feat(talk_app): Add reactions overview dialog

[provokateurin]

Closes #2092

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 28.90%. Comparing base (0ba2f5f) to head (ececdc4).
Report is 17 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2625      +/-   ##
==========================================
+ Coverage   28.86%   28.90%   +0.03%     
==========================================
  Files         370      371       +1     
  Lines      136544   136616      +72     
==========================================
+ Hits        39411    39483      +72     
  Misses      97133    97133              

Flag	Coverage Δ		*Carryforward flag
account_repository	98.47% <ø> (ø)
cookie_store	99.48% <ø> (ø)		Carriedforward from 0ba2f5f
dashboard_app	96.05% <ø> (ø)
dynamite	31.05% <ø> (ø)		Carriedforward from 0ba2f5f
dynamite_end_to_end_test	61.69% <ø> (ø)		Carriedforward from 0ba2f5f
dynamite_runtime	85.40% <ø> (ø)		Carriedforward from 0ba2f5f
interceptor_http_client	97.18% <ø> (ø)		Carriedforward from 0ba2f5f
neon_dashboard	96.05% <ø> (ø)		Carriedforward from 0ba2f5f
neon_framework	61.43% <ø> (+0.09%)	⬆️
neon_http_client	93.61% <ø> (ø)		Carriedforward from 0ba2f5f
neon_notifications	100.00% <ø> (ø)		Carriedforward from 0ba2f5f
neon_storage	94.66% <ø> (ø)		Carriedforward from 0ba2f5f
neon_talk	99.45% <ø> (ø)		Carriedforward from 0ba2f5f
nextcloud	24.33% <ø> (ø)		Carriedforward from 0ba2f5f
notifications_app	97.40% <ø> (ø)
notifications_push_repository	98.11% <ø> (ø)
sort_box	90.90% <ø> (ø)		Carriedforward from 0ba2f5f
talk_app	99.00% <100.00%> (+0.06%)	⬆️

*This pull request uses carry forward flags. Click here to find out more.

Files with missing lines	Coverage Δ
...ework/packages/talk_app/lib/src/utils/helpers.dart	100.00% <100.00%> (ø)
...k/packages/talk_app/lib/src/widgets/reactions.dart	100.00% <100.00%> (ø)
...app/lib/src/widgets/reactions_overview_dialog.dart	100.00% <100.00%> (ø)