Build Repository & Workspace management tabs

[itdove]

Description

Create tabs for repository configuration and workspace management.

Tasks

• Create RepoConfigTab component
• Create WorkspaceManager component
• Implement workspace DataList with add/edit/delete
• Create AddEditWorkspaceModal
• Add context file manager
• Implement file path validation
• Add visual indicators for active workspace
• Handle workspace updates and state

Acceptance Criteria

• Workspaces displayed in PatternFly DataList
• Add/Edit/Delete workspace buttons work
• Modal opens for add/edit operations
• Path validation prevents invalid paths
• Context files can be added/removed
• Active workspace is visually distinct
• All changes update parent state correctly

Estimated Effort: 5-7 days

[itdove]

Child of #305