feat(ui): show line summaries for multi-file patches

[marius-kilocode]

Multi-file patch tool calls currently show only the number of affected files in their collapsed header, while the individual file rows expose their own line counts. This makes the overall size of a patch harder to assess without expanding the tool call.

The header now reuses the per-file diff metadata to show aggregate additions and deletions for the current tool call, while preserving the existing single-file presentation and per-file details. The summary is omitted when there are no line changes.

Before:

After:

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Files Reviewed (1 file)

• packages/kilo-ui/src/components/message-part.tsx

The follow-up commit resolves the earlier suggestion: the aggregate DiffChanges now renders through ToolChanges with animate={reveal()}, so it fades in alongside the sibling ToolText. Passing the slot through keeps data-slot="message-part-tool-changes" on the same single wrapper element, so the inline-flex layout and the basic-tool-tool-subtitle + ...::before separator dot still apply despite the span -> div swap, and data-slot is omitted for the other ToolChanges call sites where the prop is undefined.

Previous Review Summary (commit bbf4dff)

Current summary above is authoritative. Previous snapshots are kept for context only.

Previous review (commit bbf4dff)

Status: 1 Issue Found | Recommendation: Optional follow-up, safe to merge

Overview

Severity	Count
CRITICAL	0
WARNING	0
SUGGESTION	1

Issue Details (click to expand)

SUGGESTION

File	Line	Issue
packages/kilo-ui/src/components/message-part.tsx	2772	Aggregate DiffChanges is rendered without the reveal fade used by the adjacent ToolText and by the single-file ToolChanges path

Files Reviewed (3 files)

• packages/kilo-ui/src/components/message-part.tsx - 1 issue
• packages/kilo-ui/src/components/basic-tool.css - no issues (separator/flex-shrink handling matches the existing vscode-theme dot pattern)
• .changeset/bright-files-count.md - no issues

Notes: the some(...) guard correctly suppresses the stray separator dot when nothing changed, and DiffChanges already tolerates missing counts. Existing multi-file apply_patch story fixtures in tool-call-lab.stories.tsx cover the new header, so CI visual baselines should capture it without a new story.

Fix these issues in Kilo Cloud

---

_{Reviewed by claude-opus-5 · Input: 36 · Output: 5.3K · Cached: 715.8K}

_{Review guidance: REVIEW.md from base branch main}