The Skills tab now lists the entire official optional-skills catalog
(optional-skills/ shipped with the repo) below the installed skills.
Each catalog row has an Install button that routes through the standard
hub action pipeline; once the install finishes the row flips into the
installed list with the normal enabled/disabled toggle.
- backend: GET /api/skills/hub/official — OptionalSkillSource.list_local()
scan (no network) + per-profile installed flags from the hub lock
- desktop: catalog section in SkillsView with search/scope integration,
install-state spinners off $hubActions, and an OfficialSkillDetail pane
(hub preview: frontmatter + full SKILL.md + Install)
- CapRow gains an optional action slot (button instead of the Switch)
- electron: route the new endpoint with the skills family (primary backend)
- i18n: officialCatalog/officialPill keys across en/ja/zh/zh-hant
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