Add EntitySelect/IconSelect UI improvements across modals

- Portal IconSelect popups to document.body with position:fixed to prevent
  clipping by modal overflow-y:auto
- Replace custom scene selectors in automation editor with EntitySelect
  command-palette pickers (main scene + fallback scene)
- Add IconSelect grid for automation deactivation mode (none/revert/fallback)
- Add IconSelect grid for automation condition type and match type
- Replace mapped zone source dropdowns with EntitySelect pickers
- Replace scene target selector with EntityPalette.pick() pattern
- Remove effect palette preview bar from CSS editor
- Remove sensitivity badge from audio color strip source cards
- Clean up unused scene-selector CSS and scene-target-add-row CSS
- Add locale keys for all new UI elements across en/ru/zh

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

server/src/wled_controller/templates/index.html

@@ -18,6 +18,7 @@
     <link rel="stylesheet" href="/static/css/cards.css">
     <link rel="stylesheet" href="/static/css/modal.css">
     <link rel="stylesheet" href="/static/css/calibration.css">
+    <link rel="stylesheet" href="/static/css/advanced-calibration.css">
     <link rel="stylesheet" href="/static/css/dashboard.css">
     <link rel="stylesheet" href="/static/css/streams.css">
     <link rel="stylesheet" href="/static/css/patterns.css">
@@ -147,6 +148,7 @@
     <div id="toast" class="toast"></div>
 
     {% include 'modals/calibration.html' %}
+    {% include 'modals/advanced-calibration.html' %}
     {% include 'modals/device-settings.html' %}
     {% include 'modals/target-editor.html' %}
     {% include 'modals/css-editor.html' %}