Added a link from each opportunity to its latest Find a Tender notice

Opportunities from Find a Tender have a link icon before their title.
Clicking it fetches the opportunity with its releases (the list leaves
them out) and opens its newest release's notice,
www.find-tender.service.gov.uk/notice/<release_id>, in a new tab. The
tab is opened on the click and pointed at the notice when the request
returns, so it isn't blocked as a popup; if the request fails, or there
are no releases, it's closed and a toast says why. Opportunities from
other sources have no link for now, but keep its space so the titles
line up.

The icon is lucide-solid's, added for it at 1.52.0.

web/src/App.tsx

@@ -67,7 +67,15 @@ export function App(): JSX.Element {
       />
 
       <main>
-        <Switch fallback={<OpportunityTable opportunities={rows()} annotations={annotations} />}>
+        <Switch
+          fallback={
+            <OpportunityTable
+              opportunities={rows()}
+              annotations={annotations}
+              onError={toasts.show}
+            />
+          }
+        >
           <Match when={opportunities.isLoading() && opportunities.items().length === 0}>
             <p class={`${statePanel} text-muted`}>Loading opportunities…</p>
           </Match>