docs(changelog): add initial changelog for v1.0.0

Author: stefanBid

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),  
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+---
+
+## [1.0.0] - 2025-05-15
+
+### Added
+
+- First stable release of the library.
+- `useSbFloatingPanel` composable:
+  - Placement, strategy, offset configuration.
+  - Dynamic visibility control (`open`, `close`, `toggle`).
+  - Automatic arrow positioning using `@floating-ui/vue`.
+  - Optional width synchronization on resize.
+- `SbContainer` component:
+  - Provides scoped slot with all state and refs.
+  - Automatically wires up floating logic via composable.
+- `SbReference` component:
+  - Interactive element to trigger the panel.
+  - Configurable `as` prop (`button`, `div`, `span`, etc.).
+- `SbFloating` component:
+  - Handles rendering of the floating panel and arrow.
+  - Supports default transitions: `fade`, `scale-fade`, or none.
+  - Accepts style and dimension props for full customization.
+- Fully type-safe API with `TypeScript`.
+- Minimal but flexible scoped styles with optional customization via `class` and `style`.
+
+### Changed
+
+- N/A
+
+### Deprecated
+
+- N/A
+
+### Removed
+
+- N/A
+
+### Fixed
+
+- N/A
+
+---
+