Imported VS Code themes now carry their integrated-terminal ANSI palette
(`terminal.ansi*`), keyed to the painted variant (terminal / darkTerminal).
The terminal adopts it when the full base-8 set is present and keeps its VS
Code defaults otherwise; withSurface still owns the background, so the pane
stays translucent.
Pull the command palette and session switcher into a shared top-center HUD
(`floating-hud.ts`): no dim/blur backdrop, one compact text + item-padding
size, sidebar-label-style section headers (brand-tinted, uppercase), and the
themed portal scrollbar.
833410e02b