docs: define suppressed benchmark state

DESIGN.md

@@ -1,7 +1,7 @@
 # Design System — ZarinPal Merchant Analytics
 
 - Status: Draft baseline for approval
-- Version: 0.1.1
+- Version: 0.1.2
 - Last updated: 2026-08-20
 - Direction: Persian-first RTL
 
@@ -105,7 +105,7 @@ Navigation labels should describe merchant tasks, not internal database concepts
 ## Data visualization
 
 - Lead with a written takeaway and exact KPI; charts support the conclusion rather than decorate it.
-- Default comparisons: current period vs previous equivalent period and merchant vs eligible anonymized cohort.
+- Default comparisons: current period vs previous equivalent period and merchant vs an eligible anonymized cohort. Peer values appear only when at least 10 other merchants and 1,000 combined peer sessions contribute; otherwise show a clear insufficient-data state.
 - Always show unit, timezone/calendar, date window, sample size, freshness, and missing-data caveat where material.
 - Success/failure colors remain semantic and consistent. Never use a rainbow categorical palette for ordered values.
 - Tooltips are keyboard reachable and not the sole location of important values.
@@ -142,6 +142,7 @@ Navigation labels should describe merchant tasks, not internal database concepts
 
 | Version | Date | Decision |
 |---|---|---|
+| 0.1.2 | 2026-08-20 | Added the insufficient-data state and visibility threshold for anonymized peer comparisons. |
 | 0.1.1 | 2026-08-20 | Fixed merchant-facing time presentation to the Jalali calendar in `Asia/Tehran`, with explicit UTC API instants. |
 | 0.1.0 | 2026-08-20 | Established ZarinPal-inspired RTL foundation from supplied public/panel screenshots; fixed SvelteKit/Svelte/TypeScript/Tailwind stack; defined responsive shell, core components, accessibility, chart, and motion rules. |