Refactor process picker into palette pattern, add notification app picker

- Refactor process-picker.ts into generic NamePalette with two concrete
  instances: ProcessPalette (running processes) and NotificationAppPalette
  (OS notification history apps)
- Notification color strip app colors and filter list now use
  NotificationAppPalette (shows display names like "Telegram" instead of
  process names like "telegram.exe")
- Fix case-insensitive matching for app_colors and app_filter_list in
  notification_stream.py
- Compact browse/remove buttons in notification app color rows with
  proper search icon
- Remove old inline process-picker HTML/CSS (replaced by palette overlay)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

server/src/wled_controller/templates/modals/css-editor.html

@@ -460,10 +460,6 @@
                                 <button type="button" class="btn-browse-apps" data-i18n="automations.condition.application.browse">Browse</button>
                             </div>
                             <textarea id="css-editor-notification-filter-list" class="condition-apps" rows="3" data-i18n-placeholder="color_strip.notification.filter_list.placeholder" placeholder="Discord&#10;Slack&#10;Telegram"></textarea>
-                            <div class="process-picker" style="display:none">
-                                <input type="text" class="process-picker-search" data-i18n-placeholder="automations.condition.application.search" placeholder="Search..." autocomplete="off">
-                                <div class="process-picker-list"></div>
-                            </div>
                         </div>
                     </div>