fahed 3912b3dd41 polish: fix page title, multi-select styling, chart colors ...

- Page title: "HiHala Data - Museums" -> "HiHala Data"
- Meta description: updated to "Event analytics"
- Multi-select dropdown: fix inherited uppercase, wider to fit labels
- Multi-select arrow: smooth CSS rotation instead of swapping characters
- Chart colors: 10-color palette for events/channels (was 3)
- Remove unused ArcElement (Doughnut) from Chart.js registration (-5KB)
- District chart uses dynamic palette instead of hardcoded 2 colors

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

2026-03-31 15:16:20 +03:00

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