chore(android): ignore generated Android build output

[guerrini]

expo prebuild / run:android generate apps/betterangels/android/ and
per-module android/build/ directories. Without these entries a local Android
build leaves thousands of untracked files in git status.

The expo-splash-screen dependency that originally accompanied this fix is
already on main, so only the ignore rules remain.

Split out from in-progress referral module work so the build fix can land on its
own. No behaviour change — four lines added to .gitignore, nothing else.

Summary by Sourcery

Build:

• Ignore generated Android project and build output to keep local prebuild and Android build artifacts out of version control.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Adds .gitignore entries to exclude generated Android build output directories from version control, avoiding thousands of untracked files after running Expo Android build commands.

File-Level Changes

Change	Details	Files
Ignore generated Android/Expo build artifacts so local Android builds do not produce untracked files.	Add ignore rule for the generated apps/betterangels/android/ directory created by Expo prebuild/run:android. Add ignore rules for per-module android/build/ directories produced during Android builds. Scope the ignore patterns narrowly to Android build output paths to avoid unintended exclusions. Leave all other ignore rules and project files unchanged; this change is limited to four new lines in the root .gitignore.	.gitignore

---

Tips and commands

Interacting with Sourcery

• Trigger a new review: Comment @sourcery-ai review on the pull request.
• Continue discussions: Reply directly to Sourcery's review comments.
• Generate a GitHub issue from a review comment: Ask Sourcery to create an
  issue from a review comment by replying to it. You can also reply to a
  review comment with @sourcery-ai issue to create an issue from it.
• Generate a pull request title: Write @sourcery-ai anywhere in the pull
  request title to generate a title at any time. You can also comment
  @sourcery-ai title on the pull request to (re-)generate the title at any time.
• Generate a pull request summary: Write @sourcery-ai summary anywhere in
  the pull request body to generate a PR summary at any time exactly where you
  want it. You can also comment @sourcery-ai summary on the pull request to
  (re-)generate the summary at any time.
• Generate reviewer's guide: Comment @sourcery-ai guide on the pull
  request to (re-)generate the reviewer's guide at any time.
• Resolve all Sourcery comments: Comment @sourcery-ai resolve on the
  pull request to resolve all Sourcery comments. Useful if you've already
  addressed all the comments and don't want to see them anymore.
• Dismiss all Sourcery reviews: Comment @sourcery-ai dismiss on the pull
  request to dismiss all existing Sourcery reviews. Especially useful if you
  want to start fresh with a new review - don't forget to comment
  @sourcery-ai review to trigger a new review!

Customizing Your Experience

Access your dashboard to:

• Enable or disable review features such as the Sourcery-generated pull request
  summary, the reviewer's guide, and others.
• Change the review language.
• Add, remove or edit custom review instructions.
• Adjust other review settings.

Getting Help

• Contact our support team for questions or feedback.
• Visit our documentation for detailed guides and information.
• Keep in touch with the Sourcery team by following us on X/Twitter, LinkedIn or GitHub.

[sourcery-ai]

Hey - I've reviewed your changes and they look great!

---

Sourcery is free for open source - if you like our reviews please consider sharing them ✨

• X
• Mastodon
• LinkedIn
• Facebook

_{Help me be more useful! Please click 👍 or 👎 on each comment and I'll use the feedback to improve your reviews.}

[guerrini]

Superseded by #2466, opened from a branch in this repository.