Add a typed platform package to decouple the frontend from Tauri (#539)

Co-authored-by: Claude Opus 5 <noreply@anthropic.com>

packages/platform/package.json

@@ -0,0 +1,19 @@
+{
+  "name": "@yaakapp-internal/platform",
+  "version": "1.0.0",
+  "private": true,
+  "type": "module",
+  "main": "src/index.ts",
+  "types": "src/index.ts",
+  "scripts": {
+    "lint": "tsc --noEmit"
+  },
+  "dependencies": {
+    "@tauri-apps/api": "^2.11.0",
+    "@tauri-apps/plugin-clipboard-manager": "^2.3.2",
+    "@tauri-apps/plugin-dialog": "^2.7.1",
+    "@tauri-apps/plugin-fs": "^2.5.1",
+    "@tauri-apps/plugin-opener": "^2.5.4",
+    "@tauri-apps/plugin-os": "^2.3.2"
+  }
+}