chore: prepare 1.0.0-beta.7

[skjnldsv]

Version bump and changelog for 1.0.0-beta.7: saving a copy behind canSaveAs (#73), which the viewer needs to bring back the save-as-copy of its old editor.

👾 This pull request was assisted by Claude Code, commits carry an Assisted-by trailer.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 45.07%. Comparing base (eae87f3) to head (8719a27).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #74   +/-   ##
=======================================
  Coverage   45.07%   45.07%           
=======================================
  Files          57       57           
  Lines        5085     5085           
  Branches      497      497           
=======================================
  Hits         2292     2292           
  Misses       2790     2790           
  Partials        3        3           

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