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openspec/changes/archive/2026-02-17-fix-stats-chart-bugs/specs/chart-layout-constraint/spec.md

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+## ADDED Requirements
+
+### Requirement: Chart container boundary enforcement
+The chart SHALL be fully contained within its parent card container without overflow.
+
+#### Scenario: Chart renders within card boundaries
+- **WHEN** the statistics page displays a line chart in a card component
+- **THEN** the chart canvas SHALL NOT extend beyond the card's padding boundaries
+- **AND** the chart SHALL adapt to container resize events
+
+#### Scenario: Chart adapts to mobile viewport
+- **WHEN** the viewport width is less than 375px
+- **THEN** the chart SHALL scale down proportionally
+- **AND** no horizontal scrolling SHALL be required to view the full chart