Centralize icon resolution into core/icons.js, fix auto-start row alignment

- Create core/icons.js with type-resolution getters and icon constants
- Replace inline emoji literals across 11 feature files with imports
- Remove duplicate icon maps (getEngineIcon, _vsTypeIcons, typeIcons, etc.)
- Fix dashboard auto-start row missing metrics placeholder div

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

server/src/wled_controller/static/js/features/kc-targets.js

@@ -14,7 +14,10 @@ import { API_BASE, getHeaders, fetchWithAuth, escapeHtml } from '../core/api.js'
 import { t } from '../core/i18n.js';
 import { lockBody, showToast, showConfirm, formatUptime } from '../core/ui.js';
 import { Modal } from '../core/modal.js';
-import { getValueSourceIcon } from './value-sources.js';
+import {
+    getValueSourceIcon, getPictureSourceIcon,
+    ICON_CLONE, ICON_EDIT, ICON_TEST, ICON_START, ICON_STOP,
+} from '../core/icons.js';
 
 class KCEditorModal extends Modal {
     constructor() {
@@ -152,21 +155,21 @@ export function createKCTargetCard(target, sourceMap, patternTemplateMap, valueS
             <div class="card-actions">
                 ${isProcessing ? `
                     <button class="btn btn-icon btn-danger" onclick="stopTargetProcessing('${target.id}')" title="${t('targets.button.stop')}">
-                        ⏹️
+                        ${ICON_STOP}
                     </button>
                 ` : `
                     <button class="btn btn-icon btn-primary" onclick="startTargetProcessing('${target.id}')" title="${t('targets.button.start')}">
-                        ▶️
+                        ${ICON_START}
                     </button>
                 `}
                 <button class="btn btn-icon btn-secondary" onclick="testKCTarget('${target.id}')" title="${t('kc.test')}">
-                    🧪
+                    ${ICON_TEST}
                 </button>
                 <button class="btn btn-icon btn-secondary" onclick="cloneKCTarget('${target.id}')" title="${t('common.clone')}">
-                    📋
+                    ${ICON_CLONE}
                 </button>
                 <button class="btn btn-icon btn-secondary" onclick="showKCEditor('${target.id}')" title="${t('common.edit')}">
-                    ✏️
+                    ${ICON_EDIT}
                 </button>
             </div>
         </div>
@@ -396,8 +399,7 @@ export async function showKCEditor(targetId = null, cloneData = null) {
             const opt = document.createElement('option');
             opt.value = s.id;
             opt.dataset.name = s.name;
-            const typeIcon = s.stream_type === 'raw' ? '\uD83D\uDDA5\uFE0F' : s.stream_type === 'static_image' ? '\uD83D\uDDBC\uFE0F' : '\uD83C\uDFA8';
-            opt.textContent = `${typeIcon} ${s.name}`;
+            opt.textContent = `${getPictureSourceIcon(s.stream_type)} ${s.name}`;
             sourceSelect.appendChild(opt);
         });