Replace all emoji icons with Lucide SVGs, add accent color picker

- Replace all emoji characters across WebUI with inline Lucide SVG icons
  for cross-platform consistency (icon paths in icon-paths.js)
- Add accent color picker popover with 9 preset colors + custom picker,
  persisted to localStorage, updates all CSS custom properties
- Remove subtab separator line for cleaner look
- Color badge icons with accent color for visual pop
- Remove processing badge from target cards
- Fix hardcoded #4CAF50 in FPS labels and active badges to use CSS vars
- Replace CSS content emoji (▶) with pure CSS triangle

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

server/src/wled_controller/static/js/features/audio-sources.js

@@ -15,6 +15,7 @@ import { API_BASE, fetchWithAuth, escapeHtml } from '../core/api.js';
 import { t } from '../core/i18n.js';
 import { showToast, showConfirm, lockBody, unlockBody } from '../core/ui.js';
 import { Modal } from '../core/modal.js';
+import { ICON_MUSIC } from '../core/icons.js';
 import { loadPictureSources } from './streams.js';
 
 class AudioSourceModal extends Modal {
@@ -43,7 +44,7 @@ export async function showAudioSourceModal(sourceType, editData) {
         ? (editData.source_type === 'mono' ? 'audio_source.edit.mono' : 'audio_source.edit.multichannel')
         : (sourceType === 'mono' ? 'audio_source.add.mono' : 'audio_source.add.multichannel');
 
-    document.getElementById('audio-source-modal-title').textContent = t(titleKey);
+    document.getElementById('audio-source-modal-title').innerHTML = `${ICON_MUSIC} ${t(titleKey)}`;
     document.getElementById('audio-source-id').value = isEdit ? editData.id : '';
     document.getElementById('audio-source-error').style.display = 'none';
 
@@ -199,7 +200,7 @@ async function _loadAudioDevices() {
         const data = await resp.json();
         const devices = data.devices || [];
         select.innerHTML = devices.map(d => {
-            const label = d.is_loopback ? `🔊 ${d.name}` : `🎤 ${d.name}`;
+            const label = d.name;
             const val = `${d.index}:${d.is_loopback ? '1' : '0'}`;
             return `<option value="${val}">${escapeHtml(label)}</option>`;
         }).join('');