add reusable TUI editor view

[harryalbert]

Description

Linked Issue

• The linked issue is labeled ready-to-spec or ready-to-implement.
• Where appropriate, screenshots or a short video of the implementation are included below (especially for user-visible or UI changes).

Testing

• I have manually tested my changes locally with ./script/run

Screenshots / Videos

Agent Mode

• Warp Agent Mode - This PR was created via Warp's AI Agent Mode

[harryalbert]

• add reusable TUI option selector over shared option snapshots #13716 : 2 dependent PRs (#13717 , #13830 )
• add reusable TUI editor view #13817 👈 (View in Graphite)
• route TUI editor input by owning-view focus #13771
• add option snapshots and adapt GUI orchestration pickers onto them #13714
• extract orchestration edit state into a frontend-neutral module #13707
• master

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@harryalbert

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[oz-for-oss]

Overview

This PR adds a reusable single-line TUI editor view and refactors TUI input/editor keybindings through a shared command table.

Concerns

• The new reusable editor does not keep its char-cell viewport following the cursor after edits or movement, so long single-line content can disappear once it wraps beyond the first visible row.

Verdict

Found: 0 critical, 1 important, 0 suggestions

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[moirahuang]

thanks so much for splitting up the PRs + adding the mermaid diagram! it made it way easier to review + the split between TuiInput and TuiEditor feels a lot more clean now