Make mini-lit a peer dependency in pi-web-ui

- Move mini-lit from dependencies to peerDependencies
- Keep in devDependencies for development
- Prevents bundlers from including mini-lit when consuming pi-web-ui
- Consumer (sitegeist) provides mini-lit, esbuild bundles it once
- Fixes duplicate mini-lit bundling issue permanently

package-lock.json

@@ -5446,7 +5446,6 @@
 			"version": "0.5.44",
 			"license": "MIT",
 			"dependencies": {
-				"@mariozechner/mini-lit": "^0.1.8",
 				"@mariozechner/pi-ai": "^0.5.43",
 				"docx-preview": "^0.3.7",
 				"jszip": "^3.10.1",
@@ -5456,9 +5455,13 @@
 				"xlsx": "^0.18.5"
 			},
 			"devDependencies": {
+				"@mariozechner/mini-lit": "^0.1.8",
 				"@tailwindcss/cli": "^4.0.0-beta.14",
 				"concurrently": "^9.2.1",
 				"typescript": "^5.7.3"
+			},
+			"peerDependencies": {
+				"@mariozechner/mini-lit": "^0.1.8"
 			}
 		}
 	}