Add a "🔒" hint to untrusted notebooks

[mwouts]

The static preview's small, linked "ⓘ" marker introduced in v2.9.0 is now preceded by a "🔒" hint specifically when the notebook you're viewing isn't trusted - explaining that trusting it will restore the interactive table. It's wrapped in a <noscript> element so it only shows up in that actionable case: it stays hidden once the notebook is trusted, and on read-only renders (e.g. GitHub's .ipynb preview) where trusting isn't available anyway.

[github-actions]

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Also, the version of ITables developed in this PR is available as a wheel artifact 📦 for easy installation.
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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.23%. Comparing base (64e336b) to head (cf8ad14).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #606   +/-   ##
=======================================
  Coverage   95.22%   95.23%           
=======================================
  Files          59       59           
  Lines        3710     3716    +6     
=======================================
+ Hits         3533     3539    +6     
  Misses        177      177           

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