fix(vscode): load initial diff previews

[marius-kilocode]

Expanded review files can remain stuck on the on-demand placeholder when summarized diff data is already available before the review surface mounts. The detail-request effect deferred its first callback, so no request was sent until another interaction, such as collapsing and reopening the file, changed the accordion state.\n\nRun initial detail scheduling for already-expanded summaries and share the request lifecycle between inline and full-screen review surfaces. Requests remain deduplicated by file revision, reset when a file is reopened or the review context changes, and resume when an existing loading state clears.

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

The extraction of createDiffRequests into a shared diff-viewer/diff-requests.ts hook is a clean, well-tested fix. The key change — dropping the { defer: true } option on the effect that scans open/diffs/loading and issues detail requests — correctly addresses the described bug where already-expanded summarized diffs never triggered an initial request. The new key-clear effect stays deferred (correct, since the request map starts empty) and is created before the request effect, so requested is cleared before the request effect re-runs on a session-key change. Both DiffPanel.tsx and FullScreenDiffView.tsx now share identical logic, and the added test exercises the real implementation (initial request, dedup on unchanged diff, retry on reopen, new-session retry, and resuming after an existing loading state clears) rather than duplicating the logic. The changeset is concise and user-facing.

Files Reviewed (5 files)

• .changeset/load-initial-diff-previews.md
• packages/kilo-vscode/tests/unit/diff-preview-request.test.ts
• packages/kilo-vscode/webview-ui/agent-manager/DiffPanel.tsx
• packages/kilo-vscode/webview-ui/diff-viewer/FullScreenDiffView.tsx
• packages/kilo-vscode/webview-ui/diff-viewer/diff-requests.ts

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_{Reviewed by claude-sonnet-5-20260630 · Input: 30 · Output: 12.7K · Cached: 816.6K}

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