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/routes/analytics.js

@@ -173,7 +173,7 @@ export function register(app) {
     const { isBot } = detectBot(ua)
     if (isBot) { res.json({ ok: false, reason: 'bot' }); return }
     const type = typeof req.body?.type === 'string' ? req.body.type : ''
-    const ALLOWED_TYPES = ['scroll_depth', 'time_on_page', 'outbound_click', 'utm', 'search_query', 'not_found', 'audio_pause', 'audio_completion', 'audio_listen_time']
+    const ALLOWED_TYPES = ['scroll_depth', 'time_on_page', 'outbound_click', 'link_click', 'utm', 'search_query', 'not_found', 'audio_pause', 'audio_completion', 'audio_listen_time']
     if (!ALLOWED_TYPES.includes(type)) { res.status(400).json({ ok: false, reason: 'invalid-type' }); return }
     recordAnalyticsEvent(type, req.body)
     res.json({ ok: true })
@@ -378,6 +378,10 @@ export function register(app) {
           .map(([url, count]) => ({ url, count }))
           .sort((a, b) => b.count - a.count)
           .slice(0, 20),
+        topLinkClicks: Object.entries(state.analyticsEvents.linkClicks ?? {})
+          .map(([url, { count, internal }]) => ({ url, count, internal }))
+          .sort((a, b) => b.count - a.count)
+          .slice(0, 50),
         topUTMSources: Object.entries(state.analyticsEvents.utmSources ?? {})
           .map(([source, count]) => ({ source, count }))
           .sort((a, b) => b.count - a.count),