Task EP.1.6.1 Calendar Empty State Rendering Improvement - 2026-07-13

Scope Delivered

updated Calendar Day, Week, and Month views to always render calendar grid cells even when there are zero events
kept Agenda view list-oriented empty state behavior unchanged
added inline empty overlay for Day/Week/Month instead of replacing the calendar surface
added + Add Activity entry point from empty calendar overlay using existing Activity workspace route
kept date/time rendering through src/lib/date-format.ts
preserved Calendar projection, Activity ownership, and Calendar adapter architecture

Reviewed before implementation:

AGENTS.md
plans/task-ep.1.6.1.md
docs/implementation/task-ep1.6-calendar-projection-workspace-big-calendar-foundation-2026-07-13.md
docs/implementation/task-ep1.7-my-day-workspace-foundation-2026-07-13.md
src/features/crm/calendar/components/calendar-workspace.tsx
Calendar API contracts under src/features/crm/calendar/api/types.ts

Day view now renders 12 working-hour slots.
Week view now renders seven day cells.
Month view now renders a 42-cell month grid.
Empty Day/Week/Month views show a lightweight non-blocking overlay with Add Activity action.
Calendar cells remain rendered and selectable via button semantics.
Agenda retains CalendarEmptyState because a list view should show a list empty state.

Empty graphical Calendar views now feel like available scheduling capacity rather than a missing screen.