Add pasteCollapseThreshold setting to control or disable paste collapsing in the prompt

Summary

Claude Code's TUI collapses any pasted text into a [Pasted text #1 +N lines] placeholder. There's no setting to raise/lower the threshold or disable the behavior. Please add a pasteCollapseThreshold setting (line count, with 0 or false to disable collapsing entirely).

Motivation

The collapse behavior makes sense for large pastes, but it's painful in two real workflows:

1. Voice dictation tools (Wispr Flow, Whisper-based dictation, etc.) insert text via the system paste buffer. Even a 3–4 line dictation gets collapsed, so I can't see or proofread what was inserted before submitting. My current workaround is pressing Ctrl+G to pop the prompt into $EDITOR on every dictation — real friction when dictation is supposed to be the fast path.
2. Multi-line prompts composed in another editor and pasted in for a final once-over. I want to see them, not a placeholder.

Proposed setting

{
  "pasteCollapseThreshold": 20
}

• Integer: collapse pastes ≥ N lines, show shorter pastes inline.
• 0 or false: never collapse — always show pasted text inline.
• Default: current behavior (whatever the hardcoded threshold is today).

Alternative

A keybinding action like chat:expandPaste that toggles a single collapsed paste block in place would also solve case #1 — though a setting is simpler and serves both cases.

Environment

• Claude Code CLI on macOS
• Used heavily with Wispr Flow voice dictation