Revert "fix: remove flutter overlay (#358)"

[LucasXu0]

This reverts commit 81fbb40.

[LucasXu0]

before

after

This commit affects the position of the selection menu. Revert it temporarily.

[codecov]

Codecov Report

Merging #427 (9e110bd) into main (836e4cb) will decrease coverage by 0.72%.
The diff coverage is 57.61%.

@@            Coverage Diff             @@
##             main     #427      +/-   ##
==========================================
- Coverage   80.39%   79.67%   -0.72%     
==========================================
  Files         272      273       +1     
  Lines       11067    11395     +328     
==========================================
+ Hits         8897     9079     +182     
- Misses       2170     2316     +146     

Files Changed	Coverage Δ
...ib/src/editor/editor_component/service/editor.dart	92.85% <ø> (ø)
...ditor/editor_component/service/editor_service.dart	100.00% <ø> (ø)
...nt/service/selection/mobile_selection_service.dart	14.28% <0.00%> (-0.06%)	⬇️
...or/editor_component/service/selection_service.dart	100.00% <ø> (ø)
...or_component/service/selection_service_widget.dart	71.05% <ø> (ø)
lib/src/flutter/scrollable_helpers.dart	27.12% <ø> (ø)
lib/src/render/toolbar/toolbar_item.dart	82.60% <ø> (ø)
lib/src/flutter/overlay.dart	57.79% <57.79%> (ø)
...t/service/selection/desktop_selection_service.dart	86.30% <100.00%> (ø)

... and 5 files with indirect coverage changes