CMS editor: formatting toolbar with H1-H3, bold, italic, strikethrough,
links, images, lists, blockquotes, code blocks, horizontal rules.
Keyboard shortcuts (Ctrl+B/I/D/K). Improved markdown preview rendering.
Import page: shows current data summary with year badge, stats grid,
last import date. Year input for new imports. Preview with sample table.
Backend: added data_year and data_imported_at fields to TariffParams,
returned in stats endpoint. Import sets data_imported_at automatically.
Seed sets data_year=2018.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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