docs(spec): calendar panel with event editing

Sub-project 3. The clock pill opens a month grid beside the selected
day's agenda, and an editor that writes the vdirsyncer calendars
through a small Python tool, calctl, rather than khal: khal 0.11 has no
JSON output and keeps a cache that is a second view of the same files.
Recurrence stops at a plain FREQ and UNTIL, and the form owns one alarm;
anything richer in an existing event reads as custom and survives an
edit untouched.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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