chore: bump version to v0.12.0 (#162)

## Summary

- Bump version from 0.11.0 to 0.12.0
- Release includes breaking change (`FaroAssetTracking` replaces
`FaroAssetBundle`), deprecations (`markEventStart`/`markEventEnd`), and
new features (UI activity monitoring, asset load lifecycle signals,
span-driven pending operations)

## Checklist

- [x] CHANGELOG updated
- [x] Version bumped in pubspec.yaml, faro.podspec, build.gradle
- [x] All pre-release checks passed
- [x] `flutter pub publish --dry-run` passed


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<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> **Low Risk**
> Primarily a version/metadata bump plus changelog updates; no
functional code changes are included in this diff.
> 
> **Overview**
> Bumps the SDK/package version from `0.11.0` to `0.12.0` across Dart
(`pubspec.yaml`, `FaroConstants`), Android (`android/build.gradle`), iOS
(`ios/faro.podspec`), and the example app lockfile.
> 
> Adds a `0.12.0` section to `CHANGELOG.md` documenting deprecations and
release notes (including a noted breaking API change and new
user-action/activity tracking features).
> 
> <sup>Written by [Cursor
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Author: robert-northmind

CHANGELOG.md

@@ -7,6 +7,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [0.12.0] - 2026-03-05
+
 ### Deprecated
 
 - `markEventStart()` and `markEventEnd()` are now deprecated. Use

android/build.gradle

@@ -1,5 +1,5 @@
 group 'com.grafana.faro'
-version '0.11.0'
+version '0.12.0'
 
 buildscript {
     repositories {

example/pubspec.lock

@@ -175,7 +175,7 @@ packages:
       path: ".."
       relative: true
     source: path
-    version: "0.11.0"
+    version: "0.12.0"
   ffi:
     dependency: transitive
     description:

ios/faro.podspec

@@ -4,7 +4,7 @@
 #
 Pod::Spec.new do |s|
   s.name             = 'faro'
-  s.version          = '0.11.0'
+  s.version          = '0.12.0'
   s.summary          = 'A new Flutter plugin project.'
   s.description      = <<-DESC
 A new Flutter plugin project.

lib/src/util/constants.dart

@@ -1,7 +1,7 @@
 /// Constants for the Faro Flutter SDK
 class FaroConstants {
   /// The version of the Faro Flutter SDK
-  static const String sdkVersion = '0.11.0';
+  static const String sdkVersion = '0.12.0';
 
   /// The name of the Faro Flutter SDK
   static const String sdkName = 'faro-flutter-sdk';

pubspec.yaml

@@ -1,6 +1,6 @@
 name: faro
 description: Grafana Faro SDK for Flutter applications - Monitor your Flutter app with ease.
-version: 0.11.0
+version: 0.12.0
 homepage: https://grafana.com/oss/faro/
 repository: https://github.com/grafana/faro-flutter-sdk