Improve test coverage for challengeHostTeamsCtrl.js from 70.51%

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Description

This PR addresses issue #4731 by significantly improving test coverage for challengeHostTeamsCtrl.js from the current 70.51%.

Changes Made

Based on systematic analysis using Lumyst (Gemini 2.5 Pro Sequential Thinking), I identified and implemented the following missing test cases:

1. Untested Functions

• ✅ Added comprehensive tests for activateCollapsible() function
• ✅ Added detailed tests for load() function with success, error, and edge cases

2. Critical Edge Cases

• ✅ Zero results pagination scenario (count: 0)
• ✅ Initial load failure handling
• ✅ HTTP error handling in load function
• ✅ Null URL handling in load function

3. Enhanced Error Handling Tests

• ✅ Specific error response parsing for different HTTP status codes
• ✅ Error handling when retrieving updated lists fails
• ✅ Error handling when refreshing team list after creation fails

4. Dialog Interaction Tests

• ✅ Event propagation handling (stopPropagation)
• ✅ Dialog cancellation scenarios
• ✅ Invitation of existing team members
• ✅ Comprehensive pagination state after deletion

5. Form Validation & State Management

• ✅ Team object reset after successful operations
• ✅ Error state management
• ✅ Loader container assignment
• ✅ Edge cases for storeChallengeHostTeamId with null/undefined values

How Lumyst Assisted

Lumyst (Gemini 2.5 Pro Sequential Thinking) was instrumental in this process:

1. Systematic Code Analysis: Lumyst analyzed the controller code line-by-line to identify untested code paths
2. Gap Identification: It categorized missing tests into 4 main areas: untested functions, edge cases, conditional branches, and user-flow scenarios
3. Prioritization: Lumyst helped prioritize which test cases would have the most impact on coverage improvement
4. Edge Case Discovery: It identified subtle scenarios like pagination state after deletion and error parsing that were previously missed

Test Coverage Improvements

• Before: 70.51%
• Added: 25+ new comprehensive test cases
• Focus Areas: Error handling, edge cases, user interactions, state management

Files Changed

• frontend/tests/controllers-test/challengeHostTeamsCtrl.test.js - Enhanced with comprehensive test coverage

Testing

All new tests follow the existing testing patterns and use proper mocking/spying techniques. The tests cover:

• Success scenarios
• Error scenarios
• Edge cases
• User interaction flows
• State management

Suggestions for Lumyst Improvements

1. Code Coverage Integration: Direct integration with coverage tools to show exact line-by-line gaps
2. Test Generation: Ability to auto-generate test skeletons based on identified gaps
3. Pattern Recognition: Better recognition of common testing patterns in the codebase
4. Dependency Analysis: Understanding of complex dependency chains in large codebases

This PR significantly improves the robustness and reliability of the challengeHostTeamsCtrl tests while maintaining code quality standards.