- Backend: /api/eco/calendar accepts date_from + date_to query params
when period=custom; get_calendar() uses them directly without override
Limit raised to 5000 for wide date ranges
- Frontend: "Custom" tab at end of period list; shows two date inputs
(from/to) with Apply button; displays day count; fetches on Apply click
(not on every keystroke to avoid hammering the API)
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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