Add clone support for scene and automation cards, update sync clock descriptions

- Scene clone: opens capture modal with prefilled name/description/targets
  instead of server-side duplication; removed backend clone endpoint
- Automation clone: opens editor with prefilled conditions, scene, logic,
  deactivation mode (webhook tokens stripped for uniqueness)
- Updated sync clock i18n descriptions to reflect speed-only-on-clock model
- Added entity card clone pattern documentation to server/CLAUDE.md

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

server/src/wled_controller/static/js/features/automations.js

@@ -185,6 +185,7 @@ function createAutomationCard(automation, sceneMap = new Map()) {
             </div>
             <div class="stream-card-props">${condPills}</div>`,
         actions: `
+                <button class="btn btn-icon btn-secondary" onclick="cloneAutomation('${automation.id}')" title="${t('common.clone')}">${ICON_CLONE}</button>
                 <button class="btn btn-icon btn-secondary" onclick="openAutomationEditor('${automation.id}')" title="${t('automations.edit')}">${ICON_SETTINGS}</button>
                 <button class="btn btn-icon ${automation.enabled ? 'btn-warning' : 'btn-success'}" onclick="toggleAutomationEnabled('${automation.id}', ${!automation.enabled})" title="${automation.enabled ? t('automations.action.disable') : t('automations.status.active')}">
                     ${automation.enabled ? ICON_PAUSE : ICON_START}
@@ -192,7 +193,7 @@ function createAutomationCard(automation, sceneMap = new Map()) {
     });
 }
 
-export async function openAutomationEditor(automationId) {
+export async function openAutomationEditor(automationId, cloneData) {
     const modal = document.getElementById('automation-editor-modal');
     const titleEl = document.getElementById('automation-editor-title');
     const idInput = document.getElementById('automation-editor-id');
@@ -241,6 +242,26 @@ export async function openAutomationEditor(automationId) {
             showToast(e.message, 'error');
             return;
         }
+    } else if (cloneData) {
+        // Clone mode — create with prefilled data
+        titleEl.innerHTML = `${ICON_AUTOMATION} ${t('automations.add')}`;
+        idInput.value = '';
+        nameInput.value = (cloneData.name || '') + ' (Copy)';
+        enabledInput.checked = cloneData.enabled !== false;
+        logicSelect.value = cloneData.condition_logic || 'or';
+
+        // Clone conditions (strip webhook tokens — they must be unique)
+        for (const c of (cloneData.conditions || [])) {
+            const clonedCond = { ...c };
+            if (clonedCond.condition_type === 'webhook') delete clonedCond.token;
+            addAutomationConditionRow(clonedCond);
+        }
+
+        _initSceneSelector('automation-scene', cloneData.scene_preset_id);
+
+        document.getElementById('automation-deactivation-mode').value = cloneData.deactivation_mode || 'none';
+        _onDeactivationModeChange();
+        _initSceneSelector('automation-fallback-scene', cloneData.deactivation_scene_preset_id);
     } else {
         titleEl.innerHTML = `${ICON_AUTOMATION} ${t('automations.add')}`;
         idInput.value = '';
@@ -729,6 +750,18 @@ export function copyWebhookUrl(btn) {
     });
 }
 
+export async function cloneAutomation(automationId) {
+    try {
+        const resp = await fetchWithAuth(`/automations/${automationId}`);
+        if (!resp.ok) throw new Error('Failed to load automation');
+        const automation = await resp.json();
+        openAutomationEditor(null, automation);
+    } catch (e) {
+        if (e.isAuth) return;
+        showToast(t('automations.error.clone_failed'), 'error');
+    }
+}
+
 export async function deleteAutomation(automationId, automationName) {
     const msg = t('automations.delete.confirm').replace('{name}', automationName);
     const confirmed = await showConfirm(msg);