refactor: overlay events

[PhearZero]

ℹ Overview

Split this into two PRs due to the size of the changes.

• refactors ModalEvent to KeySelectedEvent to avoid confusion
• removes Type from ModalEvent in favor of the more discrete ShowModal(ModalType)
• refactors modal to overlay
• allows event propagation to the child modals

Related Issues

• blocked by refactor: modals #136

[codecov]

Codecov Report

Attention: Patch coverage is 74.13793% with 45 lines in your changes missing coverage. Please review.

Project coverage is 43.29%. Comparing base (6b04f44) to head (c50f7fc).

Files with missing lines	Patch %	Lines
ui/viewport.go	57.14%	19 Missing and 2 partials ⚠️
ui/overlay/controller.go	76.74%	9 Missing and 1 partial ⚠️
ui/modals/transaction/controller.go	25.00%	6 Missing ⚠️
ui/modals/transaction/view.go	0.00%	4 Missing ⚠️
ui/app/accounts.go	40.00%	2 Missing and 1 partial ⚠️
cmd/root.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@                 Coverage Diff                  @@
##           refactor/modals     #139       +/-   ##
====================================================
+ Coverage            33.14%   43.29%   +10.14%     
====================================================
  Files                   76       77        +1     
  Lines                 6393     6329       -64     
====================================================
+ Hits                  2119     2740      +621     
+ Misses                4160     3358      -802     
- Partials               114      231      +117     

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