chore: update Angular demo build

[stevensJourney]

Overview

This Angular demo isolated test build is currently failing due to a Node.js typing issue.

Error: src/environment.ts:2:16 - error TS2591: Cannot find name 'process'. Do you need to install type definitions for node? Try `npm i --save-dev @types/node` and then add 'node' to the types field in your tsconfig.
2   supabaseUrl: process.env.WEBPACK_PUBLIC_SUPABASE_URL,
                 ~~~~~~~
Error: src/environment.ts:3:16 - error TS2591: Cannot find name 'process'. Do you need to install type definitions for node? Try `npm i --save-dev @types/node` and then add 'node' to the types field in your tsconfig.
3   supabaseKey: process.env.WEBPACK_PUBLIC_SUPABASE_ANON_KEY,
                 ~~~~~~~
Error: src/environment.ts:4:17 - error TS2591: Cannot find name 'process'. Do you need to install type definitions for node? Try `npm i --save-dev @types/node` and then add 'node' to the types field in your tsconfig.
4   powersyncUrl: process.env.WEBPACK_PUBLIC_POWERSYNC_URL

Failed run: https://github.com/powersync-ja/powersync-js/actions/runs/18650828806/job/53168919561

We currently inject environment variables on process.env via a Webpack plugin. The TypeScript compiler errors due to process.env being a Node.js concept, while this is an Angular app which is meant for web.

We could add Node.js types, but that seems strange since this is a web app. Instead this adds a strict definition file for the injected env.

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Latest commit: 82dad63

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