Frontend polish: loading states, CSS variables, focus indicators, scroll lock

- Add tab refresh loading bar animation for all 4 tab loaders
- Add profiles loading guard to prevent concurrent fetches
- Centralize theme colors into CSS variables (--text-secondary, --text-muted,
  --bg-secondary, --success-color, --shadow-color) for both dark/light themes
- Replace hardcoded gray values across 10 CSS files with variables
- Fix duplicate .btn-sm definition in modal.css
- Fix z-index: toast 2001→2500 to safely clear modals at 2000
- Add :focus-visible keyboard navigation indicators for all interactive elements
- Add responsive breakpoints for tab bar and header on narrow screens
- Prevent background page scroll when command palette is open

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

server/src/wled_controller/static/js/features/dashboard.js

@@ -5,7 +5,7 @@
 import { apiKey, _dashboardLoading, set_dashboardLoading, dashboardPollInterval, setDashboardPollInterval } from '../core/state.js';
 import { API_BASE, getHeaders, fetchWithAuth, escapeHtml } from '../core/api.js';
 import { t } from '../core/i18n.js';
-import { showToast, formatUptime } from '../core/ui.js';
+import { showToast, formatUptime, setTabRefreshing } from '../core/ui.js';
 import { renderPerfSection, initPerfCharts, startPerfPolling, stopPerfPolling } from './perf-charts.js';
 import { startAutoRefresh, updateTabBadge } from './tabs.js';
 import {
@@ -302,6 +302,7 @@ export async function loadDashboard(forceFullRender = false) {
     set_dashboardLoading(true);
     const container = document.getElementById('dashboard-content');
     if (!container) { set_dashboardLoading(false); return; }
+    setTabRefreshing('dashboard-content', true);
 
     try {
         const [targetsResp, profilesResp, devicesResp, cssResp] = await Promise.all([
@@ -481,6 +482,7 @@ export async function loadDashboard(forceFullRender = false) {
         container.innerHTML = `<div class="dashboard-no-targets">${t('dashboard.failed')}</div>`;
     } finally {
         set_dashboardLoading(false);
+        setTabRefreshing('dashboard-content', false);
     }
 }
 

server/src/wled_controller/static/js/features/profiles.js

@@ -2,10 +2,10 @@
  * Profiles — profile cards, editor, condition builder, process picker.
  */
 
-import { apiKey, _profilesCache, set_profilesCache } from '../core/state.js';
+import { apiKey, _profilesCache, set_profilesCache, _profilesLoading, set_profilesLoading } from '../core/state.js';
 import { fetchWithAuth, escapeHtml } from '../core/api.js';
 import { t } from '../core/i18n.js';
-import { showToast, showConfirm } from '../core/ui.js';
+import { showToast, showConfirm, setTabRefreshing } from '../core/ui.js';
 import { Modal } from '../core/modal.js';
 import { CardSection } from '../core/card-sections.js';
 import { updateTabBadge } from './tabs.js';
@@ -41,8 +41,11 @@ document.addEventListener('server:profile_state_changed', () => {
 });
 
 export async function loadProfiles() {
+    if (_profilesLoading) return;
+    set_profilesLoading(true);
     const container = document.getElementById('profiles-content');
-    if (!container) return;
+    if (!container) { set_profilesLoading(false); return; }
+    setTabRefreshing('profiles-content', true);
 
     try {
         const [profilesResp, targetsResp] = await Promise.all([
@@ -67,6 +70,9 @@ export async function loadProfiles() {
         if (error.isAuth) return;
         console.error('Failed to load profiles:', error);
         container.innerHTML = `<p class="error-message">${error.message}</p>`;
+    } finally {
+        set_profilesLoading(false);
+        setTabRefreshing('profiles-content', false);
     }
 }
 

server/src/wled_controller/static/js/features/streams.js

@@ -26,7 +26,7 @@ import {
 import { API_BASE, getHeaders, fetchWithAuth, escapeHtml } from '../core/api.js';
 import { t } from '../core/i18n.js';
 import { Modal } from '../core/modal.js';
-import { showToast, showConfirm, openLightbox, openFullImageLightbox, showOverlaySpinner, hideOverlaySpinner } from '../core/ui.js';
+import { showToast, showConfirm, openLightbox, openFullImageLightbox, showOverlaySpinner, hideOverlaySpinner, setTabRefreshing } from '../core/ui.js';
 import { openDisplayPicker, formatDisplayLabel } from './displays.js';
 import { CardSection } from '../core/card-sections.js';
 import { updateSubTabHash } from './tabs.js';
@@ -516,6 +516,7 @@ export async function deleteTemplate(templateId) {
 export async function loadPictureSources() {
     if (_sourcesLoading) return;
     set_sourcesLoading(true);
+    setTabRefreshing('streams-list', true);
     try {
         const [filtersResp, ppResp, captResp, streamsResp, audioResp, valueResp] = await Promise.all([
             _availableFilters.length === 0 ? fetchWithAuth('/filters') : Promise.resolve(null),
@@ -558,6 +559,7 @@ export async function loadPictureSources() {
         `;
     } finally {
         set_sourcesLoading(false);
+        setTabRefreshing('streams-list', false);
     }
 }
 

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

@@ -12,7 +12,7 @@ import {
 } from '../core/state.js';
 import { API_BASE, getHeaders, fetchWithAuth, escapeHtml } from '../core/api.js';
 import { t } from '../core/i18n.js';
-import { showToast, showConfirm, formatUptime } from '../core/ui.js';
+import { showToast, showConfirm, formatUptime, setTabRefreshing } from '../core/ui.js';
 import { Modal } from '../core/modal.js';
 import { createDeviceCard, attachDeviceListeners, fetchDeviceBrightness, _computeMaxFps } from './devices.js';
 import { createKCTargetCard, connectKCWebSocket, disconnectKCWebSocket } from './kc-targets.js';
@@ -407,6 +407,7 @@ export async function loadTargetsTab() {
     // Skip if another loadTargetsTab or a button action is already running
     if (_loadTargetsLock || _actionInFlight) return;
     _loadTargetsLock = true;
+    setTabRefreshing('targets-panel-content', true);
 
     try {
         // Fetch devices, targets, CSS sources, picture sources, pattern templates, and value sources in parallel
@@ -654,6 +655,7 @@ export async function loadTargetsTab() {
         container.innerHTML = `<div class="loading">${t('targets.failed')}</div>`;
     } finally {
         _loadTargetsLock = false;
+        setTabRefreshing('targets-panel-content', false);
     }
 }