palcarazm / bs-darkmode-toggle / 24149212465 / 1

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feat: implement cross-instance synchronization for multiple toggles (#85)

* feat: implement cross-instance synchronization for multiple toggles

Add event-based coordination so multiple toggle instances on the same page
share a single global state. When one toggle changes the theme, all other
toggles automatically update their visual state.

- Add OVERRIDE action to StateReducer for external state updates
- Each instance listens for darkmode:change events on document
- Sync only when ALL root elements are affected by the event
- Update DOM without retriggering storage or events
- Add unit tests for root sharing, partial overlap, and state matching
- Add manual test case for multi-control verification in test app

Implements #60

* fix: remove this unused import of 'TEST_CONSTANTS'

Unnecessary imports should be removed javascript:S1128

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