feat: add review status icon and merge status indicator to PR list rows

Add per-PR review state aggregation by fetching reviews concurrently
via the existing semaphore pattern. Display review status (approved,
changes requested, awaiting) and merge status (ready/conflicts) as
compact badges in each PR card row.

- Add ReviewState field to PullRequest struct
- Add GetPullReviewState() and EnrichPullsWithReviewState() to client
- Call enrichment in ListPulls handler after fetching PRs
- Update pulls template with review and merge badges
- Add CSS for .review-badge and .merge-badge classes

Closes leeworks-agents/gitea-mobile#97

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

internal/handlers/handlers.go

@@ -412,6 +412,10 @@ func (h *Handler) ListPulls(w http.ResponseWriter, r *http.Request) {
 			if result.HasMore {
 				data.NextPage = page + 1
 			}
+			// Enrich PRs with review state for status icons.
+			if len(data.Pulls) > 0 {
+				h.Client.EnrichPullsWithReviewState(r.Context(), token, data.Pulls)
+			}
 		}
 	}