fahed db6a6ac609 feat: season filter + chart bands on Dashboard and Comparison ...

Dashboard:
- Season dropdown filter (filters data by season date range)
- Revenue trend chart shows colored annotation bands for each season
- All downstream memos use season-filtered data

Comparison:
- Season presets in period selector (optgroup)
- Auto-compares with same season from previous hijri year if defined
- Season preset persists start/end dates in URL

Added chartjs-plugin-annotation for chart bands.

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

2026-03-31 16:10:49 +03:00

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