Fix financial export array binding and add SVG favicon

- Replace raw `ANY(${array})` SQL with drizzle's inArray() in
  src/lib/server/export/financial.ts; the raw form sent UUID arrays
  in a malformed Postgres array literal causing 500 on download
- Add static/favicon.svg (Thai baht symbol on blue square) and point
  app.html at it; remove the empty favicon.png
- Redirect /favicon.ico to /favicon.svg in hooks.server.ts so
  browsers' implicit fallback request stops 404'ing

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

static/favicon.svg

@@ -0,0 +1,4 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 32 32">
+  <rect width="32" height="32" rx="6" fill="#2563eb"/>
+  <text x="16" y="22" font-family="system-ui, -apple-system, sans-serif" font-size="18" font-weight="700" text-anchor="middle" fill="#ffffff">฿</text>
+</svg>