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/devices.js

@@ -9,7 +9,7 @@ import { API_BASE, getHeaders, fetchWithAuth, escapeHtml, isSerialDevice, isMock
 import { t } from '../core/i18n.js';
 import { showToast, showConfirm } from '../core/ui.js';
 import { Modal } from '../core/modal.js';
-import { ICON_SETTINGS, ICON_STOP_PLAIN, ICON_LED, ICON_WEB } from '../core/icons.js';
+import { ICON_SETTINGS, ICON_STOP_PLAIN, ICON_LED, ICON_WEB, ICON_PLUG } from '../core/icons.js';
 
 class DeviceSettingsModal extends Modal {
     constructor() { super('device-settings-modal'); }
@@ -90,7 +90,7 @@ export function createDeviceCard(device) {
             <div class="card-subtitle">
                 <span class="card-meta device-type-badge">${(device.device_type || 'wled').toUpperCase()}</span>
                 ${ledCount ? `<span class="card-meta" title="${t('device.led_count')}">${ICON_LED} ${ledCount}</span>` : ''}
-                ${state.device_led_type ? `<span class="card-meta">🔌 ${state.device_led_type.replace(/ RGBW$/, '')}</span>` : ''}
+                ${state.device_led_type ? `<span class="card-meta">${ICON_PLUG} ${state.device_led_type.replace(/ RGBW$/, '')}</span>` : ''}
                 <span class="card-meta" title="${state.device_rgbw ? 'RGBW' : 'RGB'}"><span class="channel-indicator"><span class="ch" style="background:#e53935"></span><span class="ch" style="background:#43a047"></span><span class="ch" style="background:#1e88e5"></span>${state.device_rgbw ? '<span class="ch" style="background:#eee"></span>' : ''}</span></span>
             </div>
             ${(device.capabilities || []).includes('brightness_control') ? `