[AI] Add browser-compatible build for @actual-app/api

The API package was previously Node.js-only due to its dependency on
better-sqlite3 and Node.js fs/path modules. This adds a browser build
that uses loot-core's existing browser platform implementations
(sql.js/WASM, IndexedDB, absurd-sql) instead.

Changes:
- Add index.web.ts: browser entry point (no Node.js version check or
  node-fetch polyfill)
- Add vite.browser.config.ts: browser-targeted Vite build that resolves
  to browser platform files (index.ts) instead of Node.js ones
  (index.api.ts -> index.electron.ts)
- Update package.json: conditional exports (browser vs default/node),
  module field, build:browser script
- Update tsconfig.json: exclude new config file from type checking

The browser build outputs dist/browser.js (ESM) alongside the existing
dist/index.js (CJS/Node). Bundlers that support the "browser" condition
in package.json exports will automatically use the browser build.

https://claude.ai/code/session_01MnxRXLNjqXrVb5CdsC85Fb

packages/api/index.web.ts

@@ -0,0 +1,26 @@
+import { init as initLootCore } from '@actual-app/core/server/main';
+import type { InitConfig, lib } from '@actual-app/core/server/main';
+
+export * from './methods';
+export * as utils from './utils';
+
+/** @deprecated Please use return value of `init` instead */
+export let internal: typeof lib | null = null;
+
+export async function init(config: InitConfig = {}) {
+  internal = await initLootCore(config);
+  return internal;
+}
+
+export async function shutdown() {
+  if (internal) {
+    try {
+      await internal.send('sync');
+    } catch {
+      // most likely that no budget is loaded, so the sync failed
+    }
+
+    await internal.send('close-budget');
+    internal = null;
+  }
+}

packages/api/package.json

@@ -8,23 +8,39 @@
     "dist"
   ],
   "main": "dist/index.js",
+  "module": "dist/browser.js",
   "types": "@types/index.d.ts",
   "exports": {
     ".": {
       "development": "./index.ts",
-      "default": "./dist/index.js"
-    }
+      "browser": {
+        "types": "./@types/index.d.ts",
+        "default": "./dist/browser.js"
       },
-  "publishConfig": {
-    "exports": {
-      ".": {
+      "default": {
         "types": "./@types/index.d.ts",
         "default": "./dist/index.js"
       }
     }
   },
+  "publishConfig": {
+    "exports": {
+      ".": {
+        "browser": {
+          "types": "./@types/index.d.ts",
+          "default": "./dist/browser.js"
+        },
+        "default": {
+          "types": "./@types/index.d.ts",
+          "default": "./dist/index.js"
+        }
+      }
+    }
+  },
   "scripts": {
-    "build": "vite build",
+    "build": "vite build && vite build --config vite.browser.config.ts",
+    "build:node": "vite build",
+    "build:browser": "vite build --config vite.browser.config.ts",
     "test": "vitest --run",
     "typecheck": "tsgo -b && tsc-strict"
   },

packages/api/tsconfig.json

@@ -18,5 +18,12 @@
   },
   "references": [{ "path": "../crdt" }, { "path": "../loot-core" }],
   "include": ["."],
-  "exclude": ["**/node_modules/*", "dist", "@types", "*.test.ts", "*.config.ts"]
+  "exclude": [
+    "**/node_modules/*",
+    "dist",
+    "@types",
+    "*.test.ts",
+    "*.config.ts",
+    "*.browser.config.ts"
+  ]
 }

packages/api/vite.browser.config.ts

@@ -0,0 +1,32 @@
+import path from 'path';
+
+import { defineConfig } from 'vite';
+import peggyLoader from 'vite-plugin-peggy-loader';
+
+const distDir = path.resolve(__dirname, 'dist');
+
+export default defineConfig({
+  build: {
+    target: 'esnext',
+    outDir: distDir,
+    emptyOutDir: false,
+    sourcemap: true,
+    lib: {
+      entry: path.resolve(__dirname, 'index.web.ts'),
+      formats: ['es'],
+      fileName: () => 'browser.js',
+    },
+    rollupOptions: {
+      external: [
+        // These are browser APIs provided by the environment
+        /^node:/,
+      ],
+    },
+  },
+  plugins: [peggyLoader()],
+  resolve: {
+    // Default extensions — picks up browser implementations (index.ts)
+    // instead of .api.ts (which resolves to Node.js/Electron code)
+    extensions: ['.js', '.ts', '.tsx', '.json'],
+  },
+});