chore(release): bump to 0.30.4

[DennisAlund]

Release prep for 0.30.4, following the CONTRIBUTING.md release process.

What changed

• pubspec.yaml → 0.30.4
• ios/facebook_app_events.podspec → 0.30.4 (kept in sync, otherwise CocoaPods consumers resolve the wrong version)
• CHANGELOG.md: ## Unreleased → ## 0.30.4

Why the heading rename matters

build_deploy.yml builds release notes with awk matching a literal ## <version> heading and exit 1s if it finds none. An ## Unreleased heading would have failed the release job after publishing had already happened.

Version choice

Patch. The release contains one behavioural fix (removing the dead CodelessDebugLogEnabled manifest entry) and documentation changes. No API surface change, nothing breaking.

Pre-flight

• flutter analyze clean
• 66/66 tests pass
• flutter pub publish --dry-run clean apart from the uncommitted-files warning (now committed)
• Release-notes extraction verified against the workflow's own awk expression
• pubspec.yaml and podspec versions match

Graph API pin: check fired, deliberately not acted on

The release-time check added in the previous PR does its job on first use: the pin is v24.0, the current latest is v26.0. Not bumped here. That is a behavioural change and belongs in its own PR with its own review, not folded into a release commit.

Heads up on what merging leads to

Pushing the v0.30.4 tag triggers build_deploy.yml, which runs flutter pub publish --force and then cuts a GitHub Release. That publish is irreversible (pub.dev versions can be retracted but never deleted). I will not push the tag without you confirming.

Separately: docs/ is currently untracked and not gitignored. pub publish includes untracked-but-unignored files, so committing it would ship WEBSITE-HANDOFF.md (revenue figures, pricing, click baselines) to pub.dev. CI publishes from a clean checkout so today's archive is unaffected.

🤖 Generated with Claude Code

[Copilot]

Pull request overview

Prepares the facebook_app_events Flutter plugin for the 0.30.4 release by updating the package version metadata and promoting the changelog entry from “Unreleased” to a versioned heading, aligning with the documented release process and the release-notes extraction workflow.

Changes:

• Bumped the Dart package version to 0.30.4 in pubspec.yaml.
• Kept the CocoaPods spec version in sync by bumping ios/facebook_app_events.podspec to 0.30.4.
• Renamed the top CHANGELOG.md heading from ## Unreleased to ## 0.30.4 to support automated release-notes extraction.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
pubspec.yaml	Updates the package version to 0.30.4 for pub.dev publishing.
ios/facebook_app_events.podspec	Keeps the CocoaPods spec version aligned with the Dart package version (0.30.4).
CHANGELOG.md	Promotes the pending release notes to a versioned ## 0.30.4 heading for the release workflow.

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