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/profiles.js

@@ -9,6 +9,7 @@ import { showToast, showConfirm } from '../core/ui.js';
 import { Modal } from '../core/modal.js';
 import { CardSection } from '../core/card-sections.js';
 import { updateTabBadge } from './tabs.js';
+import { ICON_SETTINGS, ICON_STOP_PLAIN, ICON_START, ICON_PAUSE } from '../core/icons.js';
 
 class ProfileEditorModal extends Modal {
     constructor() { super('profile-editor-modal'); }
@@ -132,17 +133,17 @@ function createProfileCard(profile, runningTargetIds = new Set()) {
             </div>
             <div class="stream-card-props">${condPills}</div>
             <div class="card-actions">
-                <button class="btn btn-icon btn-secondary" onclick="openProfileEditor('${profile.id}')" title="${t('profiles.edit')}">⚙️</button>
+                <button class="btn btn-icon btn-secondary" onclick="openProfileEditor('${profile.id}')" title="${t('profiles.edit')}">${ICON_SETTINGS}</button>
                 ${profile.target_ids.length > 0 ? (() => {
                     const anyRunning = profile.target_ids.some(id => runningTargetIds.has(id));
                     return `<button class="btn btn-icon ${anyRunning ? 'btn-warning' : 'btn-success'}"
                         onclick="toggleProfileTargets('${profile.id}')"
                         title="${anyRunning ? t('profiles.toggle_all.stop') : t('profiles.toggle_all.start')}">
-                    ${anyRunning ? '⏹' : '▶️'}
+                    ${anyRunning ? ICON_STOP_PLAIN : ICON_START}
                 </button>`;
                 })() : ''}
                 <button class="btn btn-icon ${profile.enabled ? 'btn-warning' : 'btn-success'}" onclick="toggleProfileEnabled('${profile.id}', ${!profile.enabled})" title="${profile.enabled ? t('profiles.action.disable') : t('profiles.status.active')}">
-                    ${profile.enabled ? '⏸' : '▶'}
+                    ${profile.enabled ? ICON_PAUSE : '▶'}
                 </button>
             </div>
         </div>`;