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/automations.css

@@ -174,103 +174,6 @@
     text-align: center;
 }
 
-/* Scene selector (searchable combobox) */
-.scene-selector {
-    position: relative;
-}
-
-.scene-selector-input-wrap {
-    display: flex;
-    align-items: center;
-    border: 1px solid var(--border-color);
-    border-radius: 4px;
-    background: var(--bg-color);
-    overflow: hidden;
-}
-
-.scene-selector-input {
-    flex: 1;
-    padding: 6px 8px;
-    border: none;
-    background: transparent;
-    color: var(--text-color);
-    font-size: 0.9rem;
-    font-family: inherit;
-    outline: none;
-}
-
-.scene-selector-clear {
-    background: none;
-    border: none;
-    color: var(--text-muted);
-    font-size: 1.1rem;
-    cursor: pointer;
-    padding: 4px 8px;
-    line-height: 1;
-    display: none;
-}
-
-.scene-selector-clear.visible {
-    display: block;
-}
-
-.scene-selector-clear:hover {
-    color: var(--danger-color, #dc3545);
-}
-
-.scene-selector-dropdown {
-    display: none;
-    position: absolute;
-    top: 100%;
-    left: 0;
-    right: 0;
-    z-index: 100;
-    max-height: 200px;
-    overflow-y: auto;
-    border: 1px solid var(--border-color);
-    border-top: none;
-    border-radius: 0 0 4px 4px;
-    background: var(--bg-color);
-    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
-}
-
-.scene-selector-dropdown.open {
-    display: block;
-}
-
-.scene-selector-item {
-    padding: 6px 10px;
-    font-size: 0.85rem;
-    cursor: pointer;
-    display: flex;
-    align-items: center;
-    gap: 6px;
-    transition: background 0.1s;
-}
-
-.scene-selector-item:hover {
-    background: rgba(33, 150, 243, 0.15);
-}
-
-.scene-selector-item.selected {
-    background: rgba(33, 150, 243, 0.2);
-    font-weight: 600;
-}
-
-.scene-selector-item .scene-color-dot {
-    width: 10px;
-    height: 10px;
-    border-radius: 50%;
-    flex-shrink: 0;
-}
-
-.scene-selector-empty {
-    padding: 8px 10px;
-    font-size: 0.85rem;
-    color: var(--text-muted);
-    text-align: center;
-}
-
 /* Webhook URL row */
 .webhook-url-row {
     display: flex;