Major graph editor improvements: standalone features, touch, docking, UX

Graph standalone features:
- Clone button on all entity nodes (copy icon, watches for new entity)
- Scene preset activation button (play icon, calls /activate API)
- Automation enable/disable via start/stop toggle (PUT enabled)
- Add missing entity types: sync_clock, scene_preset, pattern_template
- Fix edit/delete handlers for cspt, sync_clock
- CSPT added to test/preview button kinds
- Bulk delete with multi-select + Delete key confirmation
- Undo/redo framework with toolbar buttons (disabled when empty)
- Keyboard shortcuts help panel (? key, draggable, anchor-persisted)
- Enhanced search: type:device, tag:production filter syntax
- Tags passed through to all graph nodes for tag-based filtering
- Filter popover with grouped checkboxes replaces flat pill row

Touch device support:
- Pinch-to-zoom with 2-finger gesture tracking
- Double-tap zoom toggle (1.0x ↔ 1.8x)
- Multi-touch pointer tracking with pinch-to-pan
- Overlay buttons and port labels visible on selected (tapped) nodes
- Larger touch targets for ports (@media pointer: coarse)
- touch-action: none on SVG canvas
- 10px dead zone for touch vs 4px for mouse

Visual improvements:
- Port pin labels shown outside node on hover/select (outlined text)
- Hybrid active edge flow: thicker + glow + animated dots
- Test/preview icon changed to flask (matching card tabs)
- Clone icon scaled down to 60% for compact overlay buttons
- Monospace font for metric values (stable-width digits)
- Hide scrollbar on graph tab (html:has override)

Toolbar docking:
- 8-position dock system (4 corners + 4 side midpoints)
- Vertical layout when docked to left/right sides
- Dock position indicators shown during drag (dots with highlight)
- Snap animation on drop
- Persisted dock position in localStorage

Resize handling:
- View center preserved on fullscreen/window resize (ResizeObserver)
- All docked panels re-anchored on container resize
- Zoom inertia for wheel and toolbar +/- buttons

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

server/src/wled_controller/static/js/app.js

@@ -165,7 +165,7 @@ import {
 // Layer 5.5: graph editor
 import {
     loadGraphEditor,
-    toggleGraphLegend, toggleGraphMinimap, toggleGraphFilter, toggleGraphFilterTypes,
+    toggleGraphLegend, toggleGraphMinimap, toggleGraphFilter, toggleGraphFilterTypes, toggleGraphHelp, graphUndo, graphRedo,
     graphFitAll, graphZoomIn, graphZoomOut, graphRelayout,
     graphToggleFullscreen, graphAddEntity,
 } from './features/graph-editor.js';
@@ -487,6 +487,9 @@ Object.assign(window, {
     toggleGraphMinimap,
     toggleGraphFilter,
     toggleGraphFilterTypes,
+    toggleGraphHelp,
+    graphUndo,
+    graphRedo,
     graphFitAll,
     graphZoomIn,
     graphZoomOut,