feat(core): support copy as image in electron app

[akumatus]

Close issue AF-1785.

What changed?

• Support copy as image in electron app：
  • Select the whole mindmap if any of the mindmap nodes is selected.
  • Hide unselected overlap elements before taking a snapshot.
  • Fit the selected elements to the screen.
  • Add CSS style to hide irrelevant dom nodes, like widgets, whiteboard background and so on.
    • Due to the usage of Shadow Dom in our code, not all node styles can be controlled. Thus this PR use -2px padding for affine:frame snapshots.
  • Using electron capturePage API to take a snapshot of selected elements.

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[akumatus]

• feat(core): support copy as image in electron app #8939 👈 (View in Graphite)
• canary

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 64.68%. Comparing base (68337fa) to head (8d3d611).

Additional details and impacted files

@@            Coverage Diff             @@
##           canary    #8939      +/-   ##
==========================================
- Coverage   64.73%   64.68%   -0.06%     
==========================================
  Files         664      664              
  Lines       37346    37346              
  Branches     3608     3608              
==========================================
- Hits        24177    24157      -20     
- Misses      12802    12822      +20     
  Partials      367      367              

Flag	Coverage Δ
server-test	77.07% <ø> (-0.07%)	⬇️
unittest	34.57% <ø> (ø)

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