feat(tui): Allow to expand pasted text (AKA "pasted summary")

[berenar]

What does this PR do?

Allows you to toggle the paste summary feature on and off to view and edit the contents of the pasted text.

This mainly fixes:

• [FEATURE]: Allow to expand the pasted text (e.g. [Pasted ~1 lines]) #8501

And helps with:

• feat: first party support for voice conversing #2425
• [FEATURE]: Speech-to-Text Voice Input for Lazy People in OpenCode #4695
• Text paste placeholders break speech-to-text input (accessibility) #1386
• Request for an option to disable pasting behavior when the text is a bit long #2551
• Pasting text in WezTerm on X11 Ubuntu always results in [Pasted ~X lines] #5687

Demo

demo_toggle_paste_sumary.mov

Why I created this PR

1. I love that pasted text is summarized to avoid bloating the prompt, but I usually want to edit it or at least view it before sending the prompt.
2. I know I can use my editor (leader + e) to edit text, but it's not as convenient for small edits.
3. I did not find any issues referencing this, and I know I should have created one first, but OpenCode has made it so easy to fix small quirks like this... so here I am :D
4. I created the issue after the PR: [FEATURE]: Allow to expand the pasted text (e.g. [Pasted ~1 lines]) #8501

Decisions taken

• The default state for it is the value of experimental.disable_paste_summary, if not available, it falls back to the current behavior (paste shows summary, not content)
• The default keybind for this is ctrl+o
• The name of this feature is "Paste summary" in order to be consistent with the existing experimental flag
• When expanding the pasted text, it remains highlighted in yellow
• When the cursor is in the middle of some expanded text and the user summarizes it, the cursor jumps right after "[Pasted ~1 lines]"

Things needed before merging

• Agreement on how to name this feature ("Paste summary?")
• UI decision on showing the expanded text as yellow or not (I like it but it can be too yellow)
• Agreement on the default keybind, or leave it unmapped

How did you verify your code works?

• Added unit tests
• bun dev and manually tested it the different use cases
  • 1 pasted text
  • Multiple pasted texts
  • Pasted text with no line breaks
  • Pasted text with line breaks
  • Edit the pasted text and summarise it back
  • Paste text, edit it, open the editor (leader e)

[github-actions]

Thanks for your contribution!

This PR doesn't have a linked issue. All PRs must reference an existing issue.

Please:

1. Open an issue describing the bug/feature (if one doesn't exist)
2. Add Fixes #<number> or Closes #<number> to this PR description

See CONTRIBUTING.md for details.

[github-actions]

The following comment was made by an LLM, it may be inaccurate:

No duplicate PRs found

[berenar]

Fixes #8501

[github-actions]

Closing this pull request because it has had no updates for more than 60 days. If you plan to continue working on it, feel free to reopen or open a new PR.