fix: pass app version via server load instead of Vite define

The Svelte 5 SSR compiler was optimizing away the __APP_VERSION__
constant set via Vite's define, causing the version to be missing
from the production footer. Use a +layout.server.ts load function
to pass the version from package.json instead.

Also bumps version to 0.1.6.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

vite.config.ts

@@ -1,15 +1,9 @@
-import { readFileSync } from 'node:fs';
 import { sveltekit } from '@sveltejs/kit/vite';
 import { SvelteKitPWA } from '@vite-pwa/sveltekit';
 import tailwindcss from '@tailwindcss/vite';
 import { defineConfig } from 'vite';
 
-const pkg = JSON.parse(readFileSync('package.json', 'utf-8'));
-
 export default defineConfig({
-	define: {
-		__APP_VERSION__: JSON.stringify(pkg.version)
-	},
 	plugins: [
 		tailwindcss(),
 		sveltekit(),