Add node peers, blue banners, glowing diff ranges, fix back navigation

- Show Bitcoin Core peer count on block height card (hover for in/out)
- BestSharePage disclaimers now use solid blue styling
- Difficulty distribution ranges glow from warm peach to deep red
- Back-to-dashboard buttons always navigate to dashboard instead of
  using browser history

api/internal/bitcoind/rpc.go

@@ -343,6 +343,20 @@ func (c *RPC) GetRawMempoolVerbose(ctx context.Context) (map[string]RawMempoolEn
 	return out, nil
 }
 
+type NetworkInfo struct {
+	Connections    int `json:"connections"`
+	ConnectionsIn  int `json:"connections_in"`
+	ConnectionsOut int `json:"connections_out"`
+}
+
+func (c *RPC) GetNetworkInfo(ctx context.Context) (*NetworkInfo, error) {
+	var out NetworkInfo
+	if err := c.Call(ctx, "getnetworkinfo", nil, &out); err != nil {
+		return nil, err
+	}
+	return &out, nil
+}
+
 // IsRPCError checks if err is an rpcError with a specific code.
 func IsRPCError(err error, code int) bool {
 	var rerr *rpcError

api/internal/state/aggregator.go

@@ -98,6 +98,11 @@ type Snapshot struct {
 	HasLastZMQEvent   bool    `json:"has_last_zmq_event"`
 	TipChangedAge     float64 `json:"tip_changed_age"`              // seconds since tip height last changed
 
+	// Bitcoin Core peer connections.
+	PeerCount    int `json:"peer_count"`
+	PeersIn      int `json:"peers_in"`
+	PeersOut     int `json:"peers_out"`
+
 	// Share counters: raw counts (1 submission = 1 share regardless of diff).
 	// Session = since ckpool started; AllTime = persisted across restarts.
 	SessionAccepted int64 `json:"session_accepted"`
@@ -460,6 +465,13 @@ func (a *Aggregator) refresh(ctx context.Context) {
 		}
 	}
 
+	// --- bitcoind: peer connections ---
+	if ni, err := a.RPC.GetNetworkInfo(ctx); err == nil {
+		next.PeerCount = ni.Connections
+		next.PeersIn = ni.ConnectionsIn
+		next.PeersOut = ni.ConnectionsOut
+	}
+
 	// --- predicted difficulty adjustment ---
 	// Fetch the timestamp of the first block in the current retarget
 	// epoch (height - height%2016) once per epoch and cache it, then

ui/src/lib/BestSharePage.svelte

@@ -399,15 +399,15 @@
   }
   .disclaimer {
     font-size: 0.82rem;
-    color: var(--fg-dim);
+    color: rgb(160, 195, 240);
-    background: rgba(245, 196, 71, 0.08);
+    background: rgb(20, 35, 60);
-    border: 1px solid rgba(245, 196, 71, 0.25);
+    border: 1px solid rgb(60, 100, 170);
     border-radius: 6px;
     padding: 0.5em 0.85em;
     line-height: 1.5;
   }
   .disclaimer strong {
-    color: var(--fg);
+    color: rgb(200, 220, 250);
   }
   .head {
     display: flex;

ui/src/lib/PoolOverview.svelte

@@ -208,7 +208,12 @@
   <div class="card height-card" class:new-block={heightFlash}>
     <div class="stat-label">Block height</div>
     <div class="stat-value">{height ? height.toLocaleString() : "—"}</div>
-    <div class="stat-sub">{data.chain?.chain === "main" ? "mainnet" : data.chain?.chain ?? "—"}</div>
+    <div class="stat-sub">
+      {data.chain?.chain === "main" ? "mainnet" : data.chain?.chain ?? "—"}
+      {#if data.peer_count > 0}
+        <span class="peers" title="{data.peers_in} inbound · {data.peers_out} outbound">&nbsp;· {data.peer_count} peers</span>
+      {/if}
+    </div>
   </div>
 
   <div class="card">

ui/src/lib/StatsPage.svelte

@@ -51,6 +51,8 @@
 
   // --- Difficulty distribution ---
   const bucketLabels = ["< 1M", "1M\u2013100M", "100M\u20131G", "1G\u2013100G", "100G\u20131T", "\u2265 1T"];
+  // Fire intensity classes: none for <1M, then progressively more intense.
+  const fireClasses = ["", "fire-1", "fire-2", "fire-3", "fire-4", "fire-5"];
 
   type BucketRow = {
     label: string;
@@ -180,7 +182,7 @@
 
   <!-- Difficulty Distribution Table -->
   <section class="card">
-    <h3>Difficulty Distribution</h3>
+    <h3>Difficulty Distribution - Amount of shares in different difficulty ranges</h3>
     {#if !hasDistData}
       <div class="empty">No accepted shares yet</div>
     {:else}
@@ -196,9 +198,16 @@
             </tr>
           </thead>
           <tbody>
-            {#each bucketRows as row}
+            {#each bucketRows as row, i}
-              <tr class:dim-row={row.session === 0 && row.alltime === 0}>
+              {@const hasShares = row.session > 0 || row.alltime > 0}
-                <td>{row.label}</td>
+              <tr class:dim-row={!hasShares && !fireClasses[i]}>
+                <td>
+                  {#if fireClasses[i]}
+                    <span class="fire-label {fireClasses[i]}" class:fire-active={hasShares} class:fire-dimmed={!hasShares}>{row.label}</span>
+                  {:else}
+                    {row.label}
+                  {/if}
+                </td>
                 <td class="num">{row.session.toLocaleString()}</td>
                 <td class="num">{row.sessionPct.toFixed(1)}%</td>
                 <td class="num">{row.alltime.toLocaleString()}</td>
@@ -310,4 +319,24 @@
   tr[title]:hover td { color: var(--accent); }
   .dim-row td { opacity: 0.35; }
 
+  /* --- Glowing range labels --- */
+  .fire-label {
+    display: inline-block;
+    font-weight: 600;
+  }
+  .fire-dimmed { opacity: 0.2; }
+  .fire-active { animation: glow-pulse 2s ease-in-out infinite alternate; }
+
+  .fire-1.fire-active { color: #ffcc80; --glow: 255, 180, 100; }
+  .fire-2.fire-active { color: #ff9a5c; --glow: 255, 140, 60; }
+  .fire-3.fire-active { color: #ff6e40; --glow: 255, 90, 30; }
+  .fire-4.fire-active { color: #f44336; --glow: 230, 40, 20; }
+  .fire-5.fire-active { color: #c62828; --glow: 180, 20, 10; }
+
+  @keyframes glow-pulse {
+    0%   { text-shadow: 0 0 8px rgba(var(--glow), 0.4); }
+    100% { text-shadow: 0 0 8px rgba(var(--glow), 0.85),
+                        0 0 16px rgba(var(--glow), 0.3); }
+  }
+
 </style>

ui/src/stores/selection.svelte.ts

@@ -74,16 +74,5 @@ export function selectBestShare(): void {
 }
 
 export function clearSelection(): void {
-  if (
-    window.history.length > 1 &&
-    (window.location.hash.startsWith(USER_PREFIX) ||
-      window.location.hash.startsWith(WORKER_PREFIX) ||
-      window.location.hash === ACCELERATOR_HASH ||
-      window.location.hash === STATS_HASH ||
-      window.location.hash === BESTSHARE_HASH)
-  ) {
-    window.history.back();
-  } else {
   window.location.hash = "";
-  }
 }

ui/src/types.ts

@@ -147,6 +147,9 @@ export type Snapshot = {
   has_last_zmq_event: boolean;
   last_zmq_event_age?: number; // seconds
   tip_changed_age: number;     // seconds since tip height last changed
+  peer_count: number;
+  peers_in: number;
+  peers_out: number;
   // Share counters (raw, 1 submission = 1 share).
   session_accepted: number;
   session_rejected: number;