Merge pr/panel-resize into pr/mapillary-layer

Bring in portable, resizable rail panels. The Street Level rail rules get
the same :not(.panel-floating) guard as CCTV's so the panel can float too.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

src/ui/panelChrome.js

@@ -63,6 +63,7 @@ export class PanelChrome {
       layoutRightPanels: () => this._layoutRightPanels(),
       syncCctvPanelViewport: () => this._syncCctvPanelViewport(),
       showToast: (message) => this._showToast(message),
+      onPanelResized: (panelId) => this._onPanelResized(panelId),
     });
     this._panelLayout = new PanelLayoutController({
       readHud: () => ({
@@ -146,6 +147,7 @@ export class PanelChrome {
     this._initCommandDockPins();
     this._initCommandDockTrayMetrics();
     this._maybeNotifyLayoutReset();
+    this._panelPosition._initPanelDrag();
   }
 
   _collapsePanelOnEscape(event, panelId) {