Major rebranding, i18n, dashboard, shared folders, role capabilities

- Rebrand: new app/agent icons, SKALD.md, warm "paper" CSS palette
  (terracotta accent, --radius tokens, WCAG contrast, reduced-motion),
  updated favicon, tray icon, skaldkonur asset
- i18n: backend crate (i18n.rs, locale column, ui_locale config),
  frontend library (web/lib/i18n.js, I18nMixin, t(key)),
  translation files (web/i18n/), every component wired
- Dashboard: <dashboard-page> replaces old home-page content;
  <app-copilot> becomes the landing page (full/dock layout modes)
- Shared folders: API endpoints (shared_folders.rs), frontend page,
  can_write membership, container mount topology, user_fs routing
- Role capabilities: new db table & authorization seam (data not enums),
  roles.attrs JSON for ui_mode / interface select
- Setup: skald-setup prompts for language + password, sets ui_locale
- General: components migrated to CSS variables, Lit conventions cleanup,
  connectors/catalog/marketplace/approval refactoring

README.md

@@ -2,9 +2,9 @@
 
 > ⚠️ **Active development** — expect breaking changes. Things move fast.
 
-<table><tr><td width="220"><img src="assets/images/skaldkonur.png" alt="Skáldkonur — the digital skald" width="200"></td><td>
+<table><tr><td width="220"><img src="assets/images/skaldkonur.png" alt="Skald Circle — app icon" width="200"></td><td>
 
-**Skald** (also **Skáldkonur**) is a local AI assistant that lives on your machine — named after the Norse tradition of women skalds, the poet-warriors who wove history, memory, and wisdom into verse. It chats with you, helps you get things done, and — because it can rewrite and restart itself — grows with you.
+**Skald Circle** is a family AI assistant — a warm, collaborative space where families and small groups work together. With a supervised chat system for children and vulnerable people.
 
 It's not a chatbot you talk to. It's a partner that nudges you, remembers what matters, and runs tasks on your behalf: reading your email, checking your calendar, sending WhatsApp messages, writing code, researching the web, generating images, and more.