feat(skills): align skill cards with registry design and add local build detail page

[samuv]

The skills feature had three card variants with inconsistent layouts and no detail page for local builds. This PR aligns the visual design across all skill cards and adds a navigable detail page for local builds.

• Extract CardSkillBase as a shared card shell for all skill card variants (installed, registry, local builds), matching the layout and interaction pattern of the MCP registry cards — clickable title with overlay, consistent hover/focus rings, optional subtitle, description, badges, and footer slots
• Refactor CardRegistrySkill, CardSkill, and CardBuild to use CardSkillBase; card clicks navigate to detail pages, footer actions use stopPropagation
• Extract SkillDetailLayout as a shared two-column detail layout (header + Summary + right panel) reused by both the registry skill detail and the new build detail page
• Add backSearch prop to RegistryDetailHeader so skills can navigate back to the correct tab
• Add local build detail page at /skills/builds/$tag with version/tag/digest metadata, Install + Remove actions, and the Skill.md placeholder panel; encode tag param to handle slashes safely
• Redirect to the builds list after successfully removing a build from its detail page
• Align all card action buttons (Install, Uninstall, Remove) to secondary + rounded-full per the Figma design

Kapture.2026-04-16.at.16.17.02.mp4

[Copilot]

Pull request overview

Aligns the Skills UI with the registry card/design patterns by introducing shared card and detail-page layout primitives, and adds a navigable detail page for local builds (/skills/builds/$tag).

Changes:

• Added a local build detail route/page and wired navigation to it from build cards (with encoded tag params).
• Extracted shared UI primitives (CardSkillBase, SkillDetailLayout) and refactored existing skill/build/registry cards and the registry skill detail page to use them.
• Extended RegistryDetailHeader to support backSearch so “Back” navigation can preserve the correct tab.

Reviewed changes

Copilot reviewed 12 out of 12 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
renderer/src/routes/skills_.builds.$tag.tsx	New route for local build details; fetches builds list and renders BuildDetailPage or not-found state.
renderer/src/route-tree.gen.ts	Generated route-tree update to include /skills/builds/$tag.
renderer/src/features/skills/components/skill-detail-page.tsx	Refactors registry skill detail page to use shared SkillDetailLayout.
renderer/src/features/skills/components/skill-detail-layout.tsx	New shared two-column detail layout built on RegistryDetailHeader.
renderer/src/features/skills/components/dialog-delete-build.tsx	Adds optional onSuccess callback after successful deletion.
renderer/src/features/skills/components/card-skill.tsx	Refactors installed-skill card to use CardSkillBase and stopPropagation for footer actions.
renderer/src/features/skills/components/card-skill-base.tsx	New shared card shell used by skill/build/registry cards.
renderer/src/features/skills/components/card-registry-skill.tsx	Refactors registry skill card to use CardSkillBase and unified footer button styling.
renderer/src/features/skills/components/card-build.tsx	Refactors build card to use CardSkillBase and navigates to build detail when tag exists.
renderer/src/features/skills/components/build-detail-page.tsx	New build detail page using SkillDetailLayout with metadata badges and actions.
renderer/src/features/skills/components/tests/card-build.test.tsx	Updates assertions to reflect new card content formatting (description + digest).
renderer/src/features/registry-servers/components/registry-detail-header.tsx	Adds backSearch prop and passes it through to the back link.