Phase 24: Design System v2 — analytics-style UI (0.30.0)

- New /api/dashboard/funnel (5-stage stack health, 30s TTL cache) and
  /api/dashboard/summary (containers, daily uptime jsonl, ops activity)
- Token system (tokens.css + Tailwind sp-* aliases); legacy bg/card/accent
  remapped onto the tokens; Schibsted Grotesk bundled via fontsource
- TopNav pill navigation + AppShell replace the sidebar layout (off-canvas
  drawer below 1024px); central display-weight page titles
- Dashboard redesign: FunnelChart (gradient/hatch SVG waterfall), container
  count card with per-host bars + Insights chip, UptimeChart, OpsGrid,
  AiPromptBar; 30/7-day range selector; host sections retained below
- Stacks page honours ?q= / ?filter= deep links + new status-filter select

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

backend/routers/dashboard.py

@@ -0,0 +1,29 @@
+"""Dashboard aggregation endpoints (funnel + summary widgets)."""
+from __future__ import annotations
+
+from fastapi import APIRouter, Depends
+from sqlmodel import Session
+
+from auth import get_current_user
+from database import get_session
+from models.user import User
+from services import dashboard_service
+
+router = APIRouter(prefix="/api/dashboard", tags=["dashboard"])
+
+
+@router.get("/funnel")
+async def funnel(
+    refresh: bool = False,
+    session: Session = Depends(get_session),
+    _user: User = Depends(get_current_user),
+) -> dict:
+    return await dashboard_service.compute_funnel(session, refresh=refresh)
+
+
+@router.get("/summary")
+async def summary(
+    session: Session = Depends(get_session),
+    _user: User = Depends(get_current_user),
+) -> dict:
+    return await dashboard_service.compute_summary(session)