refactor(styles): update color palette and improve theme structure for better readability

fix(goals): move action buttons to separate bar to prevent layout overflow on mobile

fix(types): remove undefined assignment for optional search param

fix(transactions): resolve unused imports and integrate ActionButton into TransactionsList

feat(ui): standardize action buttons across all pages with responsive behavior

feat: enhance UX by adding receipt download and improving mobile transaction layout

docs: update README for portfolio - features, architecture, engineering decisions

fix: receipt upload after new transaction - prevent newTransactionId reset on re-render

fix: OCR route - use gemini-2.5-flash and response.text like insight route

fix: exclude PWA files from auth middleware - manifest, sw.js, icons

fix: use Next.js native app/manifest.ts for PWA install support

fix: restore correct dashboard layout, root layout with PWA head tags

fix: PWA manifest MIME type, remove from metadata, add explicit head link

fix: goals amount floating point precision - use Math.round and coerce

fix: goals currentAmount Decimal coercion, manifest cleanup