feat(ts): capitalize words in event handlers

[LuLaValva]

• Since event handlers of the on[A-Z] form are case-insensitive, this casing is preferred.

[changeset-bot]

🦋 Changeset detected

Latest commit: c049b87

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 3 packages

Name	Type
@marko/runtime-tags	Patch
marko	Patch
@marko/translator-interop-class-tags	Patch

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.17%. Comparing base (ba755a5) to head (c049b87).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2469   +/-   ##
=======================================
  Coverage   87.17%   87.17%           
=======================================
  Files         351      351           
  Lines       39920    39920           
  Branches     2589     2589           
=======================================
  Hits        34799    34799           
  Misses       5095     5095           
  Partials       26       26           

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