Add Ctrl+J to toggle edit diffs independently of tool output

[snimu]

What this does

Adds Ctrl+J to show or hide edit diffs on their own, independent of Ctrl+O (tool output).

When the agent has made a few file edits in between many long tool calls, you can press Ctrl+J to see every edit's full diff — while all the noisy tool output stays collapsed. Ctrl+J is now the only switch for diffs: Ctrl+O still expands code and command output, but no longer shows or hides diffs. The two switches don't affect each other.

Why

Expanding tool output was the only way to see a diff in full. With long-running work that means wading through hundreds of lines of command output just to check a handful of edits.

How it works

• Every edit shows its one-line summary (path +N −M) with a dim (Ctrl+J to expand) hint next to it. With Ctrl+J on, the full diff renders in place of that summary — code and command output stay behind Ctrl+O.
• The switch follows the same pattern as the existing independent toggles (Ctrl+O tools, Ctrl+P agent messages, Ctrl+T thinking) and is remappable like every other keybinding.
• Default is off, and the choice isn't persisted between sessions, matching the other two expansion toggles.

Changes

• Diff rendering now keys off the new toggle alone, in both display paths: code cells (the usual case) and the classic built-in edit tool. The old "expand everything" overlap was removed, which simplified the display logic.
• Standard toggle plumbing: keybinding, hint texts, shortcuts panel, docs row.
• The edit summary line carries the Ctrl+J hint, following the existing hint style and only on the most recent tool, like other hints.
• Tests for the toggle in both paths, the hint, and the keybinding.

Lines changed (vs main): source +77/−11, tests +111/−9, docs and changelog +2/−0.

Checks

• npm run check clean; all touched test files pass (~260 tests across the areas).
• Validated end-to-end in a real terminal: 200-line noisy tool calls plus two edits — Ctrl+J shows just the diffs, off hides them, Ctrl+O expands code/output without touching diffs. Also verified Ctrl+J is received distinctly from Enter in tmux; terminals that can't send it can remap the binding.

Note

Add Ctrl+J to toggle edit diffs independently of tool output expansion

• Introduces a new app.edits.expand keybinding (ctrl+j) that toggles edit diff visibility separately from the general tool output expansion (ctrl+o).
• Adds an editDiffsExpanded state to ToolExecutionComponent, IPythonCellComponent, and InteractiveMode, decoupling diff display from the general expanded state.
• When edit diffs are collapsed, built-in edit and IPython tools show a FileChangeSummaryComponent with a ctrl+j hint; when expanded, full diffs render instead.
• The expand hint moves from the tool header to the summary line once a result is settled, avoiding duplication.
• Behavioral Change: IPython cell diffs and built-in edit diffs are now controlled by editDiffsExpanded rather than expanded, so collapsing tool output no longer hides diffs.

^{Macroscope summarized 77ea530.}

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Note

Low Risk
Interactive UI and keybinding behavior only; no auth, persistence, or file-mutation logic changes beyond how diffs are displayed.

Overview
Adds app.edits.expand (Ctrl+J) as a dedicated toggle for edit diff visibility, matching the pattern used for tool output (Ctrl+O), agent messages, and thinking blocks.

Ctrl+O no longer shows or hides diffs — built-in edit tools and IPython edit cells now drive diff rendering from editDiffsExpanded state in InteractiveMode, propagated via setEditDiffsExpanded on tool and conversation components. Collapsed edits still show the ╰─ path +N -M summary; full diffs appear only when this toggle is on, while Ctrl+O continues to control general tool/code expansion.

UI polish: the expand hint moves to app.edits.expand on the file-change summary line (header only before a settled result or on errors), with keybinding registration, shortcuts/help text, docs, and tests updated for both render paths.

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