build: fix broken ESLint setup and missing prettier plugin

### Bug Description
Running `yarn lint` crashes completely with the error `ESLint couldn't find the plugin "eslint-plugin-prettier"`.

This happens because `.eslintrc` configures the `prettier` plugin (`"plugins": ["prettier"]` and `"prettier/prettier": ["error"]`), but `eslint-plugin-prettier` was never added to `devDependencies` in `package.json`. Additionally, `.eslintrc` contains leftover boilerplate `ignorePatterns` referencing `packages/preload/...` from an unrelated project template.

### Proposed Solution
- Add `"eslint-plugin-prettier": "^4.2.1"` to `devDependencies` in `package.json`.
- Keep `prettier` at `2.8.8` but downgrade `prettier-plugin-tailwindcss` to `^0.2.8` to maintain compatibility with Prettier 2.x and resolve the `prettier/plugins/angular` module missing error.
- Remove invalid `ignorePatterns` from `.eslintrc`.
- Verified that `yarn lint` now successfully runs across the codebase. I will submit a PR for this!

Start with package.json and .eslintrc, then run yarn lint to reproduce the missing-plugin and Prettier compatibility errors. Check the listed devDependencies and configuration entries against the requested versions and cleanup; done means yarn lint completes successfully across the codebase.

Written by the indexing model from the issue text.