feat(skills): add registry tab with skill browsing and detail page

[samuv]

The Skills page previously only showed installed skills and local builds. This adds a read-only Registry tab that lets users browse skills from the default registry without installing them first.

• Add a Registry tab as the first tab on the Skills page, with a debounced server-side search input and a responsive card grid showing each skill's name, namespace, description (clamped to 3 lines with a tooltip on overflow), and an Install button that pre-fills the reference
• Persist the active tab in the URL (?tab=registry|installed|builds) so navigating away and back restores the correct tab
• Add a skill detail page at /skills/$namespace/$skillName with a two-column layout (summary + Install on the left, Skill.md placeholder on the right), loaded via the single-skill API endpoint with 404 handling; the Back button returns to /skills?tab=registry
• Add unit tests for CardRegistrySkill covering rendering, card navigation, and install dialog pre-fill

Kapture.2026-04-15.at.10.38.57.mp4

[Copilot]

Pull request overview

Adds read-only registry browsing to the Skills area, including URL-persisted tab selection and a new skill detail route backed by the v0.1 registry skills endpoints.

Changes:

• Adds a Registry tab to /skills with server-side, debounced search and a registry skills card grid.
• Introduces a skill detail route /skills/$namespace/$skillName with not-found handling and an install CTA.
• Adds unit tests for the new CardRegistrySkill component (rendering, navigation, install prefill).

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
renderer/src/routes/skills_.$namespace.$skillName.tsx	New registry skill detail route with loader-based data fetching and 404 mapping to notFound UI
renderer/src/routes/skills.tsx	Adds tab search param validation and prefetches registry skills list in the route loader
renderer/src/route-tree.gen.ts	Generated route tree updates to include the new skill detail route
renderer/src/features/skills/components/skills-page.tsx	Adds Registry tab UI, debounced search state, and registry list query wiring
renderer/src/features/skills/components/skill-detail-page.tsx	New detail page layout with Back-to-registry behavior and install dialog prefill
renderer/src/features/skills/components/grid-cards-registry-skills.tsx	New grid component for registry skill cards + empty state
renderer/src/features/skills/components/card-registry-skill.tsx	New registry skill card with navigation and install action
renderer/src/features/skills/components/tests/card-registry-skill.test.tsx	Tests for registry card rendering, navigation behavior, and install dialog prefill