.list": "List view",
+  "view.grid": "Grid view",
+  "pack.title": "{{prefix}}-* pack",
+  "pack.count_one": "{{count}} skill",
+  "pack.count_other": "{{count}} skills",
+  "pack.installAll": "Install all",
+  "pack.installRest": "Install {{count}} more",
+  "pack.installTitle": "Install {{count}} skills of {{prefix}}-*?",
+  "pack.installBody": "Each one is written into your own account. A skill you already have under the same name is left as it is:",
+  "pack.installed": "Installed {{ok}} · already there {{skipped}} · failed {{failed}}",
+  "section.unshared": "Not shared by their owners",
+  "section.unsharedHint": "Other users' private items — only admins see these"
 }

client/src/i18n/locales/vi/artifacts.json

@@ -197,5 +197,20 @@
   "unowned.claimed": "Đã nhận về thư viện của bạn",
   "unowned.declined": "Đã bỏ khỏi danh sách của bạn",
   "unowned.assigned": "Đã gán chủ",
-  "unowned.empty": "Không có mục nào chưa có chủ."
+  "unowned.empty": "Không có mục nào chưa có chủ.",
+  "private": "Riêng tư",
+  "privateHint": "Chưa chia sẻ: chỉ bạn (và admin) thấy. Bấm Chia sẻ để đưa lên Hub.",
+  "showMore": "Xem thêm {{count}}",
+  "view.label": "Cách hiển thị",
+  "view.list": "Dạng danh sách",
+  "view.grid": "Dạng lưới",
+  "pack.title": "Bộ {{prefix}}-*",
+  "pack.count": "{{count}} skill",
+  "pack.installAll": "Cài tất cả",
+  "pack.installRest": "Cài {{count}} còn lại",
+  "pack.installTitle": "Cài {{count}} skill của bộ {{prefix}}-*?",
+  "pack.installBody": "Mỗi skill được ghi vào tài khoản của bạn. Skill nào bạn đã có cùng tên thì giữ nguyên:",
+  "pack.installed": "Đã cài {{ok}} · đã có sẵn {{skipped}} · lỗi {{failed}}",
+  "section.unshared": "Chủ chưa chia sẻ",
+  "section.unsharedHint": "Mục riêng tư của người khác — chỉ admin thấy"
 }