1. Add MESSAGE_TAGS to settings.py — Django's messages.error() uses tag
"error" but Bootstrap needs "danger". Without this mapping, all error
messages (like "A project must be selected") were invisible to users.
2. Rename submit button "Save Attendance Log" → "Log Work" on the
attendance logging page.
3. Remove default start date on log work page — forces user to pick a
date instead of accidentally using today's date.
4. Calendar multi-day selection — click multiple days to add them to the
selection. Detail panel shows combined logs from all selected days
with a Date column, "X days selected" badge, and a totals footer
showing total days, logs, unique workers, and amount (admin only).
Click a selected day again to deselect it. Clear button resets all.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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