chore: logo correction

minor design fixes

code refactor and shadcn UI

code refactors

chores: ShadCN ui migrate

fix: shadcn color token cleanup

code refactor: TestEngine.jsx

refactor: calculator and question card jsx

perf: optmize testengine

light mode fix

del checklist and add more admin controls

frontend and DB code refactor

add: tests

perf: SWR and optimization

img upload and overflow fix

mobile optimized UI

refactor/perf: light/dark mode + add tests + optimize

initial commit