Add fleet groups, agent screenshots, deploy guards, and Crucible polish.

server/web/src/components/Fleet/CreateGroupModal.css

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+.fleet-group-modal-backdrop {
+  position: fixed;
+  inset: 0;
+  z-index: 1200;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  padding: 1rem;
+  background: rgba(0, 0, 0, 0.72);
+  backdrop-filter: blur(4px);
+}
+
+.fleet-group-modal {
+  width: 100%;
+  max-width: 420px;
+  padding: 1.25rem 1.5rem;
+  border: 1px solid rgba(178, 75, 243, 0.45);
+  box-shadow: 0 0 40px rgba(178, 75, 243, 0.15);
+}
+
+.fleet-group-modal h2 {
+  margin: 0 0 0.35rem;
+  font-size: 1.25rem;
+}
+
+.fleet-group-color-grid {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 0.45rem;
+  margin-bottom: 0.75rem;
+}
+
+.fleet-group-swatch {
+  width: 2rem;
+  height: 2rem;
+  border-radius: 6px;
+  border: 2px solid transparent;
+  cursor: pointer;
+  padding: 0;
+  transition: transform 0.12s, box-shadow 0.12s;
+}
+
+.fleet-group-swatch:hover {
+  transform: scale(1.08);
+}
+
+.fleet-group-swatch.selected {
+  border-color: #fff;
+  box-shadow: 0 0 12px currentColor;
+  transform: scale(1.1);
+}
+
+.fleet-group-custom-color {
+  display: flex;
+  align-items: center;
+  gap: 0.75rem;
+  margin-bottom: 1rem;
+}
+
+.fleet-group-custom-color input[type='color'] {
+  width: 2.5rem;
+  height: 2.5rem;
+  border: none;
+  background: none;
+  cursor: pointer;
+}
+
+.fleet-group-modal-actions {
+  display: flex;
+  justify-content: flex-end;
+  gap: 0.5rem;
+  margin-top: 0.5rem;
+}