initial theme picker logic

package.json

@@ -15,6 +15,7 @@
 		"fix": "bunx biome lint --write"
 	},
 	"dependencies": {
+		"@alpinejs/persist": "^3.15.1",
 		"@astrojs/alpinejs": "^0.4.9",
 		"@astrojs/mdx": "^4.3.7",
 		"@astrojs/rss": "^4.0.12",
@@ -32,6 +33,7 @@
 	"devDependencies": {
 		"@astrojs/ts-plugin": "^1.10.4",
 		"@biomejs/biome": "2.3.2",
+		"@types/alpinejs__persist": "^3.13.4",
 		"bun-types": "1.3.0"
 	},
 	"module": "index.ts",