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.
Browse + install color themes from the VS Code Marketplace straight from
Cmd-K and Settings → Appearance. The Electron main process resolves the
extension, unzips the .vsix with a hand-rolled zip reader (zlib only, no
new deps), and hands back the raw theme JSON; the renderer converts it to
a DesktopTheme with a small seed → color-mix mapping.
- Folds an extension's light + dark variants into one theme family, so the
light/dark toggle switches Solarized/GitHub variants and installing in
dark mode stays dark.
- Guarantees accent contrast (WCAG AA) so imported sidebar labels read
instead of vanishing into the surface.
- Filters icon/product-icon packs out of the Themes-category search.
- "Install theme…" lives atop the Cmd-K theme picker; imports fold into
the Light/Dark groups by the modes they support.
