Add profile conditions, scene presets, MQTT integration, and Scenes tab

Feature 1 — Profile Conditions: time-of-day, system idle (Win32
GetLastInputInfo), and display state (GUID_CONSOLE_DISPLAY_STATE)
condition types for automatic profile activation.

Feature 2 — Scene Presets: snapshot/restore system that captures target
running states, device brightness, and profile enables. Server-side
capture with 5-step activation order. Dedicated Scenes tab with
CardSection-based card grid, command palette integration, and dashboard
quick-activate section.

Feature 3 — MQTT Integration: MQTTService singleton with aiomqtt,
MQTTLEDClient device provider for pixel output, MQTT profile condition
type with topic/payload matching, and frontend support for MQTT device
type and condition editor.

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

server/src/wled_controller/static/js/app.js

@@ -82,6 +82,11 @@ import {
     toggleProfileEnabled, toggleProfileTargets, deleteProfile,
     expandAllProfileSections, collapseAllProfileSections,
 } from './features/profiles.js';
+import {
+    loadScenes, expandAllSceneSections, collapseAllSceneSections,
+    openScenePresetCapture, editScenePreset, saveScenePreset, closeScenePresetEditor,
+    activateScenePreset, recaptureScenePreset, deleteScenePreset,
+} from './features/scene-presets.js';
 
 // Layer 5: device-discovery, targets
 import {
@@ -307,6 +312,18 @@ Object.assign(window, {
     expandAllProfileSections,
     collapseAllProfileSections,
 
+    // scene presets
+    loadScenes,
+    expandAllSceneSections,
+    collapseAllSceneSections,
+    openScenePresetCapture,
+    editScenePreset,
+    saveScenePreset,
+    closeScenePresetEditor,
+    activateScenePreset,
+    recaptureScenePreset,
+    deleteScenePreset,
+
     // device-discovery
     onDeviceTypeChanged,
     updateBaudFpsHint,
@@ -422,9 +439,9 @@ document.addEventListener('keydown', (e) => {
         return;
     }
 
-    // Tab shortcuts: Ctrl+1..4 (skip when typing in inputs)
+    // Tab shortcuts: Ctrl+1..5 (skip when typing in inputs)
     if (!inInput && e.ctrlKey && !e.altKey && !e.shiftKey && !e.metaKey) {
-        const tabMap = { '1': 'dashboard', '2': 'profiles', '3': 'targets', '4': 'streams' };
+        const tabMap = { '1': 'dashboard', '2': 'profiles', '3': 'targets', '4': 'streams', '5': 'scenes' };
         const tab = tabMap[e.key];
         if (tab) {
             e.preventDefault();