A drill-down opened from a breakdown row now shows its own period chip and
Month/Week toggle (initialised from S-11, S-11 keeps its own filter), the
header total, a line chart of the group's spend per bucket with the dashed
range average, the trailing 3-bucket moving average and a legend, and a
caption comparing the latest full bucket with the average; the expense rows
follow. Bucket drill-downs are unchanged. The series is the group's column of
AnalyticsState.buckets from spendSeries, so no contract change.
:core:design chart: SpendLineChart and LineLegend beside StackedBarChart,
shared axis/slot helpers (bar chart pixels unchanged), AnalyticsFilterBar
measure and group-by toggles optional.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01TQd3pEP9UeN2uifbHknQ7B
jacobh2
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