Remove nominative testing, add hideable hints and week streak dots

- Remove the Nominativ level and drop nominative-case testing from mixed/
  possessive/pronoun levels (nominative kept only in reference charts)
- Add persistent hide/show toggles on the two giveaway hint lines in
  practice (noun gender, case/preposition info); state persists in localStorage
- De-spoil "Wechsel im Kontext": remove motion/location hint from answer
  buttons; put sentence translation + preposition meaning behind a toggle
- Add a 7-day practice-history dot strip beside the streak counter
- Extend engine + tests (61 vitest tests)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/App.jsx

@@ -2,7 +2,7 @@ import { useState, useEffect, useCallback, useRef } from "react";
 import {
   DEF, INDEF, STRONG, WEAK, PREPS, PREPS_BY_CASE, CL, CASE_C, GENDER_C,
   PRONOUNS, POSSESSIVES, POSS_ENDINGS, combinePoss, LEVELS,
-  wechselExample, createSession, bumpStreak, currentStreak,
+  wechselExample, createSession, bumpStreak, currentStreak, weekDots,
 } from './engine.js';
 
 // ═══════════════════════════════════════════
@@ -60,7 +60,7 @@ const TABS = [
   {id:'pronoun', label:'Pronouns'},
 ];
 
-const FREE_LEVEL_IDS = new Set([1, 2, 3, 4, 8, 9, 10, 18]);
+const FREE_LEVEL_IDS = new Set([2, 3, 4, 8, 9, 10, 18]);
 const CORE_ARTICLE_CASES = ['nominative', 'accusative', 'dative'];
 const PAYMENTS_ENABLED = import.meta.env.VITE_PAYMENTS_ENABLED === 'true';
 const STRIPE_PLANS = PAYMENTS_ENABLED ? [
@@ -187,6 +187,8 @@ export default function App() {
 
   useEffect(()=>{(async()=>{
     const data = await Storage.get();
+    // Seed the practice-day history for users from before it was tracked.
+    if (data?.ld && !data.days) data.days = { [data.ld]: true };
     if (data) setSt(data);
     let nextAccess = Access.get();
     const params = new URLSearchParams(window.location.search);
@@ -204,6 +206,9 @@ export default function App() {
     await Storage.set(s);
   },[]);
 
+  const hintHidden = k => !!st.hide?.[k];
+  const toggleHint = k => save({...st, hide:{...(st.hide||{}), [k]: !st.hide?.[k]}});
+
   const hasPaidAccess = !!access?.paid;
   const hasAccess = !PAYMENTS_ENABLED || hasPaidAccess;
   const gated = id => PAYMENTS_ENABLED && !hasPaidAccess && !FREE_LEVEL_IDS.has(id);
@@ -311,7 +316,7 @@ export default function App() {
           <div style={{display:'flex',gap:14,alignItems:'center'}}>
             {scr === 'practice' && <button style={S.linkBtn} onClick={()=>setChart(true)}>charts</button>}
             {PAYMENTS_ENABLED && hasPaidAccess && <span style={S.stat}>Unlocked</span>}
-            <span style={S.stat}>🔥 {currentStreak(st)}</span>
+            <StreakBadge st={st}/>
           </div>
         </div>
 
@@ -471,29 +476,32 @@ export default function App() {
 
             <div style={S.translation}>{q.translation}</div>
 
-            <div style={S.keyInfo}>
-              {(q.type === 'article' || q.type === 'chunk') && <>
+            {(q.type === 'article' || q.type === 'chunk') ? (
+              <Hideable hidden={hintHidden('gender')} onToggle={()=>toggleHint('gender')} label="gender" style={S.keyInfo}>
                 <span style={{color: GENDER_C[q.noun.g], fontWeight:700}}>{DEF[q.noun.g].nominative}</span>
                 {' '}{q.noun.w}
                 <span style={S.keyInfoMute}> ({q.noun.en})</span>
-              </>}
-              {q.type === 'poss' && <>
-                <span style={{fontWeight:700}}>{q.stem}-</span>
-                <span style={S.keyInfoMute}> ({q.possMeaning})</span>
-              </>}
-              {q.type === 'pronoun' && <>
-                <span style={{fontWeight:700}}>{q.pron.nom}</span>
-                <span style={S.keyInfoMute}> ({q.pron.en})</span>
-                <span style={S.keyInfoMute}> · {q.pron.tag}</span>
-              </>}
-            </div>
+              </Hideable>
+            ) : (
+              <div style={S.keyInfo}>
+                {q.type === 'poss' && <>
+                  <span style={{fontWeight:700}}>{q.stem}-</span>
+                  <span style={S.keyInfoMute}> ({q.possMeaning})</span>
+                </>}
+                {q.type === 'pronoun' && <>
+                  <span style={{fontWeight:700}}>{q.pron.nom}</span>
+                  <span style={S.keyInfoMute}> ({q.pron.en})</span>
+                  <span style={S.keyInfoMute}> · {q.pron.tag}</span>
+                </>}
+              </div>
+            )}
 
-            <div style={S.secondaryContext}>
+            <Hideable hidden={hintHidden('caseInfo')} onToggle={()=>toggleHint('caseInfo')} label="case" style={S.secondaryContext}>
               <span style={{color: CASE_C[q.cas], fontWeight:600}}>{CL[q.cas]}</span>
               {q.prepKey && <> · {q.prepKey} ({PREPS[q.prepKey].en})</>}
               {q.tw !== null && q.tw !== undefined && <> · {q.tw ? '→ motion' : '● location'}</>}
               {q.type === 'poss' && <> · <span style={{color:GENDER_C[q.noun.g]}}>{DEF[q.noun.g].nominative}</span> {q.noun.w}</>}
-            </div>
+            </Hideable>
 
             {!rev ? (
               (q.type === 'article' || q.type === 'chunk') ? (
@@ -558,21 +566,36 @@ export default function App() {
         {scr === 'practice' && q?.type === 'wechselContext' && (
           <div style={{textAlign:'center', paddingTop:18}}>
             <div style={{...S.sentence, animation:shake?'shake 0.3s':'none'}}>{q.sentence}</div>
-            <div style={S.translation}>{q.translation}</div>
-
-            <div style={S.keyInfo}>
-              <span style={{fontWeight:700}}>{q.prepKey}</span>
-              <span style={S.keyInfoMute}> ({PREPS[q.prepKey].en})</span>
-            </div>
+            {(!hintHidden('meaning') || rev) ? (
+              <>
+                <div style={S.translation}>
+                  {q.translation}
+                  {!rev && <button style={{...S.hintToggle, marginLeft:8}} onClick={()=>toggleHint('meaning')}>hide</button>}
+                </div>
+                <div style={S.keyInfo}>
+                  <span style={{fontWeight:700}}>{q.prepKey}</span>
+                  <span style={S.keyInfoMute}> ({PREPS[q.prepKey].en})</span>
+                </div>
+              </>
+            ) : (
+              <>
+                <div style={S.translation}>
+                  <button style={S.hintToggle} onClick={()=>toggleHint('meaning')}>show translation</button>
+                </div>
+                <div style={S.keyInfo}>
+                  <span style={{fontWeight:700}}>{q.prepKey}</span>
+                </div>
+              </>
+            )}
             <div style={S.secondaryContext}>Wechselpräposition · motion or location?</div>
 
             {!rev ? (
               <div style={{display:'flex',gap:10,justifyContent:'center',maxWidth:340,margin:'8px auto 0'}}>
-                {[['accusative','Akkusativ','1','motion'],['dative','Dativ','2','location']].map(([val,lab,key,hint]) => (
+                {[['accusative','Akkusativ','1'],['dative','Dativ','2']].map(([val,lab,key]) => (
                   <button key={val} style={{...S.choiceBtn, borderColor: CASE_C[val]+'40', minWidth:130}}
                     onClick={()=>doSubmit(val)}>
                     <div style={{fontWeight:700, color: CASE_C[val]}}>{lab}</div>
-                    <div style={{fontSize:11,color:'#999',marginTop:2}}>{hint} · <kbd style={S.kbdSmall}>{key}</kbd></div>
+                    <div style={{fontSize:11,color:'#999',marginTop:2}}><kbd style={S.kbdSmall}>{key}</kbd></div>
                   </button>
                 ))}
               </div>
@@ -711,6 +734,45 @@ function FeatureRequestFooter() {
   );
 }
 
+// A hint line with a persistent hide/show toggle. Hidden stays hidden
+// (across sessions) until the user shows it again — for authentic testing.
+function Hideable({ hidden, onToggle, label, style, children }) {
+  if (hidden) {
+    return (
+      <div style={style}>
+        <button style={S.hintToggle} onClick={onToggle}>show {label}</button>
+      </div>
+    );
+  }
+  return (
+    <div style={style}>
+      {children}
+      <button style={{...S.hintToggle, marginLeft:8}} onClick={onToggle}>hide</button>
+    </div>
+  );
+}
+
+function StreakBadge({ st }) {
+  const dots = weekDots(st);
+  const n = currentStreak(st);
+  const practiced = dots.filter(d=>d.practiced).length;
+  return (
+    <span style={{display:'flex', alignItems:'center', gap:7}}
+      title={`Practiced ${practiced} of the last 7 days · ${n}-day streak`}>
+      <span style={{display:'flex', gap:3, alignItems:'center'}}>
+        {dots.map(d=>(
+          <span key={d.date} style={{
+            width:6, height:6, borderRadius:3,
+            background: d.practiced ? GREEN : '#ddd',
+            boxShadow: d.isToday ? '0 0 0 1.5px #fff, 0 0 0 2.5px #ccc' : 'none',
+          }}/>
+        ))}
+      </span>
+      <span style={S.stat}>🔥 {n}</span>
+    </span>
+  );
+}
+
 function CoreReference() {
   const prepositionGroups = [
     ['accusative', 'Akkusativ', PREPS_BY_CASE.accusative],
@@ -1196,6 +1258,7 @@ const S = {
   checkBtn: { padding:'12px 20px', borderRadius:8, background:GREEN, color:'#fff', border:'none', fontSize:14, fontWeight:700, cursor:'pointer', fontFamily:'inherit' },
   hintText: { fontSize:11, color:'#bbb' },
   kbd: { background:'#f0f0f0', padding:'1px 5px', borderRadius:3, fontSize:10, color:'#888', border:'1px solid #e0e0e0' },
+  hintToggle: { background:'none', border:'none', padding:0, color:'#c2c2c2', fontSize:10, fontWeight:600, textTransform:'uppercase', letterSpacing:0.5, cursor:'pointer', fontFamily:'inherit', textDecoration:'underline', textDecorationStyle:'dotted', textUnderlineOffset:3 },
   kbdSmall: { background:'#f0f0f0', padding:'1px 4px', borderRadius:3, fontSize:9, color:'#888', border:'1px solid #e0e0e0' },
 
   articleGrid: { display:'grid', gridTemplateColumns:'1fr 1fr', gap:10, maxWidth:320, margin:'12px auto 0' },

src/engine.js

@@ -230,14 +230,13 @@ export const ALL_PRONOUN_KEYS = PRONOUNS.map(p=>p.key);
 const SAFE_SUBJECT_KEYS = ['ich','du','er','wir','ihr'];
 
 export const LEVELS = [
-  {id:1, tab:'article', name:'Nominativ', desc:'Gender basics: der, die, or das?', cases:['nominative'], preps:[], type:'article', artType:'definite'},
   {id:2, tab:'article', name:'Akkusativ', desc:'durch, für, gegen, ohne, um', cases:['accusative'], preps:SENTENCE_ACC_PREPS, type:'article', artType:'definite'},
   {id:3, tab:'article', name:'Dativ', desc:'mit, von, zu, aus, bei, nach, seit...', cases:['dative'], preps:PREPS_BY_CASE.dative, type:'article', artType:'definite'},
   {id:4, tab:'article', name:'Wechselpräpositionen', desc:'Two-way: motion (Akk) vs location (Dat)', cases:['accusative','dative'], preps:PREPS_BY_CASE.wechsel, type:'article', artType:'definite', twoWay:true},
   {id:4.5, tab:'article', name:'Kontraktionen', desc:'Fused forms in context: ins, am, zum…', cases:['accusative','dative'], type:'chunk', artType:'definite'},
   {id:5, tab:'article', name:'Genitiv', desc:'trotz, während, wegen, statt...', cases:['genitive'], preps:PREPS_BY_CASE.genitive, type:'article', artType:'definite'},
-  {id:6, tab:'article', name:'Alles gemischt', desc:'All prepositions, definite articles', cases:['nominative','accusative','dative','genitive'], preps:[...SENTENCE_ACC_PREPS,...PREPS_BY_CASE.dative,...PREPS_BY_CASE.genitive,...PREPS_BY_CASE.wechsel], type:'article', artType:'definite', mixed:true},
-  {id:7, tab:'article', name:'ein-Wörter', desc:'Everything with ein/eine/einem...', cases:['nominative','accusative','dative','genitive'], preps:[...SENTENCE_ACC_PREPS,...PREPS_BY_CASE.dative,...PREPS_BY_CASE.genitive,...PREPS_BY_CASE.wechsel], type:'article', artType:'indefinite', mixed:true},
+  {id:6, tab:'article', name:'Alles gemischt', desc:'All prepositions, definite articles', cases:['accusative','dative','genitive'], preps:[...SENTENCE_ACC_PREPS,...PREPS_BY_CASE.dative,...PREPS_BY_CASE.genitive,...PREPS_BY_CASE.wechsel], type:'article', artType:'definite', mixed:true},
+  {id:7, tab:'article', name:'ein-Wörter', desc:'Everything with ein/eine/einem...', cases:['accusative','dative','genitive'], preps:[...SENTENCE_ACC_PREPS,...PREPS_BY_CASE.dative,...PREPS_BY_CASE.genitive,...PREPS_BY_CASE.wechsel], type:'article', artType:'indefinite', mixed:true},
 
   {id:8,  tab:'prep', name:'Häufige Präpositionen', desc:'16 most common prepositions', preps:COMMON_PREPS, type:'prep'},
   {id:9,  tab:'prep', name:'Seltene Präpositionen', desc:'15 less common prepositions', preps:RARE_PREPS,   type:'prep'},
@@ -245,14 +244,14 @@ export const LEVELS = [
   {id:18, tab:'prep', name:'Wechsel im Kontext',    desc:'Real sentences: Akkusativ or Dativ?', preps:PREPS_BY_CASE.wechsel, type:'wechselContext'},
   {id:19, tab:'prep', name:'Kontraktionen',         desc:'Contractions: am, ins, zum, beim…', type:'contraction'},
 
-  {id:11, tab:'poss', name:'Häufige Possessive',   desc:'mein · dein · sein — all cases', possessives:['mein','dein','sein'], cases:['nominative','accusative','dative'], type:'poss'},
-  {id:12, tab:'poss', name:'Schwierige Possessive', desc:'ihr · unser · euer — all cases', possessives:['ihr','unser','euer'], cases:['nominative','accusative','dative'], type:'poss'},
-  {id:13, tab:'poss', name:'Alle gemischt',         desc:'mein, dein, sein, ihr, unser, euer — incl. Genitiv', possessives:['mein','dein','sein','ihr','unser','euer'], cases:['nominative','accusative','dative','genitive'], type:'poss'},
+  {id:11, tab:'poss', name:'Häufige Possessive',   desc:'mein · dein · sein — Akkusativ & Dativ', possessives:['mein','dein','sein'], cases:['accusative','dative'], type:'poss'},
+  {id:12, tab:'poss', name:'Schwierige Possessive', desc:'ihr · unser · euer — Akkusativ & Dativ', possessives:['ihr','unser','euer'], cases:['accusative','dative'], type:'poss'},
+  {id:13, tab:'poss', name:'Alle gemischt',         desc:'mein, dein, sein, ihr, unser, euer — incl. Genitiv', possessives:['mein','dein','sein','ihr','unser','euer'], cases:['accusative','dative','genitive'], type:'poss'},
 
-  {id:14, tab:'pronoun', name:'Singular Pronomen', desc:'ich, du, er, sie, es — all cases', pronouns:SG_PRONOUN_KEYS,      cases:['nominative','accusative','dative'], type:'pronoun'},
-  {id:15, tab:'pronoun', name:'Plural Pronomen',   desc:'wir, ihr, sie — all cases',         pronouns:PL_PRONOUN_KEYS,      cases:['nominative','accusative','dative'], type:'pronoun'},
-  {id:16, tab:'pronoun', name:'Sie (formal)',      desc:'Formal Sie — singular and plural',  pronouns:FORMAL_PRONOUN_KEYS,  cases:['nominative','accusative','dative'], type:'pronoun'},
-  {id:17, tab:'pronoun', name:'Alle gemischt',     desc:'All 10 pronouns, all cases',        pronouns:ALL_PRONOUN_KEYS,     cases:['nominative','accusative','dative'], type:'pronoun'},
+  {id:14, tab:'pronoun', name:'Singular Pronomen', desc:'mich, mir, dich, dir…',            pronouns:SG_PRONOUN_KEYS,      cases:['accusative','dative'], type:'pronoun'},
+  {id:15, tab:'pronoun', name:'Plural Pronomen',   desc:'uns, euch, ihnen…',                pronouns:PL_PRONOUN_KEYS,      cases:['accusative','dative'], type:'pronoun'},
+  {id:16, tab:'pronoun', name:'Sie (formal)',      desc:'Formal Sie — singular and plural', pronouns:FORMAL_PRONOUN_KEYS,  cases:['accusative','dative'], type:'pronoun'},
+  {id:17, tab:'pronoun', name:'Alle gemischt',     desc:'All 10 pronouns, Akkusativ & Dativ', pronouns:ALL_PRONOUN_KEYS,   cases:['accusative','dative'], type:'pronoun'},
 ];
 
 // Contractions (preposition + article). pref:true = preferred even in writing.
@@ -513,13 +512,6 @@ const enNoun = (r, det) => `${det}${det ? ' ' : ''}${r.noun.en}`;
 // QUESTION GENERATORS
 // ═══════════════════════════════════════════
 
-const NOM_TEMPLATES = [
-  {de:'ist hier', en:'is here'},
-  {de:'ist da', en:'is there'},
-  {de:'ist groß', en:'is big'},
-  {de:'ist klein', en:'is small'},
-];
-
 function articleChoices(ans, artType) {
   const pool = artType === 'indefinite'
     ? ['ein','eine','einen','einem','eines','einer','keine','keinen','keiner']
@@ -530,26 +522,8 @@ function articleChoices(ans, artType) {
   return [ans, ...picked].sort(() => Math.random() - 0.5);
 }
 
-function nominativeArticleQ(lv, state) {
-  const noun = NOUN_BY_NAME[drawBag(state, 'noun', NOUNS.map(n=>n.w), state.last.noun)];
-  state.last.noun = noun.w;
-  const tbl = lv.artType === 'indefinite' ? INDEF : DEF;
-  const ans = tbl[noun.g].nominative;
-  const t = pick(NOM_TEMPLATES);
-  return {
-    type:'article', noun, cas:'nominative', prepKey:null, ans,
-    sentence:`_____ ${noun.w} ${t.de}.`,
-    translation:`The ${noun.en} ${t.en}.`,
-    rule:'Subject of the sentence → Nominativ',
-    tw:null, artType:lv.artType, choices:articleChoices(ans, lv.artType),
-  };
-}
-
 export function genArticleQ(level, state = newState()) {
   const lv = LEVELS.find(l=>l.id===level);
-  if (lv.id === 1) return nominativeArticleQ(lv, state);
-  if (lv.mixed && Math.random() < 0.12) return nominativeArticleQ(lv, state);
-
   const prepKey = drawBag(state, 'prep', lv.preps, state.last.prep);
   state.last.prep = prepKey;
   const pc = PREPS[prepKey].c;
@@ -638,15 +612,10 @@ export function genPossQ(level, state = newState()) {
     }
   }
 
-  // No preposition: simple subject/object sentence.
+  // No preposition: simple object sentence.
   const cas = pick(lv.cases.filter(c => c !== 'genitive')) || lv.cases[0];
   let noun, sentence, translation;
-  if (cas === 'nominative') {
-    noun = NOUN_BY_NAME[pickAvoid([...POSSESSABLE], state.last.noun)];
-    const t = pick(NOM_TEMPLATES);
-    sentence = `_____ ${noun.w} ${t.de}.`;
-    translation = `${cap(possMeaning)} ${noun.en} ${t.en}.`;
-  } else if (cas === 'accusative') {
+  if (cas === 'accusative') {
     const t = pick(POSS_ACC_TEMPLATES);
     noun = NOUN_BY_NAME[pickAvoid(t.nouns, state.last.noun)];
     sentence = `Ich ${t.de} _____ ${noun.w}.`;
@@ -668,38 +637,23 @@ export function genPronounQ(level, state = newState()) {
   state.last.pron = pronKey;
   const pron = PRONOUNS.find(p=>p.key===pronKey);
   const cas = pick(lv.cases);
-  const rawAns = pron[{nominative:'nom',accusative:'acc',dative:'dat'}[cas]];
+  const ans = pron[{accusative:'acc',dative:'dat'}[cas]];
 
-  let sentence, translation, ans;
-  if (cas === 'nominative') {
-    const tpl = pick([
-      {v:'kommen', dePart:' aus Berlin', enPart:' from Berlin'},
-      {v:'sein',   dePart:' müde',       enPart:' tired'},
-      {v:'haben',  dePart:' einen Hund', enPart:' a dog'},
-    ]);
-    const vDe = VC[tpl.v].de[pronKey];
-    const vEn = VC[tpl.v].en[pronKey];
-    sentence = `_____ ${vDe}${tpl.dePart}.`;
-    translation = `${cap(pron.en)} ${vEn}${tpl.enPart}.`;
-    ans = cap(rawAns);
+  const subjCandidates = SAFE_SUBJECT_KEYS.filter(k => k !== pronKey);
+  const subjKey = pick(subjCandidates);
+  const subj = PRONOUNS.find(p=>p.key===subjKey);
+  let tpl;
+  if (cas === 'accusative') {
+    tpl = pick([{v:'sehen'}, {v:'kennen'}, {v:'lieben'}]);
   } else {
-    const subjCandidates = SAFE_SUBJECT_KEYS.filter(k => k !== pronKey);
-    const subjKey = pick(subjCandidates);
-    const subj = PRONOUNS.find(p=>p.key===subjKey);
-    let tpl;
-    if (cas === 'accusative') {
-      tpl = pick([{v:'sehen'}, {v:'kennen'}, {v:'lieben'}]);
-    } else {
-      tpl = pick([{v:'helfen'}, {v:'geben', dePost:' das Buch', enPost:' the book'}]);
-    }
-    const sDe = VC[tpl.v].de[subjKey];
-    const sEn = VC[tpl.v].en[subjKey];
-    const dePost = tpl.dePost || '';
-    const enPost = tpl.enPost || '';
-    sentence = `${cap(subj.nom)} ${sDe} _____${dePost}.`;
-    translation = `${cap(subj.en)} ${sEn} ${pron.enObj}${enPost}.`;
-    ans = rawAns;
+    tpl = pick([{v:'helfen'}, {v:'geben', dePost:' das Buch', enPost:' the book'}]);
   }
+  const sDe = VC[tpl.v].de[subjKey];
+  const sEn = VC[tpl.v].en[subjKey];
+  const dePost = tpl.dePost || '';
+  const enPost = tpl.enPost || '';
+  const sentence = `${cap(subj.nom)} ${sDe} _____${dePost}.`;
+  const translation = `${cap(subj.en)} ${sEn} ${pron.enObj}${enPost}.`;
   return {type:'pronoun', pronKey, pron, cas, ans, sentence, translation};
 }
 
@@ -777,11 +731,34 @@ export function localDateStr(d = new Date()) {
 }
 const dayDiff = (a, b) => Math.round((Date.parse(b) - Date.parse(a)) / 864e5);
 
+// Only the trailing window needed for the 7-day dots is kept.
+function pruneDays(days, today) {
+  const keep = {};
+  for (const d of Object.keys(days)) {
+    const diff = dayDiff(d, today);
+    if (diff >= 0 && diff < 14) keep[d] = true;
+  }
+  return keep;
+}
+
 // Called on every answered question. Idempotent within a day.
 export function bumpStreak(st, today = localDateStr()) {
-  if (st.ld === today) return st;
+  if (st.ld === today) {
+    if (st.days?.[today]) return st;
+    return { ...st, days: pruneDays({ ...(st.days || {}), [today]: true }, today) };
+  }
   const streak = st.ld && dayDiff(st.ld, today) === 1 ? (st.streak || 0) + 1 : 1;
-  return { ...st, streak, ld: today };
+  const days = pruneDays({ ...(st.days || {}), [today]: true }, today);
+  return { ...st, streak, ld: today, days };
+}
+
+// The last 7 days (oldest first, today last), flagged with whether the
+// user practiced on each — drives the little dots next to the streak.
+export function weekDots(st, today = localDateStr()) {
+  return Array.from({ length: 7 }, (_, i) => {
+    const key = new Date(Date.parse(today) - (6 - i) * 864e5).toISOString().slice(0, 10);
+    return { date: key, practiced: !!st?.days?.[key], isToday: i === 6 };
+  });
 }
 
 // What to display: a streak is only alive if the last practice was

src/engine.test.js

@@ -4,7 +4,7 @@ import {
   NOUNS, nounForm, LEVELS, CONTRACTIONS, CONTRACTABLE, CHUNK_PREPS,
   POSS_ENDINGS, combinePoss, PRONOUNS, VERBS, PREP_FRAMES,
   createSession, gen, genContractionContextQ, newState, buildChunkChoices,
-  bumpStreak, currentStreak,
+  bumpStreak, currentStreak, weekDots,
 } from './engine.js';
 
 const runSession = (levelId, n) => {
@@ -238,9 +238,22 @@ describe('pronoun questions', () => {
   it.each([14, 15, 16, 17])('level %s: answer matches the pronoun table', (id) => {
     for (const q of runSession(id, 200)) {
       const p = PRONOUNS.find(x => x.key === q.pronKey);
-      const expected = p[{nominative:'nom',accusative:'acc',dative:'dat'}[q.cas]];
-      const want = q.cas === 'nominative' ? expected.charAt(0).toUpperCase() + expected.slice(1) : expected;
-      expect(q.ans).toBe(want);
+      expect(q.ans).toBe(p[{accusative:'acc',dative:'dat'}[q.cas]]);
+    }
+  });
+});
+
+// ── Nominative is never tested ──────────────────────────────
+
+describe('no nominative anywhere', () => {
+  it('no level tests the nominative — you already know der/die/das', () => {
+    expect(LEVELS.some(l => l.name === 'Nominativ')).toBe(false);
+    for (const lv of LEVELS) {
+      if (lv.cases) expect(lv.cases, `level ${lv.id} still lists nominative`).not.toContain('nominative');
+      for (const q of runSession(lv.id, 150)) {
+        if (q.cas) expect(q.cas, `level ${lv.id} generated a nominative question`).not.toBe('nominative');
+        expect(q.ans).not.toBe('nominative');
+      }
     }
   });
 });
@@ -289,6 +302,29 @@ describe('streaks', () => {
     expect(st.streak).toBe(10);
   });
 
+  it('records practice days and prunes old ones', () => {
+    let st = bumpStreak({ streak: 0, ld: null }, '2026-07-01');
+    expect(st.days['2026-07-01']).toBe(true);
+    st = bumpStreak(st, '2026-07-01'); // same day, already recorded
+    expect(Object.keys(st.days).length).toBe(1);
+    st = bumpStreak(st, '2026-07-02');
+    expect(st.days['2026-07-01']).toBe(true);
+    expect(st.days['2026-07-02']).toBe(true);
+    st = bumpStreak(st, '2026-07-20'); // far in the future → old days pruned
+    expect(st.days['2026-07-01']).toBeUndefined();
+    expect(st.days['2026-07-20']).toBe(true);
+  });
+
+  it('weekDots reports the last 7 days, today last', () => {
+    const st = { days: { '2026-07-10': true, '2026-07-12': true, '2026-07-14': true } };
+    const dots = weekDots(st, '2026-07-14');
+    expect(dots.length).toBe(7);
+    expect(dots[0].date).toBe('2026-07-08');
+    expect(dots[6].date).toBe('2026-07-14');
+    expect(dots[6].isToday).toBe(true);
+    expect(dots.map(d => d.practiced)).toEqual([false, false, true, false, true, false, true]);
+  });
+
   it('displays 0 once the streak has lapsed, without needing a new answer', () => {
     const st = { streak: 7, ld: '2026-07-01' };
     expect(currentStreak(st, '2026-07-01')).toBe(7);