feat: add text screenshot capability to Screenshot command

[wesen]

Extends the Screenshot command to support capturing terminal content as
plain text in addition to the existing PNG image format.

Usage

# Capture visual screenshot
Screenshot output.png

# Capture text content
Screenshot output.txt

[caarlos0]

Hey @wesen

can you elaborate on what's your use case for this? You got me curious :)

[joshka]

Hey @wesen

can you elaborate on what's your use case for this? You got me curious :)

I'm not @wesen, but I can see significant value in this idea for the following 2 use cases:

• creating end user docs that are validated to be exactly the same as the output of some cli / tui app
• outputting values that can be used for snapshot testing for end-to-end testing situations

[joshka]

Missing docs for .ansi

[wesen]

will add!

[wesen]

@joshka @caarlos0 yes that's exactly my usecase. I use it very often for LLM agents to snapshot intermediate steps either for their own sake, or for me to verify they actually implemented what I wanted.