Fix profile media URLs for external hosting

Redesign certificates section with manual grid paging

Add about snapshot and improve mobile chatbot UX

Improve mobile home layout and chatbot replies

Finalize portfolio UI and admin session handling

Polish portfolio UI and chatbot interactions

feat: improve UI

feat: add admin dashboard and portfolio management UI

feat: add admin auth and bucket-backed profile storage

add session memory to AI assistant and update types

setup react frontend layout and resolve node_modules conflict