feat: add hash size distribution by number of repeaters

Add a new 'By Repeaters' view to the hash size distribution card that
shows how many unique repeaters advertise each hash size, complementing
the existing per-packet distribution.

Backend: compute distributionByRepeaters from byNode data in
/api/analytics/hash-sizes endpoint.

Frontend: render a second bar chart under the existing distribution
showing repeater counts with percentages.

Tests: verify distributionByRepeaters is present and correctly typed.

public/analytics.js

@@ -876,6 +876,26 @@
             </div>`;
             }).join('')}
           </div>
+          ${data.distributionByRepeaters ? (() => {
+            const dr = data.distributionByRepeaters;
+            const totalRepeaters = (dr[1] || 0) + (dr[2] || 0) + (dr[3] || 0);
+            const rpct = (n) => totalRepeaters ? (n / totalRepeaters * 100).toFixed(1) : '0';
+            const maxRepeaters = Math.max(dr[1] || 0, dr[2] || 0, dr[3] || 0, 1);
+            const colors = { 1: '#ef4444', 2: '#22c55e', 3: '#3b82f6' };
+            return `<h4 style="margin:16px 0 4px">By Repeaters</h4>
+              <p class="text-muted">${totalRepeaters.toLocaleString()} unique repeaters</p>
+              <div class="hash-bars">
+                ${[1, 2, 3].map(size => {
+                  const count = dr[size] || 0;
+                  const width = Math.max((count / maxRepeaters) * 100, count ? 2 : 0);
+                  return `<div class="hash-bar-row">
+                  <div class="hash-bar-label"><strong>${size}-byte</strong></div>
+                  <div class="hash-bar-track"><div class="hash-bar-fill" style="width:${width}%;background:${colors[size]};opacity:0.7"></div></div>
+                  <div class="hash-bar-value">${count.toLocaleString()} <span class="text-muted">(${rpct(count)}%)</span></div>
+                </div>`;
+                }).join('')}
+              </div>`;
+          })() : ''}
         </div>
         <div class="analytics-card flex-1">
           <h3>📈 Hash Size Over Time</h3>

public/index.html

@@ -22,9 +22,9 @@
   <meta name="twitter:title" content="CoreScope">
   <meta name="twitter:description" content="Real-time MeshCore LoRa mesh network analyzer — live packet visualization, node tracking, channel decryption, and route analysis.">
   <meta name="twitter:image" content="https://raw.githubusercontent.com/Kpa-clawbot/corescope/master/public/og-image.png">
-  <link rel="stylesheet" href="style.css?v=1774786038">
-  <link rel="stylesheet" href="home.css?v=1774786038">
-  <link rel="stylesheet" href="live.css?v=1774786038">
+  <link rel="stylesheet" href="style.css?v=1774821783">
+  <link rel="stylesheet" href="home.css?v=1774821783">
+  <link rel="stylesheet" href="live.css?v=1774821783">
   <link rel="stylesheet" href="https://unpkg.com/leaflet@1.9.4/dist/leaflet.css"
     integrity="sha256-p4NxAoJBhIIN+hmNHrzRCf9tD/miZyoHS5obTRR9BMY="
     crossorigin="anonymous">
@@ -81,29 +81,29 @@
   <main id="app" role="main"></main>
 
   <script src="vendor/qrcode.js"></script>
-  <script src="roles.js?v=1774786038"></script>
-  <script src="customize.js?v=1774786038" onerror="console.error('Failed to load:', this.src)"></script>
-  <script src="region-filter.js?v=1774786038"></script>
-  <script src="hop-resolver.js?v=1774786038"></script>
-  <script src="hop-display.js?v=1774786038"></script>
-  <script src="app.js?v=1774786038"></script>
-  <script src="home.js?v=1774786038"></script>
-  <script src="packet-filter.js?v=1774786038"></script>
-  <script src="packets.js?v=1774786038"></script>
-  <script src="map.js?v=1774786038" onerror="console.error('Failed to load:', this.src)"></script>
-  <script src="channels.js?v=1774786038" onerror="console.error('Failed to load:', this.src)"></script>
-  <script src="nodes.js?v=1774786038" onerror="console.error('Failed to load:', this.src)"></script>
-  <script src="traces.js?v=1774786038" onerror="console.error('Failed to load:', this.src)"></script>
-  <script src="analytics.js?v=1774786038" onerror="console.error('Failed to load:', this.src)"></script>
-  <script src="audio.js?v=1774786038" onerror="console.error('Failed to load:', this.src)"></script>
-  <script src="audio-v1-constellation.js?v=1774786038" onerror="console.error('Failed to load:', this.src)"></script>
-  <script src="audio-v2-constellation.js?v=1774786038" onerror="console.error('Failed to load:', this.src)"></script>
-  <script src="audio-lab.js?v=1774786038" onerror="console.error('Failed to load:', this.src)"></script>
-  <script src="live.js?v=1774786038" onerror="console.error('Failed to load:', this.src)"></script>
-  <script src="observers.js?v=1774786038" onerror="console.error('Failed to load:', this.src)"></script>
-  <script src="observer-detail.js?v=1774786038" onerror="console.error('Failed to load:', this.src)"></script>
-  <script src="compare.js?v=1774786038" onerror="console.error('Failed to load:', this.src)"></script>
-  <script src="node-analytics.js?v=1774786038" onerror="console.error('Failed to load:', this.src)"></script>
-  <script src="perf.js?v=1774786038" onerror="console.error('Failed to load:', this.src)"></script>
+  <script src="roles.js?v=1774821783"></script>
+  <script src="customize.js?v=1774821783" onerror="console.error('Failed to load:', this.src)"></script>
+  <script src="region-filter.js?v=1774821783"></script>
+  <script src="hop-resolver.js?v=1774821783"></script>
+  <script src="hop-display.js?v=1774821783"></script>
+  <script src="app.js?v=1774821783"></script>
+  <script src="home.js?v=1774821783"></script>
+  <script src="packet-filter.js?v=1774821783"></script>
+  <script src="packets.js?v=1774821783"></script>
+  <script src="map.js?v=1774821783" onerror="console.error('Failed to load:', this.src)"></script>
+  <script src="channels.js?v=1774821783" onerror="console.error('Failed to load:', this.src)"></script>
+  <script src="nodes.js?v=1774821783" onerror="console.error('Failed to load:', this.src)"></script>
+  <script src="traces.js?v=1774821783" onerror="console.error('Failed to load:', this.src)"></script>
+  <script src="analytics.js?v=1774821783" onerror="console.error('Failed to load:', this.src)"></script>
+  <script src="audio.js?v=1774821783" onerror="console.error('Failed to load:', this.src)"></script>
+  <script src="audio-v1-constellation.js?v=1774821783" onerror="console.error('Failed to load:', this.src)"></script>
+  <script src="audio-v2-constellation.js?v=1774821783" onerror="console.error('Failed to load:', this.src)"></script>
+  <script src="audio-lab.js?v=1774821783" onerror="console.error('Failed to load:', this.src)"></script>
+  <script src="live.js?v=1774821783" onerror="console.error('Failed to load:', this.src)"></script>
+  <script src="observers.js?v=1774821783" onerror="console.error('Failed to load:', this.src)"></script>
+  <script src="observer-detail.js?v=1774821783" onerror="console.error('Failed to load:', this.src)"></script>
+  <script src="compare.js?v=1774821783" onerror="console.error('Failed to load:', this.src)"></script>
+  <script src="node-analytics.js?v=1774821783" onerror="console.error('Failed to load:', this.src)"></script>
+  <script src="perf.js?v=1774821783" onerror="console.error('Failed to load:', this.src)"></script>
 </body>
 </html>

server.js

@@ -1987,9 +1987,17 @@ app.get('/api/analytics/hash-sizes', (req, res) => {
     .sort(([, a], [, b]) => b.packets - a.packets)
     .map(([name, data]) => ({ name, ...data }));
 
+  // Distribution by number of repeaters advertising each hash size
+  const distributionByRepeaters = { 1: 0, 2: 0, 3: 0 };
+  for (const [, v] of Object.entries(byNode)) {
+    const s = v.hashSize;
+    if (s >= 1 && s <= 3) distributionByRepeaters[s]++;
+  }
+
   const _hsResult = {
     total: packets.length,
     distribution,
+    distributionByRepeaters,
     hourly,
     topHops,
     multiByteNodes

test-server-routes.js

@@ -583,6 +583,11 @@ seedTestData();
   await t('GET /api/analytics/hash-sizes', async () => {
     const r = await request(app).get('/api/analytics/hash-sizes').expect(200);
     assert(typeof r.body === 'object', 'should return hash sizes');
+    assert(r.body.distributionByRepeaters, 'should include distributionByRepeaters');
+    assert(typeof r.body.distributionByRepeaters === 'object', 'distributionByRepeaters should be an object');
+    for (const s of [1, 2, 3]) {
+      assert(typeof r.body.distributionByRepeaters[s] === 'number', `distributionByRepeaters[${s}] should be a number`);
+    }
   });
 
   await t('GET /api/analytics/hash-sizes with region', async () => {