version 1.1.0

CHANGELOG.md

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+# CHANGELOG
+
+## [1.1.0] : Refactor and Optimization
+
+### Performance
+* **IntlCache**: Implemented caching for `Intl` objects. Date formatting no longer creates new instances on every refresh.
+* **Shared Styles**: Used `adoptedStyleSheets` instead of `<style>` tags. The browser parses CSS only once.
+* **Date Math**: Removed `while` loops for year/month calculations. Replaced them with faster O(1) mathematical formulas.
+
+### Stability and UI
+* **Layout Shift (CLS)**: Fixed content jumping on load. The component now has a default `min-height`.
+* **Initialization**: Added a non-breaking space (`\u00A0`) at start. This prevents zero height before the first render.
+* **TickHub Safety**: Iteration over subscribers now uses a copy. An error in one timer will not stop others.
+
+### Code Quality
+* **Private Fields**: Changed `_variable` convention to native private fields `#variable`. Internal state is now fully protected.
+* **Attribute Handling**: Improved attribute update logic (`#isAttrUpdate`). This eliminates unnecessary render cycles.
+* **Auto-restart**: The stopped timer restarts automatically if the target date changes to the future.
+* **Fallback**: Added a safety check returning `00:00:00` if formatting results in an empty string.
+
+## [1.0.1] : Added README.md
+
+## [1.0.0] : First version