feat(ui): show labels when focused on a session/item

[dgershman]

Summary

• Adds GitHub/GitLab label display to SessionDetailView (header), SessionRow (sidebar), and ReviewRow (review board) so users get at-a-glance label context without switching to a browser
• Extracts a reusable LabelPillsView component from the existing TicketCard.labelRow pattern, and refactors TicketCard to use it — eliminating code duplication across 4 views
• Adds reverse-lookup helpers on AppState (assignedIssue(for:), reviewRequest(for:), labels(forSession:)) to resolve labels from the existing AssignedIssue/ReviewRequest data without adding new fields to the Session model

Test plan

• Select a session linked to a ticket with labels — labels appear in the detail header below the ticket title
• Labels appear in the sidebar session row (hidden when "hide details" is toggled)
• Review board rows now show PR labels
• Ticket board cards still display labels correctly (refactor preserved behavior)
• Sessions without tickets show no labels and no empty space
• All 160 CrowCore unit tests pass (including 8 new lookup tests)

Closes #268

🤖 Generated with Claude Code

[dhilgaertner]

Code & Security Review

Critical Issues

None.

Security Review

Strengths:

• No new external input surface — labels are sourced from already-fetched AssignedIssue / ReviewRequest models and rendered via SwiftUI Text, so no injection vectors are introduced.
• No new persisted fields, no secrets, no auth surface touched.
• The reverse-lookup helpers are read-only and @MainActor-safe (consistent with the rest of AppState).

Concerns:

• None.

Code Quality

Strengths:

• The LabelPillsView extraction (Packages/CrowUI/Sources/CrowUI/CorveilTheme.swift:181) is a clean dedup of the prior TicketCard.labelRow body — same fonts, padding, capsule, overflow +N, and muted flag mapping isDone. The refactor at Packages/CrowUI/Sources/CrowUI/TicketBoardView.swift:501 is behavior-preserving.
• Reverse lookup via existing data avoids a stale duplicate of labels on Session — good call.
• Test coverage in Packages/CrowCore/Tests/CrowCoreTests/AppStateLookupTests.swift exercises the positive path, missing ticket URL, no-match, kind filtering, and the issue-vs-review fallback. All 160 tests pass locally.

Consider (non-blocking):

• Packages/CrowCore/Sources/CrowCore/AppState.swift:412 — reviewRequest(for:) guards on session.kind == .review, but assignedIssue(for:) at line 406 does not guard on kind. A .review session that happens to have a non-nil ticketURL matching an assigned issue would fall into the issue branch of labels(forSession:) and show issue labels instead of PR labels. Probably fine in practice (review sessions typically don't carry an issue ticketURL), but worth a brief comment or a kind-aware preference if mixed states are possible.
• Packages/CrowUI/Sources/CrowUI/CorveilTheme.swift:194 — Text(label) has no .lineLimit(1)/.truncationMode. GitHub allows up to 50-char labels; in narrow contexts (SessionRow sidebar, maxVisible: 2) very long labels could push siblings or wrap. This is preserved from the original TicketCard.labelRow, so not a regression — flagging only.
• Lookups are O(n) over assignedIssues / reviewRequests per render of each row. Fine at current scale; if these collections grow large, an index keyed by URL would help.
• Minor: the helper named pair assignedIssue(for:) / reviewRequest(for:) use for:, while labels(forSession:) uses forSession:. Not actionable (likely avoiding a label collision), but slightly inconsistent.

Summary Table

Priority	Issue
Red	(none)
Yellow	(none)
Green	Optional .lineLimit(1) on label Text for narrow contexts; consider kind-aware preference in labels(forSession:) if review sessions can carry a ticketURL; consider a URL-keyed index if assignedIssues/reviewRequests grow.

Recommendation: Approve. Scope is tight, the refactor is behavior-preserving, test coverage for the new lookups is solid, and there are no security or correctness concerns. The items above are minor consider-level polish, not blockers.

🤖 Reviewed by Crow via Claude Code