fix: remove post-render entity on handlebars

[jaredwray]

Please check if the PR fulfills these requirements

• Followed the Contributing and Code of Conduct guidelines.
• Tests for the changes have been added (for bug fixes/features) with 100% code coverage.

What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)
fix: remove post-render entity on handlebars

[gemini-code-assist]

Code Review

This pull request removes the ent and @types/ent dependencies and eliminates post-render entity decoding from the Handlebars engine. This aligns the engine with standard Handlebars semantics, where {{var}} HTML-escapes and {{{var}}} inserts raw HTML, preventing issues where legitimately escaped content was corrupted. Corresponding tests have been updated and new test cases added to verify correct escaping behavior. There are no review comments, so I have no feedback to provide.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (11c920a) to head (b32cc50).

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #379   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            9         9           
  Lines          413       409    -4     
  Branches        96        96           
=========================================
- Hits           413       409    -4     

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