Overhaul view positioning to enable animated transitions

Views are now positioned inside the web contents so we can use CSS
transitions to animate them. Since the overlay renders in a different
process, I needed to move the border and listening glow into the web
contents so that they'd move in sync.

packages/streamwall-shared/src/types.ts

@@ -15,6 +15,7 @@ export interface StreamWindowConfig {
 
 export interface ContentDisplayOptions {
   rotation?: number
+  glowColor?: string
 }
 
 /** Metadata scraped from a loaded view */