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/static/css/components.css

@@ -443,13 +443,6 @@ textarea:focus-visible {
 .endpoint-label { display: block; font-weight: 600; margin-bottom: 2px; opacity: 0.7; font-size: 0.8em; }
 
 /* Scene target selector */
-.scene-target-add-row {
-    display: flex;
-    gap: 6px;
-    margin-bottom: 8px;
-}
-.scene-target-add-row select { flex: 1; }
-.scene-target-add-row .btn { padding: 4px 10px; min-width: 0; flex: 0 0 auto; font-size: 0.85rem; }
 .scene-target-list {
     display: flex;
     flex-direction: column;
@@ -510,7 +503,8 @@ textarea:focus-visible {
 }
 
 .icon-select-popup {
-    position: relative;
+    position: fixed;
+    z-index: 10000;
     max-height: 0;
     overflow: hidden;
     opacity: 0;