Fix: board iframe page event

[chenshenhai]

• fix: board iframe page event

[codecov-commenter]

Codecov Report

Merging #110 (705fdb3) into main (0e4ae3a) will not change coverage.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##             main     #110   +/-   ##
=======================================
  Coverage   39.07%   39.07%           
=======================================
  Files          65       65           
  Lines        2480     2480           
  Branches      527      527           
=======================================
  Hits          969      969           
  Misses       1128     1128           
  Partials      383      383           

Flag	Coverage Δ
unittests	39.07% <0.00%> (ø)

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Impacted Files	Coverage Δ
packages/board/src/lib/screen-watcher.ts	21.48% <0.00%> (ø)

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