Port upstream 0.67.0: add twelve preferred currencies from one shared catalog (stacked on #609)

[Finesssee]

Summary

Stacked on #609 (preferred display currency). Adds twelve currencies to the preferred-display-currency catalog: NZD, SEK, NOK, DKK, PLN, BRL, MXN, ZAR, THB, IDR, VND, UAH, appended after TRY in that order with upstream fallback rates. Picker labels are now CODE (symbol) for every entry (e.g. VND (₫), TRY (₺), USD ($)), matching upstream pickerLabel.

Picker order, symbols, and offline rates now come from one catalog: CURRENCIES in rust/src/currency.rs. The frontend imports a generated module (apps/desktop-tauri/src/lib/currencyCatalog.generated.ts) instead of the two hand-maintained lists #609 added. A Rust test regenerates the module text and fails if the checked-in file differs (UPDATE_CURRENCY_CATALOG=1 cargo test -p codexbar currency_catalog rewrites it), so the two sides cannot drift.

Live rate refresh already filters to supported codes (parse_exchange_rates, clean_rates), so live rates for the new codes follow from the catalog with no other change.

Display formatting: formatDisplayCurrency no longer forces maximumFractionDigits: 2; Intl.NumberFormat now uses each currency's own minor units. This keeps zero-decimal currencies (VND, JPY, KRW) from showing fractional units. Note that ICU treats IDR as a 2-decimal currency, so IDR keeps two decimals.

Upstream reference

• Release: CodexBar 0.67.0, preferred currency catalog extension.
• Tag-pinned (v0.67.0): Sources/CodexBarCore/CurrencyExchange.swift (currencies table, pickerLabel); PreferencesGeneralPane.swift (PreferredCurrencyOption); tests UsageFormatterTests.swift, SettingsStoreCoverageTests.swift.
• Rates in the table are copied verbatim from the tagged currencies table (open.er-api.com, 2026-09-24).

Ported / Deferred

Ported: catalog extension, CODE (symbol) labels, single source of truth, USD-pivot conversion for each new code, normalize_preferred_currency acceptance, picker order, zero-decimal formatting.

Deferred: nothing from the spec. The upstream Swift requiresLiveRates / UserDefaults caching has no local delta (already covered by #609's currency-rates.json cache).

Validation

All cargo commands on +1.98.0, E-core wrapper, slot-2.

• cargo +1.98.0 fmt --all: clean
• cargo +1.98.0 clippy --workspace --all-targets -- -D warnings: pass
• cargo +1.98.0 test -p codexbar currency: 15 passed (includes new order/rate/pivot/normalize/live-parse tests and the generated-catalog sync test)
• cargo +1.98.0 test -p codexbar (full): 2143 passed, 0 failed, 1 ignored
• cargo +1.98.0 test -p codexbar-desktop-tauri currency: 3 passed
• vitest run (full): 68 files, 413 tests passed (includes lib/currency.test.ts, GeneralTab.test.tsx picker order and labels)
• pnpm run lint: no findings in touched files (existing warnings elsewhere unchanged)
• pnpm run build: pass

Affected areas

• Settings UI (preferred currency picker options and labels)
• Config file / settings persistence (accepted preferredCurrencyCode values)
• Provider-specific behavior (cost display conversion only)
• Tray panel
• CLI
• Installer / release packaging
• Startup / background behavior
• Documentation

UI proof

Pending: coordinator will capture CUA proof on a fresh build (Settings > General preferred currency picker showing the new options, one selection such as VND applied to a cost amount).

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