TDT-2791 Clarify event visibility default is Google-only

[samLRodrigues]

What

Updates the JSDoc for the Visibility type in src/models/events.ts to note that default only works for Google events. Microsoft and EWS accounts return a 400 error when default is sent, but the type declaration didn't warn about this.

Jira: TDT-2791 (sub-task of TDT-2765)

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.75%. Comparing base (d5a47c6) to head (62da1b6).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #754   +/-   ##
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  Coverage   98.75%   98.75%           
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  Files          43       43           
  Lines        1041     1041           
  Branches       90       90           
=======================================
  Hits         1028     1028           
  Misses         12       12           
  Partials        1        1           

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[AaronDDM]

Good afternoon! Thanks for tightening this up — the note is accurate and the provider-specific 400 behaviour is worth calling out. One thing before this ships: there's no entry under the Unreleased section in CHANGELOG.md. Please add a short line under Changed (e.g. "Clarify that event default visibility is Google-only") so the doc fix is tracked. Docs themselves look good.

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