feat: manual start exam workflow via teacher dashboard

fix: change Start Now to 10 min prep and add 5 min late entry grace

fix: enforce unique student names and block late entries

feat: LeetCode split-pane layout + auto-block after 3 violations

fix: change huggingface space SDK to docker

Merge branch 'main' of https://huggingface.co/spaces/Mananjp/examide

initial commit

feat: unified nginx proxy deployment

docker

backend

backend

backend

backend

fix: Update Dockerfiles to use dynamic PORT variable

ci: Add GHCR publishing workflow for Railway deployment

style: Adjust theme contrast

style: Modernize UI with dark glassmorphism design

fix: Correct frontend violation reporting URL

feat: Complete ExamIDE with test cases, auto-judging, scoring, PDF reports, room expiry & Docker