Track all link clicks (internal + external) in analytics; v1.1.33

Replaces outbound-only tracking with a useLinkClickTracking hook that
captures every <a> click on the site. Stores as link_click events keyed
by destination URL, with an internal flag. Admin analytics page gains a
Link Clicks table sorted by count, showing type (internal/external).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

server/data.js

@@ -850,6 +850,7 @@ const EMPTY_ANALYTICS_EVENTS = {
   scrollDepth: {},
   timeOnPage: {},
   outboundClicks: {},
+  linkClicks: {},
   utmSources: {},
   searchQueries: {},
   notFound: {},
@@ -875,6 +876,7 @@ export function loadAnalyticsEventsFromDisk() {
         scrollDepth: parsed?.scrollDepth ?? {},
         timeOnPage: parsed?.timeOnPage ?? {},
         outboundClicks: parsed?.outboundClicks ?? {},
+        linkClicks: parsed?.linkClicks ?? {},
         utmSources: parsed?.utmSources ?? {},
         searchQueries: parsed?.searchQueries ?? {},
         notFound: parsed?.notFound ?? {},
@@ -902,6 +904,12 @@ export function recordAnalyticsEvent(type, data) {
   } else if (type === 'outbound_click') {
     const url = typeof data.url === 'string' ? data.url.slice(0, 500) : ''
     if (url) ev.outboundClicks[url] = (ev.outboundClicks[url] ?? 0) + 1
+  } else if (type === 'link_click') {
+    const url = typeof data.url === 'string' ? data.url.slice(0, 500) : ''
+    if (url) {
+      if (!ev.linkClicks[url]) ev.linkClicks[url] = { count: 0, internal: data.internal === true }
+      ev.linkClicks[url].count += 1
+    }
   } else if (type === 'utm') {
     const source = typeof data.utm_source === 'string' ? data.utm_source.slice(0, 100) : 'unknown'
     ev.utmSources[source] = (ev.utmSources[source] ?? 0) + 1