Redesign the shell and console with a liquid-glass look.

- Title bar: floating glass capsule aligned to each page's content edge, new
  NETX mark (links-as-X), task badge, user menu with sign-out, globe locale.
- Console: resource strip on top, module launcher as the main area with
  fixed-size tiles that fill rows as modules are added, task rail sized to
  the left column; dropped health pill, refresh button and filler copy.
- Glass layer (theme/glass.css, loaded last): black-blue wallpaper with a
  faint dot grid, clear panels with specular rims, translucent controls and
  table headers; sidebar pages float their nav and work area on a 16px gutter.
- Removed ~280 lines of duplicated header CSS from primitives/theme.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

web/src/index.css

@@ -28,3 +28,4 @@
 
 /* Design language layer — must stay last. */
 @import "./styles/theme/theme.css";
+@import "./styles/theme/glass.css";