feat: workspace-first UI refresh - PR-2 workspace detail page
- Add workspace detail page (/workspaces/:id) with 4 tabs:
- Files: file tree, viewer, editor, git toolbar (commit/push/pull/fetch)
- Git: branch selector, commit history
- Tools: instance grid, start tool modal
- Settings: workspace info read-only
- Add workspace API clients: workspace-files, workspace-git, workspace-instances
- Add hooks: useWorkspaceFiles, useWorkspaceGit, useWorkspaceInstances
- WorkspaceCard links to detail page via router Link
- Add comprehensive CSS for workspace detail layout
- Mobile: bottom tab bar, responsive file tree/split
- TypeScript + eslint clean
Quality gates: tsc --noEmit clean, eslint clean
alex
27c77af591