Add repo sidebar activity cards for PRs, issues, and discussions

[stylessh]

Summary

• Adds a side panel outside the main content card on the repo overview page with floating activity cards showing the latest 5 open PRs, issues, and discussions (when enabled)
• Portal-based architecture lets any page inject content into the layout-level side panel slot without coupling to the layout
• Animated show/hide with spring-based width transition and a toggle button on the content card edge
• Open counts fetched cheaply via per_page=1 + Link header parsing (REST) and GraphQL totalCount (discussions), with issue count corrected to exclude PRs
• New types: DiscussionSummary, DiscussionsResult, and RepoOverview extended with openPullCount, openIssueCount, hasDiscussions

Test plan

• Navigate to a repo overview page and verify PR, issue, and discussion cards appear in the right sidebar
• Verify counts match GitHub's actual open PR/issue/discussion counts
• Toggle the sidebar with the arrow button on the card edge — animation should be smooth
• Navigate away from the repo page and verify the sidebar disappears
• Test on a repo without discussions enabled — discussion card should not render
• Test on xl and smaller breakpoints — sidebar should only show on xl+

[cloudflare-workers-and-pages]

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	diffkit	cdf9b42	Commit Preview URL Branch Preview URL	Apr 12 2026, 09:50 PM