Updating Tutor Times Feature documentation

[rammakablecode]

Description

This PR provides a comprehensive update to the project's documentation suite, specifically focusing on the Tutor Times / Session Tracking feature. It transitions the documentation from the legacy manual-timer requirements to the finalized Automated Sticky Session architecture implemented in the 10.0.x release.

Key Changes:

• Backend & Frontend Design Docs: Updated to reflect the passive tracking logic, 15-minute inactivity threshold, and the use of ngx-charts for visualization.
• New Handover Document: Added ANALYTICS_HANDOVER.md to guide future developers on known logic constraints (rounding, assessment inflation) and the roadmap for the next trimester.

Type of change

• Documentation (update or new)

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can
reproduce. Please also list any relevant details for your test configuration

Testing Checklist

• Have run npm run format
• Have run npm run build
• Have run npm run dev and/or npm run preview, using:
  • Chrome

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have made corresponding changes to the documentation
• My changes generate no new warnings

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[SteveDala]

@rammakablecode please review the following errors from Vale, mostly changing American English spellings to British English:

> vale src/content/docs --minAlertLevel error

 src/content/docs/Products/OnTrack/Projects/Tutor Times/Documentation/T3 2025 Handover.md
 17:4  error  Use the British spelling        thothtech.American 
              "behaviour" instead of the                         
              American "Behavior".                               

 src/content/docs/Products/OnTrack/Projects/Tutor Times/Documentation/design-back-end.md
 72:32  error  Use "parameters" instead of     thothtech.Substitutions 
               "params".                                               
 86:11  error  Use the British spelling        thothtech.American      
               "authorised" instead of the                             
               American "Authorized".                                  
 91:30  error  Use the British spelling        thothtech.American      
               "authorised" instead of the                             
               American "Authorized".                                  
 92:20  error  Use the British spelling        thothtech.American      
               "authorisation" instead of the                          
               American "Authorization".                               

✖ 5 errors, 0 warnings and 0 suggestions in 160 files.