feat: presence sync engine integrations

[ricardogarim]

Proposed changes

Integrates the presence sync engine into calendar, voice call, and video conference services, replacing direct DB status updates with the unified Presence.setActiveState() / Presence.endActiveState() API.

Voice calls

• Listens to callActivated / callEnded events from CallDirector to set/clear busy presence
• Sets "On a call" status text with statusSource: 'internal' (highest priority)
• Adds callActivated and callEnded event types to MediaCallServerEvents

Video conferences

• Sets "In a meeting" busy status when a user joins a video conference
• Clears presence state when the conference ends
• Uses statusSource: 'internal' (highest priority)

Calendar

• Replaces the entire applyStatusChange flow and previousStatus tracking with a single Presence.setActiveState() call using statusSource: 'external'
• Removes end-time scheduling — the engine handles expiration via statusExpiresAt
• Deletes applyStatusChange.ts and related test files (~550 lines removed)
• Removes previousStatus field from ICalendarEvent

Issue(s)

• PRES-26
• PRES-27

Steps to test or reproduce

See the use case matrix for the full set of scenarios.

Further comments

Depends on #40469 (frontend) and #40274 (backend engine).

This is the final PR in the stack. After this, all presence writers (manual, calendar, voice, video) go through the unified engine, and direct DB writes for status are fully eliminated.

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[codecov]

Codecov Report

❌ Patch coverage is 80.00000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 69.57%. Comparing base (242cc8e) to head (05b4e89).

Additional details and impacted files

@@                       Coverage Diff                       @@
##           feat/presence-expiration-ui   #40557      +/-   ##
===============================================================
- Coverage                        69.59%   69.57%   -0.02%     
===============================================================
  Files                             3330     3330              
  Lines                           123257   123220      -37     
  Branches                         21943    21965      +22     
===============================================================
- Hits                             85779    85731      -48     
- Misses                           34132    34141       +9     
- Partials                          3346     3348       +2     

Flag	Coverage Δ
unit	70.28% <80.00%> (-0.01%)	⬇️

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