Separate tree nodes into independent panels, remove graph local search, UI improvements

- Split Sources tab: raw/raw_templates, processed/proc_templates each get own panel
- Split Targets tab: led-devices, led-targets, kc-targets, kc-patterns each get own panel
- Remove graph local search — search button and / key open global command palette
- Add graphNavigateToNode for command palette → graph node navigation
- Add tree group expand/collapse animation (max-height + opacity transition)
- Make tree group headers visually distinct (smaller, uppercase, left border on children)
- Make CardSection collapse opt-in via collapsible flag (disabled by default)
- Move filter textbox next to section title (remove margin-left: auto)
- Fix notification bell button vertical centering in test preview
- Fix clipboard copy on non-HTTPS with execCommand fallback
- Add overlay toggle button on picture-based CSS cards
- Add CSPT to graph add-entity picker and global search
- Update all cross-link navigation paths for new panel keys
- Add i18n keys for new tree groups and search groups (en/ru/zh)

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

server/src/wled_controller/static/js/features/kc-targets.js

@@ -228,7 +228,7 @@ export function createKCTargetCard(target, sourceMap, patternTemplateMap, valueS
             </div>
             <div class="stream-card-props">
                 <span class="stream-card-prop${source ? ' stream-card-link' : ''}" title="${t('kc.source')}"${source ? ` onclick="event.stopPropagation(); navigateToCard('streams','${source.stream_type === 'static_image' ? 'static_image' : source.stream_type === 'processed' ? 'processed' : 'raw'}','${source.stream_type === 'static_image' ? 'static-streams' : source.stream_type === 'processed' ? 'proc-streams' : 'raw-streams'}','data-stream-id','${target.picture_source_id}')"` : ''}>${ICON_LINK_SOURCE} ${escapeHtml(sourceName)}</span>
-                <span class="stream-card-prop${patTmpl ? ' stream-card-link' : ''}" title="${t('kc.pattern_template')}"${patTmpl ? ` onclick="event.stopPropagation(); navigateToCard('targets','key_colors','kc-patterns','data-pattern-template-id','${kcSettings.pattern_template_id}')"` : ''}>${ICON_PATTERN_TEMPLATE} ${escapeHtml(patternName)}</span>
+                <span class="stream-card-prop${patTmpl ? ' stream-card-link' : ''}" title="${t('kc.pattern_template')}"${patTmpl ? ` onclick="event.stopPropagation(); navigateToCard('targets','kc-patterns','kc-patterns','data-pattern-template-id','${kcSettings.pattern_template_id}')"` : ''}>${ICON_PATTERN_TEMPLATE} ${escapeHtml(patternName)}</span>
                 <span class="stream-card-prop">▭ ${rectCount} rect${rectCount !== 1 ? 's' : ''}</span>
                 <span class="stream-card-prop" title="${t('kc.fps')}">${ICON_FPS} ${kcSettings.fps ?? 10}</span>
                 ${bvs ? `<span class="stream-card-prop stream-card-prop-full stream-card-link" title="${t('targets.brightness_vs')}" onclick="event.stopPropagation(); navigateToCard('streams','value','value-sources','data-id','${bvsId}')">${getValueSourceIcon(bvs.source_type)} ${escapeHtml(bvs.name)}</span>` : ''}