v6 Phase A: Dashboard & Toolbar

- 'Dein Stack' zeigt echtes Modell (Dateiname) hinter coder/scout/vision.
- Top-News-Karte auf der Uebersicht (neben Stack).
- Toolbar-Update-Badges: /api/updates (OS via apt-Cache + Modell-Upgrades),
  klickbar -> Server bzw. News. compute_upgrades aus cookbook wiederverwendet.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

static/css/components.css

@@ -148,6 +148,10 @@ textarea{resize:vertical;min-height:64px;font-family:var(--sans)}
 .info-dot{display:inline-flex;vertical-align:-3px;color:var(--dim);cursor:help;margin-left:5px}
 .info-dot svg{width:14px;height:14px}
 .info-dot:hover{color:var(--accent)}
+.upd-badge{font-size:11.5px;padding:4px 10px;border-radius:999px;cursor:pointer;white-space:nowrap;
+  background:rgba(68,147,224,.14);color:#86b9ff;border:1px solid rgba(68,147,224,.25)}
+.upd-badge.warn{background:rgba(224,163,46,.14);color:#f0c570;border-color:rgba(224,163,46,.25)}
+.upd-badge:hover{filter:brightness(1.12)}
 .mono-sm{font-family:var(--mono);font-size:11.5px;color:var(--mut)}
 
 /* ---- Buttons ---- */