feat(03-01): add SkillsSection layout, SkillList, SkillFileTree, and SkillImportModal
- Create SkillsSection with two-column grid layout (19rem + flex) matching Paperclip pattern
- Create SkillList with source icons, expandable file trees, CSS grid animation
- Create SkillFileTree with recursive rendering, dir/file icons, indent levels
- Create SkillImportModal with 4 tabs: GitHub, Local Path, HTTP URL, skills.sh
- Wire listSkills IPC for skill loading and importSkill IPC for import flow
- Add skill IPC channels, Zod schemas, and DesktopApi methods to contracts.ts
- Add skill IPC bridge methods to preload/index.ts
- All Phosphor icons, all ui.tsx components, no external dependencies
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
ZacharyZhang-NYandClaude Opus 4.6
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