Standardize emojis across header, favicons, and ecosystem links

Canonical emoji set for consistency:
- 🕸️ rNetwork (was 🌐), ⚖️ rChoices (was 🔀), 📋 rWork (was 💼)
- 🔐 rIdentity (was 🔑), 📖 rPubs (was 📰), 💸 rFunds (was 💰)
- 💰 rWallet (was 💼 in footer), 📬 rInbox (was ✉️)
- 💭 rForum (was 💬, differentiates from rChats)
- 📢 rSocials (was 📱), 🔨 rAuctions (was 🏛️ in footer)
- 🎬 rTube (was 📹 in footer)

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

portal/templates/portal/landing.html

@@ -590,13 +590,13 @@
         <a href="https://rmaps.online">🗺️ rMaps</a>
         <a href="https://rnotes.online">📝 rNotes</a>
         <a href="https://rvote.online">🗳️ rVote</a>
-        <a href="https://rfunds.online">💰 rFunds</a>
+        <a href="https://rfunds.online">💸 rFunds</a>
         <a href="https://rtrips.online">✈️ rTrips</a>
         <a href="https://rcart.online">🛒 rCart</a>
-        <a href="https://rwallet.online">💼 rWallet</a>
+        <a href="https://rwallet.online">💰 rWallet</a>
         <a href="https://rfiles.online" class="current">📁 rFiles</a>
-        <a href="https://rinbox.online">✉️ rInbox</a>
-        <a href="https://rnetwork.online">🌐 rNetwork</a>
+        <a href="https://rinbox.online">📬 rInbox</a>
+        <a href="https://rnetwork.online">🕸️ rNetwork</a>
     </div>
     <p class="ecosystem-tagline">Part of the r* ecosystem &mdash; collaborative tools for communities.</p>
 </div>