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/value-sources.js

@@ -15,8 +15,11 @@ import { fetchWithAuth, escapeHtml } from '../core/api.js';
 import { t } from '../core/i18n.js';
 import { showToast, showConfirm } from '../core/ui.js';
 import { Modal } from '../core/modal.js';
+import { getValueSourceIcon, ICON_CLONE, ICON_EDIT } from '../core/icons.js';
 import { loadPictureSources } from './streams.js';
 
+export { getValueSourceIcon };
+
 class ValueSourceModal extends Modal {
     constructor() { super('value-source-modal'); }
 
@@ -271,13 +274,6 @@ export async function deleteValueSource(sourceId) {
 
 // ── Card rendering (used by streams.js) ───────────────────────
 
-const _vsTypeIcons = { static: '📊', animated: '🔄', audio: '🎵', adaptive_time: '🕐', adaptive_scene: '🌤️' };
-
-/** Return the emoji icon for a given value source type. */
-export function getValueSourceIcon(sourceType) {
-    return _vsTypeIcons[sourceType] || '🎚️';
-}
-
 export function createValueSourceCard(src) {
     const icon = getValueSourceIcon(src.source_type);
 
@@ -324,8 +320,8 @@ export function createValueSourceCard(src) {
             <div class="stream-card-props">${propsHtml}</div>
             ${src.description ? `<div class="template-config" style="opacity:0.7;">${escapeHtml(src.description)}</div>` : ''}
             <div class="template-card-actions">
-                <button class="btn btn-icon btn-secondary" onclick="cloneValueSource('${src.id}')" title="${t('common.clone')}">📋</button>
-                <button class="btn btn-icon btn-secondary" onclick="editValueSource('${src.id}')" title="${t('common.edit')}">✏️</button>
+                <button class="btn btn-icon btn-secondary" onclick="cloneValueSource('${src.id}')" title="${t('common.clone')}">${ICON_CLONE}</button>
+                <button class="btn btn-icon btn-secondary" onclick="editValueSource('${src.id}')" title="${t('common.edit')}">${ICON_EDIT}</button>
             </div>
         </div>
     `;