Feature/frontend unification

[thiago4int]

• Added full resume workflow inside the Kanban modal: generate, edit, save, and export.
• Implemented backend export endpoints using Pandoc (PDF/DOCX).
• Polished Kanban UI (header layout, modal, Markdown preview).
• Updated docs (README, CHANGELOG).
• Dockerized with Pandoc in kanban_api image.

What’s Included

• Frontend
  • frontend/src/pages/KanbanPage.js: Save notice, Export PDF/DOCX, blob download helper, sanitization of code fences on save.
  • frontend/src/api/kanban.js: exportLatestResume(), exportResumeById().
  • CSS polish: modal layout, sticky header, markdown preview.
• Backend
  • kanban_api/app/routes_resumes.py: Export endpoints using Pandoc:
    • GET /resumes/{resume_id}/export?format=pdf|docx
    • GET /resumes/applications/{application_id}/export?format=pdf|docx (latest)
  • kanban_api/Dockerfile: installs pandoc.
• Docs
  • README.md: UI steps + API usage for save/export.
  • CHANGELOG.md: entries for resume save/export and UI fixes.

How to Test

• docker compose up -d --build
• Frontend: http://localhost:8080
• API docs: http://localhost:8000/docs
• In Kanban → Resume tab: AI Generate → Save to Card → Export PDF/DOCX.

Next Steps

• Optional “Previous Resumes” list with quick exports.
• Export toasts/loading, validation, template styling options for Pandoc.
• Add tests for export endpoints and CI checks."
  --base main
  --head feature/frontend-unification