fix: 4.0.0 bug fixes, CI, example app and smaller package

[yadaniyil]

Release 4.0.0: bug fixes, CI repair, working example app and a smaller package, on top of the material_ui migration from #135.

Fixes #133

Bug fixes

• Incorrect description of ignorePointer #133: the ignorePointer docs said the opposite of what it does.
• BadgeStyle.elevation has drawn no shadow since 3.0.3 (MaterialType.transparency skips it). It now draws a shadow, and the default is 0 so existing badges look the same.
• BadgePosition.center() + onTap jumped to the child's top-left corner.
• centerStart() / centerEnd() were not vertically centered.
• RTL + onTap shifted the badge. The tap padding is now directional.
• Hidden badges (showBadge: false) still caught taps and fired onTap.
• Twitter / Instagram shapes crashed with gradients of 3+ colors.
• toAnimate false → true at runtime left the badge invisible.
• Every rebuild leaked a CurvedAnimation listener.

Each fix has a regression test that fails on the old code. 175 → 199 tests.

Maintenance

• CI: removed the broken "Code Quality" workflow (it used flutter format, which no longer exists). Bumped actions to versions that run on current runners. Added a weekly run and a non-blocking Flutter beta job.
• Publishing: publish.yml now follows pub.dev automated publishing (OIDC via dart-lang/setup-dart, environment: pub.dev, tag vX.Y.Z). The old job hung waiting for a browser login.
• Example app: regenerated the Android / iOS / Windows projects. The old ones (Gradle 6.7, CocoaPods leftovers) no longer built. Fixed the test screen overflowing on phones.
• Package size: added .pubignore, so the archive goes from 7 MB to 176 KB (README GIFs load from GitHub anyway). Untracked generated files.
• Docs: README (build/downloads badges, onTap padding, ignorePointer), CHANGELOG 4.0.0, pubspec topics, AGENTS.md.

Testing

• flutter analyze lib/ test/ example/: no issues. dart format --set-exit-if-changed .: clean. flutter test: 199/199.
• dart pub publish --dry-run: 176 KB.
• iOS simulator + Android emulator: built and ran the example, the test screen and a verification screen for every fix, comparing old vs new screenshots.
  • Every fix shows up as expected.
  • No other visual differences, no runtime errors.
  • Tap tests pass (badge, pass-through, center + onTap, hidden badge).

After merge (maintainer)

• pub.dev → Admin: enable automated publishing for yako-dev/flutter_badges, tag pattern v{{version}}.
• GitHub: create the pub.dev environment.
• Release: push tag v4.0.0.

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