fix: align dashboard auth cookie with session expiry

fix: session poll must use disableRefresh so sliding TTL is not reset

feat: poll Better Auth get-session on dashboard for expiry logout

feat: add middleware for dashboard route protection

fix: resolve React hydration error #418 in dashboard

feat: add dashboard sub-pages and fix layout routing

update dashboard role routing and sidebar logout flow

add auth flows and reorganize shared frontend structure

- Update dashbaord componets

Initial commit

Initial commit from Create Next App