Add an override method to highlight/copy text

[taranlu-houzz]

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No response

Describe the solution you'd like?

There are some combinations of fish, subshell, tmux, ssh, etc. that make it so that copying text to the system clipboard does not work. Other terminal emulators allow for an escape hatch key combination that lets the user highlight and copy what they want (e.g. for `kitty`, I can use `shift+<click and drag highlight>` to select some text and guarantee that it will be copied; `alacritty` has a vi based selection mode that is actually even better).

Is your feature request related to a problem? Please describe.

I am unable to copy text to the system clipboard in this specific situation:
- Run `fish` in a subshell (`warp` does not currently support `fish` abbreviations properly, so in order to get access to those, I just use a subshell, which means that everything I do happens in a single block until I exit the subshell).
- Connect to a `tmux` session on my machine.
- `ssh` to a remote server and connect to a `tmux` session on that machine.
- I am then unable to copy text from the terminal by highlighting it.

Additional context

No response

[elviskahoro]

This wuold be great for ergonomics! Thanks again @taranlu-houzz