Premium UX polish: command decks, runtime helpers, branding assets

- Add command deck layouts to all specialty workspaces (agriculture,
  daily living, interop, training/knowledge, benchmark) with accessible
  panel switching via aria roles and keyboard support
- Extract shared runtime helpers: blob download with safe revoke,
  popup print flows (openPendingPopup/replacePopupHtml), iframe HTML
  writer with render tokens, hidden-frame print for wallet cards
- Refine theme consistency CSS: sidebar brand, context bar, settings
  command pills, calmer empty states across workspaces
- Harden map atlas print against XSS in titles and waypoint labels
- Add shell suggested-actions panel and quick-return context bar
- Add project branding assets (icons, banner, favicon)
- Add ROADMAP-COMPLETED.md documenting finished v8 phases

Author: FOSSFOREVER