feat: add shared link referrer icon and new social platform icons

Add branded icons for WhatsApp, Telegram, Snapchat, Pinterest, Threads.
Add link icon for new "Shared Link" referrer category. Update changelog.

CHANGELOG.md

@@ -8,6 +8,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 
 ### Improved
 
+- **Smarter referrer attribution.** Traffic that arrives without a referrer on a deep page (like a blog post) is now shown as "Shared Link" instead of "Direct." Real direct traffic — visitors who land on your homepage — still shows as "Direct." This gives you a much clearer picture of where your traffic actually comes from, since most unattributed deep-page visits are people clicking links shared in messaging apps or AI chatbots that strip the referrer header.
+- **More in-app browsers detected.** Pulse now recognises visits from WhatsApp, Telegram, Snapchat, Pinterest, Reddit, and Threads in-app browsers and attributes them correctly instead of lumping them into "Direct."
 - **Dashboard blocks are now consistent in height.** The Goals & Events and Scroll Depth panels now match the height of every other block on the dashboard.
 - **Cleaner period picker.** The date range dropdown now has visual separators between the rolling windows (Today, Last 7 days, Last 30 days), the calendar periods (This week, This month), and Custom — so it's easy to tell them apart at a glance.
 - **New date range options.** The period selector now includes "This week" (Monday to today) and "This month" (1st to today) alongside the existing rolling windows. Your selection is remembered between sessions.

lib/utils/icons.tsx

@@ -18,6 +18,12 @@ import {
   YoutubeLogo,
   RedditLogo,
   Robot,
+  Link,
+  WhatsappLogo,
+  TelegramLogo,
+  SnapchatLogo,
+  PinterestLogo,
+  ThreadsLogo,
 } from '@phosphor-icons/react'
 
 /**
@@ -63,6 +69,11 @@ export function getReferrerIcon(referrerName: string) {
   if (lower.includes('github')) return <GithubLogo className="text-neutral-800 dark:text-neutral-200" />
   if (lower.includes('youtube')) return <YoutubeLogo className="text-red-600" />
   if (lower.includes('reddit')) return <RedditLogo className="text-orange-600" />
+  if (lower.includes('whatsapp')) return <WhatsappLogo className="text-green-500" />
+  if (lower.includes('telegram')) return <TelegramLogo className="text-blue-500" />
+  if (lower.includes('snapchat')) return <SnapchatLogo className="text-yellow-400" />
+  if (lower.includes('pinterest')) return <PinterestLogo className="text-red-600" />
+  if (lower.includes('threads')) return <ThreadsLogo className="text-neutral-800 dark:text-neutral-200" />
   // AI assistants and search tools
   if (lower.includes('chatgpt') || lower.includes('openai')) return <Robot className="text-neutral-800 dark:text-neutral-200" />
   if (lower.includes('perplexity')) return <Robot className="text-teal-600" />
@@ -73,11 +84,13 @@ export function getReferrerIcon(referrerName: string) {
   if (lower.includes('grok') || lower.includes('x.ai')) return <XLogo className="text-neutral-800 dark:text-neutral-200" />
   if (lower.includes('phind')) return <Robot className="text-purple-600" />
   if (lower.includes('you.com')) return <Robot className="text-indigo-600" />
+  // Shared Link (unattributed deep-page traffic)
+  if (lower === 'shared link') return <Link className="text-neutral-500" />
 
   return <Globe className="text-neutral-400" />
 }
 
-const REFERRER_NO_FAVICON = ['direct', 'unknown', '']
+const REFERRER_NO_FAVICON = ['direct', 'shared link', 'unknown', '']
 
 /** Common subdomains to skip when deriving the main label (e.g. l.instagram.com → instagram). */
 const REFERRER_SUBDOMAIN_SKIP = new Set([
@@ -100,6 +113,7 @@ const REFERRER_DISPLAY_OVERRIDES: Record<string, string> = {
   telegram: 'Telegram',
   pinterest: 'Pinterest',
   snapchat: 'Snapchat',
+  threads: 'Threads',
   tumblr: 'Tumblr',
   quora: 'Quora',
   't.co': 'X',