first commit

app/static/js/auth.js

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+(()=>{const F=FuelTrack;F.bindAuth=()=>{const login=F.qs('form.api-login-form');if(login&&!login.dataset.bound){login.dataset.bound='1';login.addEventListener('submit',async e=>{e.preventDefault();try{const r=await fetch('/api/auth/login',{method:'POST',body:new FormData(login),headers:{Accept:'application/json'}}),d=await r.json();if(!r.ok||!d.ok)throw new Error(d.message||'Błąd logowania');location.href=(d.data||{}).redirect||'/'}catch(x){F.notify(x.message,'danger')}})}F.qsa('[data-api-logout]').forEach(a=>{if(a.dataset.bound)return;a.dataset.bound='1';a.addEventListener('click',async e=>{e.preventDefault();const d=await (await fetch('/api/auth/logout',{method:'POST'})).json();location.href=(d.data||{}).redirect||'/login'})})}})();