feat: local review UI parity

[sam-phinizy]

Summary

• Adds Approve and Request changes buttons to the ReviewWorkspaceHeader for local review sessions, matching the GitHub PR review experience
• Moves the Help button to the right side of the header

Test plan

• Trigger a local review session (redpen open --wait or pre-push hook)
• Verify Approve / Request changes buttons appear in the header
• Verify Help button is on the right
• Verify GitHub PR review header is unchanged

🤖 Generated with Claude Code

[Copilot]

Pull request overview

Adds local review header controls to match the GitHub PR review experience and adjusts header layout.

Changes:

• Added Approve / Request changes actions for local review sessions in ReviewWorkspaceHeader
• Moved Help button to the right side of the header
• Added success/danger button styling for the new local-review actions

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[Copilot]

handleLocalReviewVerdict always submits the verdict for reviewSession.files[0]. In local review sessions with multiple files, this can submit/POST annotations for an arbitrary file rather than the file currently being reviewed. Consider using the editor's current file path (as EditorPane.svelte does) or otherwise ensuring the verdict is submitted for the intended file(s) instead of always the first entry.

Suggested change

	const file = reviewSession.files[0];
	if (!file) return;
	await submitReviewVerdict(file, verdict);
	const files = reviewSession.files;
	if (!files || files.length === 0) return;
	for (const file of files) {
	await submitReviewVerdict(file, verdict);
	}

[Copilot]

This change introduces new local-review actions (Approve / Request changes) and new visual styling, but there are no component-level tests covering the local review session header state. Given other components have Testing Library/Vitest coverage (e.g., src/components/EditorPane.test.ts), add tests to verify the buttons render when reviewSession.active is true and that clicking them calls submitReviewVerdict and clears the session.

Suggested change

	<button type="button" class="review-summary-btn review-summary-btn-success" onclick={() => void handleLocalReviewVerdict("approved")}>
	Approve
	</button>
	<button type="button" class="review-summary-btn review-summary-btn-danger" onclick={() => void handleLocalReviewVerdict("changes_requested")}>
	<button
	type="button"
	class="review-summary-btn review-summary-btn-success"
	data-testid="local-review-approve-button"
	onclick={() => void handleLocalReviewVerdict("approved")}
	>
	Approve
	</button>
	<button
	type="button"
	class="review-summary-btn review-summary-btn-danger"
	data-testid="local-review-request-changes-button"
	onclick={() => void handleLocalReviewVerdict("changes_requested")}
	>