fix: add comprehensive mobile responsive styles — sidebar collapse, grid stacking, text sizing

chore: remove hire me and gumroad banner

feat: add hire me and gumroad banner to all pages

fix: back button inline (remove position:fixed), body flex-col height

fix: viewport height layout, inline back button, meeting distiller sidebar

restore light theme tools + light landing pages + height fix

fix full-height layout + move back button to top-left

dark theme + back button + mobile responsive

initial deploy