isolation:isolate on :host — prevents Leaflet's z-index:1000 controls
from escaping the card's stacking context and floating above HA
navigation. Fixes #95.

white-space:nowrap on timestamp, fixed width removed — locale-aware
date strings no longer wrap to a second line in the bottom bar.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>