fix(portfolio): truncate long match addresses; hide Needs attention tab when empty

- MatchAddress: long OS addresses overflowed the candidate row (text column
  wasn't width-constrained). Give it min-w-0 flex-1 and truncate both lines
  (full address on hover) so the dialog layout holds.
- PortfolioTabs: when nothing is unmatched, render just the properties table
  with no tab strip (the "Needs attention" tab only appears when count > 0).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/app/portfolio/[slug]/components/MatchAddress.tsx

@@ -188,11 +188,14 @@ export default function MatchAddress({
                                   isSelected ? "text-amber-600" : "text-gray-200"
                                 }`}
                               />
-                              <span className="min-w-0">
-                                <span className="block truncate text-gray-800">
+                              <span className="min-w-0 flex-1">
+                                <span
+                                  className="block truncate text-gray-800"
+                                  title={c.address}
+                                >
                                   {c.address}
                                 </span>
-                                <span className="text-[11px] text-gray-500">
+                                <span className="block truncate text-[11px] text-gray-500">
                                   UPRN {c.uprn} · {label}
                                   {c.alreadyInPortfolio
                                     ? " · already in portfolio"

src/app/portfolio/[slug]/components/PortfolioTabs.tsx

@@ -18,6 +18,9 @@ export default function PortfolioTabs({
 }) {
   const [tab, setTab] = useState<"properties" | "needs-attention">("properties");
 
+  // Nothing unmatched → no tab strip at all, just the properties table.
+  if (needsAttentionCount === 0) return <>{properties}</>;
+
   return (
     <div>
       <div className="mb-4 flex items-center gap-1 border-b border-gray-200">