docs(33): add summaries for plans 05 and 06 (wave 3 complete)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.planning/phases/33-currency-system/33-05-SUMMARY.md

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+# Plan 33-05 Summary
+
+**Status:** Complete
+**Completed:** 2026-04-13
+
+## What Was Built
+
+Client-side currency system: formatters, market/currency selector, auto-suggestion, conversion toggle.
+
+### Key Changes
+- Added formatDualPrice() for dual display format with ~ prefix
+- Evolved useCurrency() to return CurrencyContext { currency, market, showConversions }
+- Created useExchangeRates hook and convertClientPrice utility
+- Redesigned settings page: "Market & Currency" heading, conversion toggle
+- Added locale-based auto-suggestion banner
+- Updated useFormatters to destructure from CurrencyContext
+
+### Key Files Created/Modified
+- `src/client/lib/formatters.ts` — formatDualPrice added
+- `src/client/hooks/useCurrency.ts` — CurrencyContext interface
+- `src/client/hooks/useFormatters.ts` — Destructure update
+- `src/client/hooks/useExchangeRates.ts` — New hook
+- `src/client/routes/settings.tsx` — Full UI redesign
+
+## Self-Check: PASSED
+- [x] formatDualPrice exports correctly
+- [x] useCurrency returns CurrencyContext
+- [x] Settings page has Market & Currency heading
+- [x] Settings page has Show Converted Prices toggle
+- [x] Auto-suggestion banner present
+- [x] Build succeeds