feat: initial smart home dashboard

- Next.js 14 + TypeScript + Tailwind CSS
- Glassmorphism design with ambient orbs
- Cards: Light x2, Temperature, AirPurifier, Tasks, Weather, Savings
- Home Assistant integration (demo mode if no token)
- Vikunja tasks API
- Pulse savings API
- wttr.in weather
- Framer Motion animations
- Dark/light theme toggle
- Bottom navigation
- Dockerfile for deployment

lib/ha.ts

@@ -0,0 +1,19 @@
+export interface HAState {
+  entity_id: string;
+  state: string;
+  attributes: Record<string, any>;
+}
+
+export interface HAStates {
+  demo: boolean;
+  states: Record<string, HAState>;
+}
+
+export function getBrightnessPct(brightness?: number): number {
+  if (!brightness) return 0;
+  return Math.round((brightness / 255) * 100);
+}
+
+export function pctToBrightness(pct: number): number {
+  return Math.round((pct / 100) * 255);
+}