feat: Revamp internal text selection

[marc2332]

Fixes #623

[codecov]

Codecov Report

Attention: Patch coverage is 75.75758% with 32 lines in your changes are missing coverage. Please review.

Project coverage is 73.40%. Comparing base (2671d6f) to head (65d8885).

Files	Patch %	Lines
crates/hooks/src/use_editable.rs	78.57%	12 Missing ⚠️
crates/hooks/src/text_editor.rs	15.38%	11 Missing ⚠️
crates/renderer/src/app.rs	0.00%	4 Missing ⚠️
crates/hooks/src/rope_editor.rs	88.46%	3 Missing ⚠️
crates/renderer/src/event_loop.rs	0.00%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #647   +/-   ##
=======================================
  Coverage   73.40%   73.40%           
=======================================
  Files         194      194           
  Lines       19580    19583    +3     
=======================================
+ Hits        14372    14375    +3     
  Misses       5208     5208           

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