refactor: remove login page and auth system

feat: add multilingual UI (EN/HI/MR) with language toggle

refactor: code cleanup and App.jsx component split

feat: commit remaining feature work

fix(lint): resolve ESLint errors in App.jsx

feat(docs): implement high-fidelity document translation with style preservation

docs: complete end-to-end documentation overhaul for frontend, backend, and project root

feat(ui): move offline capability and api cost stats to settings page

feat(ui): move Offline Node Status from dashboard to settings page

fix(ui): force responsive styles with !important flags and rebuild frontend

style(ui): refine mobile navbar with full-screen toggle and improved spacing

feat(ui): implement responsive mobile-first design with hamburger menu

docs(readme): update branding and add application preview image

refactor: update project branding and remove BAIF references

feat(ui): restyle frontend to match baif.org.in visual identity

docs: create comprehensive root README and update frontend guide

Initial commit: BAIF Offline Translation Portal with production Dockerfile and recent optimizations