v0.3.0

[Copilot]

Release v0.3.0 with reactive improvements and new helpers.

• $persist helper: Sync reactive properties to localStorage with automatic dependency tracking
• $watch helper: Run tracked functions that re-execute when dependencies change
• $dispatch helper: Dispatch custom events from current element
• .window modifier: Attach event listeners to window instead of element
• nm-bind consolidation: Unified event handling and property binding through single attribute
• $nmData refactor: Improved serialization of reactive data for fetch requests
• CSS transition morph: Smooth transitions when swapping content via AJAX
• Build improvements: Separate build scripts, morph excluded from default AJAX build

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