Source-level cleanup with no behavior changes:
- Drop unused React default imports (React 19 auto JSX runtime)
- Hoist CHART_COLORS and add MAX_DOTS_DAYS / MAX_LEGEND_LINES named constants
- Use date-fns addDays/subDays in route helpers (no more setDate mutation)
- Drop dead current:0 field from progress state
- Use format() for export filename (local tz, not UTC)
- Replace key={idx} with composite domain keys in table rows
- Fix border-3 (non-existent in Tailwind v4) -> border-[3px] in spinner
- Fix html lang from "vi" to "en" to match UI language
- Sync description text to "Excel or CSV" across metadata and header
Restructure:
- Rename ExchangeRateViewer.js -> exchange-rate-viewer.js (kebab-case)
- Extract icons, storage helpers, and constants into sibling modules
Replace all inline styles with Tailwind classes, add SVG icons to
action buttons, right-align numeric table cells with tabular-nums,
add sticky table headers, highlight active date preset, improve
empty state with illustration, fix SSR hydration mismatch for
localStorage settings, and make buttons mobile-responsive.
Toggle "Show Chart" displays line chart above the table.
Supports single-bank and comparison mode visualizations.
Also modularized components: extracted tables, status indicators,
and chart into separate files for maintainability.
Toggle fetches both banks simultaneously, merges by date+currency,
and displays side-by-side in a unified table. Bank selector disabled
in compare mode. Export handles comparison data format.
API now accepts currency param (USD, EUR, JPY, ALL, etc.).
Returns array of rates per date instead of single object.
Frontend adds currency dropdown with 12 common currencies plus "All".
- Fetch dates in parallel chunks of 5 instead of sequentially
- Simplify page.js to server component, move default dates into viewer
- Replace showTable with hasFetched for clearer semantics
- Normalize date display to yyyy-MM-dd for both banks
- Remove unused Geist_Mono font import (~50KB savings)
- Change lang to "vi" for Vietnamese bank data context
- Clean up empty blocks and redundant variables in API route
- Add card layout, loading spinner, error/empty states for better UX
- Full dark mode support for date picker, tables, and inputs via CSS vars
- Extract reusable RateTable component, remove duplicate table markup
- Fix CSV injection vulnerability with escapeCsv sanitizer
- Fix URL.createObjectURL memory leak
- Replace JS hover handlers with CSS hover for better performance
- Add aria-live region for screen reader announcements
- Fix metadata from default "Create Next App" to proper title
- Differentiate table stripe/hover colors in light mode
tiennm99
dependabot[bot]