Initial commit - Stashpile v0.1

Smart household management frontend for Grocy servers.

Features:
- Dashboard with PulseRing status indicator
- Shopping list with checkable items
- Expiring soon / low stock alerts
- Chores summary
- Quick add with create product flow
- PWA installable

Tech: React 19, TypeScript, Vite, TanStack Router, Zustand, Tailwind CSS

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

public/icons/icon.svg

@@ -0,0 +1,4 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512">
+  <rect width="512" height="512" rx="96" fill="#6B8E6B"/>
+  <text x="256" y="340" font-family="system-ui, sans-serif" font-size="280" font-weight="700" fill="white" text-anchor="middle">S</text>
+</svg>