## Overview
Release version 1.2.0 for all packages with SDK constraint updates and
analyzer 8.x migration.

## Changes
### All Packages (playbook, playbook_ui, playbook_snapshot)
- Updated SDK constraint to `^3.8.0`
- Bumped version from 1.1.0 to 1.2.0

### playbook_generator
- **Analyzer 8.x migration**:
  - Migrated from `element2.dart` to `element.dart`
- Updated element access patterns (`ClassFragment` → `ClassElement`,
`TopLevelFunctionFragment` → `ExecutableElement`)
- Replaced deprecated APIs (`librarySource.uri` → `uri`,
`topLevelElements` → specific getters)
- **Dependencies**:
  - analyzer: `^7.4.5` → `^8.0.0`
  - build: `^2.4.1` → `^4.0.0`
  - source_gen: `^2.0.0` → `^4.0.0`
- Bumped version from 1.1.0 to 1.2.0

## Test Instructions
1. Run `melos bootstrap` to update all package dependencies
2. Run `melos analyze` to verify no analysis issues
3. Run `melos test` to ensure all tests pass
4. Test code generation with playbook_generator

## References
- Based on #150 (dependencies and analyzer 8.x migration)
- Based on #151 (workspace configuration)