feat(training): Add edit functionality for training module

[waylonkenning]

Summary

This PR implements editable training articles as requested in #180, allowing department admins to modify training content after creation.

Fixes #180

Changes

New Features

• Edit Training Page: Department admins can now edit training name, description, training text, minimum score, and due date
• Attachment Management: Existing attachments are preserved and new attachments can be added
• User Assignment: Shows currently assigned users; allows adding new users, groups, or roles (existing assignments preserved)
• Question Editor: Full editing of questions and answers with correct answer selection

Files Added

• Tests/Resgrid.Tests/Mocks/MockTrainingRepository.cs - In-memory repository for unit tests
• Tests/Resgrid.Tests/Mocks/MockTrainingAttachmentRepository.cs - Mock for attachment queries
• Tests/Resgrid.Tests/Mocks/MockTrainingQuestionRepository.cs - Mock for question queries
• Tests/Resgrid.Tests/Mocks/MockTrainingUserRepository.cs - Mock for user assignment queries
• Tests/Resgrid.Tests/Services/TrainingServiceTests.cs - 15 unit tests for service layer
• Web/Resgrid.Web/Areas/User/Models/Training/EditTrainingModel.cs - View model
• Web/Resgrid.Web/Areas/User/Views/Trainings/Edit.cshtml - Edit form view
• Web/Resgrid.Web/wwwroot/js/app/internal/training/resgrid.training.edittraining.js - JavaScript for edit page

Files Modified

• Web/Resgrid.Web/Areas/User/Controllers/TrainingsController.cs - Added Edit GET/POST actions
• Web/Resgrid.Web/Areas/User/Views/Trainings/Index.cshtml - Added Edit button for admins

Issue Requirements Addressed

From #180:

Requirement	Status	Notes
Edit training articles	✅ Done	Admins can edit all training fields
Preserve questions when editing	✅ Done	Questions/answers preserved and editable
Add users/groups/roles after creation	✅ Done	Can add assignments to existing training

Future Enhancements (Not in this PR)

• Notification system when training updated
• Revision history tracking

Testing

Unit Tests (15 tests)

• GetTrainingByIdAsync - Returns training with questions/attachments
• GetAllTrainingsForDepartmentAsync - Filters by department
• SaveAsync - Create/update with questions, HTML sanitization
• DeleteTrainingAsync - Removes training
• SetTrainingAsViewedAsync - Marks viewed, auto-completes when no questions
• RecordTrainingQuizResultAsync - Records score and completion
• ResetUserAsync - Resets user progress
• GetTrainingUsersForUserAsync - Gets user's assigned trainings

Manual Testing Checklist

• Edit button appears on training index (admin only)
• Form pre-populates with existing data
• Existing attachments shown as download links
• New attachments added without removing existing
• Existing user assignments preserved, new users can be added
• Questions and answers editable, correct answer selectable
• Authorization: non-admins receive 401 Unauthorized
• NotFound for non-existent training

Screenshots

Edit button added to training index page next to Report and Delete buttons for department admins

Edit form pre-populates all existing training data including attachments, questions, and user assignments

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