Feat/composition set operations

[DagmawiKK]

This PR introduces two new set operations (composition and union) to the Mork API along with comprehensive frontend implementations, status polling, and enhanced utilities.

Key Changes:

Backend (Rust API):

1. New Routes:

   • /spaces/composition - Performs composition of multiple source namespaces into a target namespace
   • /spaces/union - Performs union operations across multiple namespaces

2. Status Endpoint:

   • Added /status/<namespace> endpoint for checking namespace status
   • Supports polling to wait for operations to complete

3. Enhanced Transform Logic:

   • Composition creates transforms with pattern variables ($0, $1, etc.)
   • Union creates multiple independent transforms with sequential execution
   • Added polling mechanism with 40-second timeout

4. Testing:

   • Added comprehensive unit tests for composition and union transforms
   • Integration tests with mock server for composition endpoints

Frontend (SolidJS):

1. New Pages:

   • Composition Page: Builder UI for creating composition operations
   • Union Page: Builder UI for union operations

2. Enhanced Components:

   • Reusable CompositionInput and UnionInput components for namespace selection
   • Real-time S-expression preview with copy functionality
   • Polling status indicators and progress feedback

3. API Integration:

   • Added composition() and union() API functions
   • Enhanced importSpace() with proper path handling
   • Added status polling utilities

4. Utility Functions:

   • Added pathToSExpr() for converting path arrays to S-expressions
   • Enhanced existing utilities with better error handling

Features:

• Real-time Polling: Operations automatically poll for completion status
• Permission Validation: Checks token permissions for source and target namespaces
• Responsive UI: Clean, modern interface with card-based layouts
• Error Handling: Comprehensive error states and user feedback
• Copy Functionality: One-click copying of generated S-expressions

Technical Details:

• Composition: Combines multiple source namespaces into a single target using pattern variables
• Union: Creates independent transforms for each source namespace into a common target
• Status Polling: Uses timeout-based polling with 1-second intervals
• Token Integration: Leverages existing token-based authentication system

Testing:

• Unit tests for transform generation logic
• Integration tests with mock HTTP server
• Path normalization and S-expression generation tests

Related Issue

Closes #38

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist

• I have read the Contributing Guidelines.
• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
• I have made corresponding changes to the documentation.
• My changes generate no new warnings.
• I have added tests that prove my fix is effective or that my feature works.
• New and existing unit tests pass locally with my changes.
• Any dependent changes have been merged and published in downstream modules.

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