Merge 'introduce package.json for separate *-browser package (both database and sync)' from Nikita Sivukhin

This PR introduces separate `package.browser.json` file for `*-browser`
npm packages (`@tursodatabase/sync-browser` and
`@tursodatabase/database-browser`).
The packages are nearly identical and the only change is `package.json`
content (browser package mentions only WASM optional dependency which
shouldn't confuse NPM and force it to download WASM dep package instead
of native one).
Due to that, innocent "hack" is implemented which swap `package.json`
with `package.browser.json` before publish of `browser` package.

Closes #2906

sync/javascript/.gitignore

@@ -134,3 +134,5 @@ Cargo.lock
 *-draft
 *-synced
 *-info
+
+package.native.json

sync/javascript/Makefile

@@ -0,0 +1,20 @@
+pack-native:
+	npm publish --dry-run && npm pack
+pack-browser:
+	cp package.json package.native.json
+	cp package.browser.json package.json
+	npm publish --dry-run && npm pack; cp package.native.json package.json
+
+publish-native:
+	npm publish --access public
+publish-browser:
+	cp package.json package.native.json
+	cp package.browser.json package.json
+	npm publish --access public; cp package.native.json package.json
+
+publish-native-next:
+	npm publish --tag next --access public
+publish-browser-next:
+	cp package.json package.native.json
+	cp package.browser.json package.json
+	npm publish --tag next --access public; cp package.native.json package.json

sync/javascript/package.browser.json

@@ -0,0 +1,57 @@
+{
+  "name": "@tursodatabase/sync-browser",
+  "version": "0.1.5-pre.2",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/tursodatabase/turso"
+  },
+  "description": "Sync engine for the Turso database library specifically for browser/web environment",
+  "module": "./dist/sync_engine.js",
+  "main": "./dist/sync_engine.js",
+  "type": "module",
+  "exports": "./dist/sync_engine.js",
+  "files": [
+    "browser.js",
+    "dist/**"
+  ],
+  "types": "./dist/sync_engine.d.ts",
+  "napi": {
+    "binaryName": "turso-sync-js",
+    "targets": [
+      "wasm32-wasip1-threads"
+    ]
+  },
+  "license": "MIT",
+  "devDependencies": {
+    "@napi-rs/cli": "^3.0.4",
+    "@napi-rs/wasm-runtime": "^1.0.1",
+    "@types/node": "^24.2.0",
+    "ava": "^6.0.1",
+    "typescript": "^5.9.2"
+  },
+  "ava": {
+    "timeout": "3m"
+  },
+  "engines": {
+    "node": ">= 10"
+  },
+  "scripts": {
+    "artifacts": "napi artifacts",
+    "build": "npm exec tsc && napi build --platform --release --esm",
+    "build:debug": "npm exec tsc && napi build --platform",
+    "prepublishOnly": "npm exec tsc && napi prepublish -t npm --skip-optional-publish",
+    "test": "true",
+    "universal": "napi universalize",
+    "version": "napi version"
+  },
+  "packageManager": "yarn@4.9.2",
+  "imports": {
+    "#entry-point": {
+      "types": "./index.d.ts",
+      "browser": "./browser.js"
+    }
+  },
+  "dependencies": {
+    "@tursodatabase/database": "~0.1.4-pre.5"
+  }
+}