Close DV-01–04,07,09,13,14: unify operator-deck UX in server/web.

Standardize neon cyan on #00e8f5, wire SacredPageHeader across Builds/Path Tracer/LOTL, dedupe Pages.css, align Path Tracer chrome, drop dead wealth-deck CSS, add prefers-color-scheme shell + HelpTip, sidebar version from package.json build inject, and Vitest CSS regression guards.

server/internal/api/dashboard_ws_init.go

@@ -0,0 +1,35 @@
+package api
+
+import (
+	"net/http"
+	"strconv"
+
+	"crypto-miner-server/internal/db"
+)
+
+const (
+	dashboardInitDefaultLimit = 100
+	dashboardInitMaxLimit     = 2000
+)
+
+// parseDashboardInitFilter reads optional init_limit / init_offset on /ws/dashboard.
+func parseDashboardInitFilter(r *http.Request) (db.AgentListFilter, bool) {
+	limitStr := r.URL.Query().Get("init_limit")
+	if limitStr == "" {
+		return db.AgentListFilter{}, false
+	}
+	limit, err := strconv.Atoi(limitStr)
+	if err != nil || limit <= 0 {
+		limit = dashboardInitDefaultLimit
+	}
+	if limit > dashboardInitMaxLimit {
+		limit = dashboardInitMaxLimit
+	}
+	offset := 0
+	if offStr := r.URL.Query().Get("init_offset"); offStr != "" {
+		if o, err := strconv.Atoi(offStr); err == nil && o >= 0 {
+			offset = o
+		}
+	}
+	return db.AgentListFilter{Limit: limit, Offset: offset}, true
+}