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

SKALD.md

@@ -0,0 +1,31 @@
+# Skald Circle — SKALD
+
+## Stato attuale
+
+Progetto nuova applicazione con agenti e chatbot per aiutare famiglie e piccoli gruppi a collaborare, con chat supervisionato per bambini/persone vulnerabili.
+
+### Icone agenti — completate ✅
+
+Tutti gli 11 agenti hanno ora icone in stile **Vector Paintings** (painterly vector, caldo e family-friendly), generate via ComfyUI:
+
+| Agente | Animale | Stato |
+|--------|---------|-------|
+| Main Assistant | 🦊 Volpe | ✅ |
+| Project Coordinator | 🦡 Tasso | ✅ |
+| Researcher | 🐿️ Scoiattolo | ✅ |
+| Generalist | 🦫 Castoro | ✅ |
+| Code Explorer | 🕵️ Meerkat | ✅ |
+| Software Architect | 🏗️ Airone | ✅ |
+| Software Engineer | 🔧 Orso | ✅ |
+| Spec Writer | 📝 Gufo | ✅ |
+| Tech Lead | 👑 Cervo | ✅ |
+| TIC | 👁️ Gatto | ✅ |
+| Business Analyst | 💼 Gazza | ✅ |
+
+- Business Analyst aveva `meta.json` senza campo `icon` — aggiunto.
+- `agents/README.md` riscritto con nuova guida stile Vector Paintings.
+- Stile: `VectorPaintDaal` trigger, palette calde (terracotta, ambra, oro, corallo, teal), animali come personaggi.
+
+### Prossimi passi
+
+- Sviluppare l'app Skald Circle vera e propria