Drop react-copy-to-clipboard dependency and add feedback to IdCopy

[cmil]

• Removes the react-copy-to-clipboard peer dependency (and its types) from
  IdCopy, replacing it with navigator.clipboard.writeText() via an onClick
  handler — no behaviour change for consumers, one fewer package to install.
• Adds visual copy feedback: the clipboard icon swaps to a check mark for 1.5s
  after clicking, then reverts.

Closes #63

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.09%. Comparing base (ebbea55) to head (14e4981).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #64      +/-   ##
==========================================
+ Coverage   93.97%   94.09%   +0.12%     
==========================================
  Files          31       31              
  Lines         282      288       +6     
  Branches       83       85       +2     
==========================================
+ Hits          265      271       +6     
  Misses          4        4              
  Partials       13       13              

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