theme support, hot patch Grafana v12.4.0

• align styles with Grafana theme tokens. Theme support for widget buttons.
• hot patch for upstream FolderPickerTab Grafana 12.4.0. (No portal popups #119187)
• robust svg loading for edge arrows under stricter Grafana environments (v11.2.0)
• update field pickers and matchers from Grafana core

Grafana v12.4.0 patches

• fix the broken icon folder selection in Grafana 12.4.0.
• rm deprecated 'config.panels' usage
• more robust svg load for arrows under stricter Grafana environments (v11.2.0)

arrows for edges

-arrows config for edges in 'routed' view mode
-parallel edges support for arcs/hyperedges in nodegraph view
-cut edges at node boundary ports to prevent overlapping with semi-transparent nodes.
-show head node id in edge tooltip
-enlarge picked arc, edge

v.2.0.0 Node Graph

-Node Graph with autolayout and spline edge routing that respects node boundary curves. In addition to Geo mode.
-Arc sections on nodes for any metrics.
-Style config extends Grafana Geomap styles-from-dimensions concept with overrides for user-defined node groups
-Native Grafana Field config support: Thresholds, Mappings, Units, Overrides, Data links.
-Bi-metric Arcs (ex., for TX/RX)
-Ad-hoc filters by layers, node groups in the legend
-Unified (Graph+Geo) single dataframe for nodes and edges (same as in v.1) avoids hardcoded dataframe requirements of the native Geomap/NodeGraph.