feat: redesign my_submissions panel + G2 guardrail rewrite + upload modal improvements

fix(i18n): translate upload.js dynamic strings and info-msg to Vietnamese

feat: add EN/VI language toggle — i18n for all 5 public pages

fix: redirect Track my submission to my_submissions page; update info note

fix: track button hidden inside form — move to outside form in HTML

ui: move My Submissions into account dropdown, remove from nav bar

feat: add My Submissions page — list user's papers with status and review links

ui: update How it works steps to remove email references

ui: merge page-limit checkboxes into one, add desk-reject consequence to topic checkbox

ui: rewrite modal to English — rename to Submission Eligibility, update all 3 checkboxes

feat: add 2 more confirmation checkboxes to upload modal (page limit penalty + NLP topic)

ui: fix modal checkbox font, bold confirm, equalize button widths

feat: add page-limit confirmation modal on file select

ui: remove email field from upload form — drop email notification feature

ui: add ACL ARR page limit note below upload zone

ui: remove ACL ARR Rubric hero badge from upload page

config: reduce max file size from 20MB to 10MB

ui: default theme to light mode; unify footer across all pages

refactor: scope system to ACL ARR only, remove EMNLP/NAACL/COLING references

feat: move theme toggle into account dropdown, add scroll-to-top float button

feat(frontend): account dropdown with Google name in header nav

fix(frontend): wire session-aware nav onto renamed pages after ntp merge

fix: consistent hero badge — Supporting ACL · EMNLP · NAACL · COLING

fix: logo link on upload/review pages now points to home.html

refactor: rename frontend pages — landing→home, index→upload