Build all apps from Markdown content; Compose Desktop replaces GTK on Linux and Windows

- content/ + scripts/build-content.py produce content.json for every app
- stable lesson IDs with one-time progress migration (Swift, Kotlin)
- shared answer-check tests (tests/answers.json) for Kotlin and Swift
- android/desktop: Compose app with updater, speech and GTK progress import
- CI packages AppImage and Windows zip with ProGuard, runs the tests

Co-authored-by: Cursor <cursoragent@cursor.com>

content/anglictina/3-rocnik/01-jak-se-to-vyrabi.en.md

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+---
+nazev: How things are made
+popis: The present and past passive. Gaps and a quiz.
+---

content/anglictina/3-rocnik/01-jak-se-to-vyrabi.md

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+---
+id: anglictina-3-jak-se-to-vyrabi
+puvodni: en.3.1
+nazev: Jak se to vyrábí
+popis: Trpný rod v přítomnosti a minulosti. Doplňování a kvíz.
+---
+
+# Výklad
+
+## Když je důležitější děj než původce
+*Passive*
+
+- English is spoken here. The window was broken last night.
+- Původce s by, jen když na něm záleží: The book was written by a nurse.
+- Modální trpný rod: The form must be signed. It can be recycled.
+- Nelze trpně vyjádřit každé sloveso. Happen trpný rod nemá.
+
+> Tip: be + příčestí. Čas nese sloveso be, ne příčestí.
+
+## Od suroviny k věci
+*Popis procesu*
+
+- The beans are picked by hand. They are dried in the sun.
+- The jars were labelled yesterday.
+- Waste paper is collected every Thursday.
+- A new bridge is being built. To už je průběhový trpný rod, zatím stačí ho poznat.
+
+> Tip: first, then, after that, finally. Původce často chybí, protože je obecný.
+
+
+# Doplňování
+
+## This bread ___ (bake) every morning.
+= is baked
+> Přítomný trpný rod.
+
+## The letters ___ (send) yesterday.
+= were sent
+> Minulý trpný rod, množné číslo.
+
+## The poem ___ (write) by a student.
+= was written
+> Write → written.
+
+## These bottles can ___ (recycle).
+= be recycled
+> Modální sloveso + be + příčestí.
+
+## The window ___ (not break) by the wind. Someone hit it.
+= wasn't broken|was not broken
+> Zápor minulého trpného rodu.
+
+
+# Kvíz
+
+## Which sentence is passive?
+- Someone stole my bike.
+- [x] My bike was stolen.
+- My bike stole.
+- Someone was steal my bike.
+> was + stolen.
+
+## The news ___ at ten.
+- is reading
+- are read
+- [x] is read
+- read
+> News je jednotné: is read.
+
+## You ___ wear a badge. The factory requires it, in the passive of must.
+- must be worn a badge
+- [x] A badge must be worn
+- A badge must worn
+- A badge is must wear
+> A badge must be worn.
+
+## They built the school in 1998. → The school ___ in 1998.
+- built
+- [x] was built
+- was build
+- has built
+> was built.

content/anglictina/3-rocnik/02-skola-o-ktere-se-mluvi.en.md

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+---
+nazev: A school people talk about
+popis: Reported statements. Reading and a quiz.
+---

content/anglictina/3-rocnik/02-skola-o-ktere-se-mluvi.md

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+---
+id: anglictina-3-skola-o-ktere-se-mluvi
+puvodni: en.3.2
+nazev: Škola, o které se mluví
+popis: Nepřímá řeč oznamovací. Čtení a kvíz.
+---
+
+# Výklad
+
+## Posun času
+*Reported speech*
+
+- „I am tired.“ → She said she was tired.
+- „I will help.“ → He said he would help.
+- „I have finished.“ → She told me she had finished.
+- „I can't come.“ → He said he couldn't come.
+
+> Tip: said that, told me that. Tell potřebuje osobu, say ne.
+
+## Pořád to platí
+*Kdy čas neposouvat*
+
+- The teacher said that water boils at 100 degrees.
+- She said she lives in Kolín, a pořád tam bydlí.
+- Zájmena se mění podle smyslu: „my book“ → he said his book.
+- Today → that day, tomorrow → the next day, yesterday → the day before. V testu to bude jen u jasných vět.
+
+> Tip: obecné pravdy a situace, které trvají, často zůstávají v přítomném čase.
+
+
+# Čtení
+
+Our head teacher told the local paper that the school was changing. She said that students would start an hour later next term. One pupil told the reporter that he was pleased because he hated early buses. A parent said that she was worried. She said her daughter had joined three clubs and had very little time. The cook said that lunch would still be at noon. He added that the menu was going to include more vegetables.
+
+## What did the head teacher say about the start of school?
+- [x] It would start an hour later
+- It would start at night
+- It had already closed
+- Clubs would end
+> students would start an hour later.
+
+## Why was the pupil pleased?
+- He liked buses
+- [x] He hated early buses
+- He wanted less lunch
+- He had three clubs
+> because he hated early buses.
+
+## What had the daughter done?
+- She had left school
+- [x] She had joined three clubs
+- She had become a cook
+- She had bought a bus
+> had joined three clubs.
+
+## Lunch, according to the cook, …
+- would move to the evening
+- [x] would still be at noon
+- had been cancelled
+- was only vegetables
+> would still be at noon.
+
+
+# Kvíz
+
+## „I am hungry.“ → She said she ___ hungry.
+- is
+- [x] was
+- has
+- were be
+> am → was.
+
+## „I will call.“ → He said he ___ call.
+- will
+- [x] would
+- called
+- has
+> will → would.
+
+## Which verb needs a person?
+- say
+- [x] tell
+- speak that
+- talk that
+> tell somebody.
+
+## She said, „I can't swim.“ → She said she ___.
+- can't swim
+- [x] couldn't swim
+- doesn't swim
+- hasn't swum
+> can → could. V nepřímé řeči o minulém rozhovoru.

content/anglictina/3-rocnik/03-posledni-buk.en.md

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+---
+nazev: The last beech
+popis: Conditionals and environment vocabulary. A podcast and gaps.
+---

content/anglictina/3-rocnik/03-posledni-buk.md

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+---
+id: anglictina-3-posledni-buk
+puvodni: en.3.3
+nazev: Poslední buk
+popis: Podmínky a slovník prostředí. Poslech podcastu a doplňování.
+---
+
+# Výklad
+
+## Konkrétní slova, ne jen nature
+*Prostředí*
+
+- A drought is a long time without rain. Soil is the earth plants grow in.
+- Unless it rains, the young trees will die.
+- If the town banned cars, the air would be cleaner. Teď je nezakázalo, proto would.
+- If people keep using the road, the soil will wash away. To se může stát.
+
+> Tip: drought, soil, volunteer, ban, shortcut. U maturitního tématu zabírají víc než slovo pollution samo.
+
+## Kdo co řekl
+*Podcast*
+
+- Ranger = strážce lesa.
+- Young trees were planted, but many may still die.
+- A shortcut šetří čas a někdy ničí místo.
+- Čísla si zapište: two thousand.
+
+> Tip: u nepřímé řeči v poslechu si pamatujte sloveso řekl/řekla a pak obsah.
+
+
+# Poslech
+
+Last month our class recorded a podcast called The Last Beech. A ranger said that the trees were thirsty because the summers had become hotter. She told us that volunteers had planted two thousand young trees, but she added that many would die unless it rained. If the town banned cars from the forest road, the air would be cleaner. If people keep using it as a shortcut, the soil will wash away.
+
+## What did the ranger say about the trees?
+- [x] They were thirsty
+- They had been cut down
+- They were a shortcut
+- They banned cars
+> the trees were thirsty.
+
+## How many young trees had volunteers planted?
+- Two hundred
+- [x] Two thousand
+- Twenty
+- None
+> two thousand.
+
+## The young trees will die unless…
+- people drive there
+- [x] it rains
+- the podcast ends
+- the soil is sold
+> unless it rained / unless it rains. V textu: unless it rained v nepřímé řeči.
+
+## What would make the air cleaner?
+- [x] Banning cars from the forest road
+- Using the road as a shortcut
+- Cutting the beeches
+- Washing the soil
+> If the town banned cars.
+
+
+# Doplňování
+
+## If we ___ (ban) cars here, the air would be cleaner.
+= banned
+> 2. podmínka.
+
+## The soil will wash away ___ people stop using the shortcut.
+= unless
+> Unless = if not. Pozor: věta chce if not ve významu dokud nepřestanou. Unless people stop = if they don't stop.
+
+## Many young trees ___ (plant) last month.
+= were planted
+> Minulý trpný rod.
+
+## She said the summers ___ (become) hotter.
+= had become
+> Posun předpřítomného času.

content/anglictina/3-rocnik/04-pro-a-proti.en.md

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+---
+nazev: For and against
+popis: Essay structure and linking words. An essay and a quiz.
+---

content/anglictina/3-rocnik/04-pro-a-proti.md

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+---
+id: anglictina-3-pro-a-proti
+puvodni: en.3.4
+nazev: Pro a proti
+popis: Stavba úvahy a spojovací výrazy. Esej a kvíz.
+---
+
+# Výklad
+
+## Úvod, dvě strany, závěr
+*Čtyři kroky*
+
+- Úvod: o čem text je a že existují dva pohledy.
+- Jeden odstavec pro výhody, jeden pro nevýhody.
+- On the one hand … On the other hand …
+- Závěr: váš názor. In my opinion, I believe. Nepřidávejte úplně nový argument.
+
+> Tip: v úvodu otázku neopakujte doslova. Převeďte ji vlastními slovy.
+
+## However není because
+*Spojky*
+
+- School uniforms are cheaper. However, they limit personality.
+- Although uniforms save time, many students hate them.
+- Because dává důvod. So dává výsledek.
+- In conclusion shrnuje. Nepíše se In the conclusion.
+
+> Tip: however stojí mezi větami a odděluje se čárkou. Although spojuje věty v jednu.
+
+
+# Psaní
+
+Write a for-and-against paragraph of at least 50 words about school uniforms. Use however and because, and finish with your opinion using believe.
+
+## Vzorová odpověď
+
+School uniforms are a common argument. They are practical because students do not have to decide what to wear, and families spend less money. However, a uniform hides personality and can feel childish at eighteen. Although it makes mornings faster, it does not make lessons better. I believe schools should keep a simple dress code, but they should not force one jacket on everyone.
+
+## Musí obsahovat
+
+- however
+- because
+- believe
+
+## Minimum slov
+
+50
+
+
+# Kvíz
+
+## Which linker shows contrast?
+- because
+- [x] however
+- so
+- for example
+> However staví protiklad.
+
+## ___ uniforms save time, students still complain.
+- However
+- [x] Although
+- So
+- Believe
+> Although spojuje dvě části jedné věty.
+
+## Choose the best ending of an essay.
+- In conclusion, I have no idea.
+- [x] In conclusion, I believe a simple rule is enough.
+- Because however so.
+- To begin with, the essay starts now.
+> Závěr má názor, ne nový zmatek.
+
+## Because introduces…
+- a result only
+- [x] a reason
+- a list of names
+- a question
+> Because = důvod.

content/anglictina/3-rocnik/05-kdo-to-musel-byt.en.md

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+---
+nazev: It must have been
+popis: Modals of deduction. A short mystery and a quiz.
+---

content/anglictina/3-rocnik/05-kdo-to-musel-byt.md

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+---
+id: anglictina-3-kdo-to-musel-byt
+puvodni: en.3.5
+nazev: Kdo to musel být
+popis: Modální slovesa dedukce. Čtení záhady a kvíz.
+---
+
+# Výklad
+
+## Jisté, možné, vyloučené
+*Dedukce*
+
+- The lights are on. She must be at home.
+- He might be in the lab. I'm not sure.
+- That can't be Eva. Eva is in Vienna this week.
+- O minulosti: must have left, might have forgotten, can't have seen it.
+
+> Tip: must je skoro jistota, might je možnost, can't je „to přece nejde“.
+
+## Čtěte důkazy, ne nadpis
+*Vynález*
+
+- A notebook with today's date is stronger than a guess.
+- Can't have znamená, že to odporuje faktu.
+- Might have nechává dvě možnosti otevřené.
+- Nepoužívejte can pro dedukci v kladné větě. Can umí, must musí být.
+
+> Tip: u must have hledejte důkaz, který už nejde rozumně popřít.
+
+
+# Čtení
+
+Someone left a strange machine in the physics lab. It was warm, so it must have been switched on recently. The only key can't have been used by the caretaker, because he is in hospital. Two students, Nora and Adam, know the code. Nora might have come back after the club, but her train ticket shows she was in Pardubice. Adam's notebook is on the bench and the handwriting matches the label. He must have built it.
+
+## Why must the machine have been on recently?
+- It was noisy
+- [x] It was warm
+- It was new
+- It was labelled
+> It was warm.
+
+## Why can't the caretaker have used the key?
+- He lost it
+- [x] He is in hospital
+- He hates physics
+- He was in Pardubice
+> he is in hospital.
+
+## Where was Nora?
+- In the lab
+- [x] In Pardubice
+- In hospital
+- On the bench
+> her ticket shows Pardubice.
+
+## Who must have built the machine?
+- The caretaker
+- Nora
+- [x] Adam
+- Nobody
+> The notebook and the handwriting point to Adam.
+
+
+# Kvíz
+
+## The window is broken and his bag is gone. He ___ left in a hurry.
+- [x] must have
+- must
+- can have
+- should
+> Minulá skoro jistota: must have left.
+
+## That ___ be Lea. Lea is abroad.
+- must
+- [x] can't
+- should
+- is
+> Odporuje faktu: can't.
+
+## I'm not sure. They ___ have missed the bus.
+- must
+- can't
+- [x] might
+- are
+> Možnost: might have.
+
+## Which sentence is a deduction, not a duty?
+- You must wear gloves.
+- [x] She must be tired.
+- You must sign this.
+- Visitors must wait.
+> She must be tired je úsudek.

content/anglictina/3-rocnik/06-zpravy-dne.en.md

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+---
+nazev: The news desk
+popis: Reported questions. An interview and a quiz.
+---

content/anglictina/3-rocnik/06-zpravy-dne.md

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+---
+id: anglictina-3-zpravy-dne
+puvodni: en.3.6
+nazev: Zprávy dne
+popis: Nepřímé otázky. Poslech rozhovoru a kvíz.
+---
+
+# Výklad
+
+## Otázka se v nepřímé řeči narovná
+*Reported questions*
+
+- „Where do you live?“ → She asked me where I lived.
+- „Did you see it?“ → He asked if I had seen it.
+- Whether a if jsou u zjišťovacích otázek obě možné.
+- Tázací výraz zůstává: what, where, why, how long.
+
+> Tip: žádný otazník a pořadí podmětu a slovesa jako v oznamovací větě.
+
+## Novinář se ptá starosty
+*Redakce*
+
+- Asked if the bridge was safe.
+- Wondered how long the repairs would take.
+- The mayor said he didn't know yet.
+- Slovesa ask, wonder, want to know.
+
+> Tip: v poslechu odlište otázku reportéra od odpovědi starosty.
+
+
+# Poslech
+
+Reporter: Mayor, is the old bridge safe? Mayor: I can't promise that. An engineer told me that two cables were weak. Reporter: How long will the repairs take? Mayor: She asked the firm the same question yesterday. They said they didn't know yet. Reporter: Did anyone complain? Mayor: A shopkeeper asked me why the bus stop had moved. I asked her if she could wait until Friday. Reporter: Will you close the bridge? Mayor: We might. I have asked the police whether they can send officers tonight.
+
+## What did the engineer tell the mayor?
+- The bridge was new
+- [x] Two cables were weak
+- The shop was closed
+- Friday was impossible
+> two cables were weak.
+
+## What didn't the firm know?
+- The mayor's name
+- [x] How long the repairs would take
+- Where the bus stop was
+- Who the police were
+> They said they didn't know yet. Šlo o délku oprav.
+
+## What did the shopkeeper ask?
+- [x] Why the bus stop had moved
+- If the mayor could swim
+- Where the cables were made
+- Whether Friday was a holiday
+> why the bus stop had moved.
+
+## Who might come tonight?
+- The firm
+- The shopkeeper
+- [x] Police officers
+- The engineer only
+> whether they can send officers tonight.
+
+
+# Kvíz
+
+## „Where do you live?“ → He asked me where I ___.
+- did live
+- [x] lived
+- do live
+- living
+> Pořadí oznamovací věty: where I lived.
+
+## „Are you ready?“ → She asked if I ___.
+- [x] was ready
+- am I ready
+- ready was
+- did ready
+> if I was ready.
+
+## Which sentence is wrong?
+- He asked where she was.
+- [x] He asked where was she.
+- He asked if she was tired.
+- He wanted to know why she had left.
+> V nepřímé otázce není inverze.
+
+## Whether means about the same as…
+- because
+- [x] if
+- however
+- whose
+> Whether ≈ if v nepřímé zjišťovací otázce.

content/anglictina/3-rocnik/07-frazova-slovesa-v-pribehu.en.md

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+---
+nazev: Phrasal verbs in a story
+popis: Common phrasal verbs. Gaps and a quiz.
+---

content/anglictina/3-rocnik/07-frazova-slovesa-v-pribehu.md

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+---
+id: anglictina-3-frazova-slovesa-v-pribehu
+puvodni: en.3.7
+nazev: Frázová slovesa v příběhu
+popis: Běžná frázová slovesa. Doplňování a kvíz.
+---
+
+# Výklad
+
+## Look není look after
+*Částice mění význam*
+
+- look after = starat se, look for = hledat, look forward to = těšit se.
+- give up = vzdát se, find out = zjistit, run out of = dojít zásoba.
+- turn off = vypnout, take off = sundat nebo vzlétnout, get on = nastoupit i vycházet.
+- Look forward to je následované -ing: I look forward to seeing you.
+
+> Tip: frázové sloveso se učte jako jednu jednotku, s českým protějškem ve větě.
+
+## Jedno sloveso, jedna situace
+*Příběh*
+
+- The bus took off není o oblečení. U letadla ano, u autobusu spíš pulled away.
+- Take off a coat = sundat. Take off = vzlétnout. Kontext rozhoduje.
+- Get on with somebody = vycházet s někým.
+- Run out of time je u testu častější než run out time.
+
+> Tip: když částici neznáte, představte si gesto. Off je pryč, up je do konce.
+
+
+# Doplňování
+
+## Can you look ___ my dog this weekend?
+= after
+> Look after = postarat se.
+
+## We are looking ___ to the trip.
+= forward
+> Look forward to.
+
+## Don't give ___. The last chapter is the best.
+= up
+> Give up = vzdát to.
+
+## I need to find ___ who left the note.
+= out
+> Find out = zjistit.
+
+## We've run ___ of milk.
+= out
+> Run out of.
+
+
+# Kvíz
+
+## Please turn ___ the lights.
+- [x] off
+- after
+- forward
+- out of
+> Turn off = vypnout.
+
+## She gets ___ well with her neighbours.
+- [x] on
+- off
+- up
+- after
+> Get on with = vycházet.
+
+## He took ___ his wet coat.
+- [x] off
+- up to
+- after
+- forward
+> Sundat: take off.
+
+## I look forward to ___ you.
+- see
+- [x] seeing
+- saw
+- seen
+> To je předložka, následuje -ing.

content/anglictina/3-rocnik/08-test-3-rocniku.en.md

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+---
+nazev: Year 3 test
+popis: Reading, listening, B1+ grammar and a short argument.
+---

content/anglictina/3-rocnik/08-test-3-rocniku.md

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+---
+id: anglictina-3-test-3-rocniku
+puvodni: en.3.8
+nazev: Test 3. ročníku
+popis: Čtení, poslech, gramatika B1+ a krátká úvaha.
+---
+
+# Výklad
+
+## Trpný rod, řeč, podmínky, dedukce
+*B1+*
+
+- was written, must be signed, is spoken.
+- said she would, asked where I lived.
+- If they banned cars, the air would be cleaner.
+- must have, might have, can't have.
+
+> Tip: u trpného rodu hledejte be. U nepřímé otázky žádnou inverzi.
+
+## However a because v jednom textu
+*Úvaha ve zkratce*
+
+- Neopakujte zadání první větou.
+- Phrasal verbs nechte ve správné částici. Look after není look for.
+- Told me, ne said me.
+- In conclusion je až na konci, ne v úvodu.
+
+> Tip: jedna výhoda, jeden háček, jedna věta s názorem.
+
+
+# Čtení
+
+A repair café opened in a former bakery. Broken radios are mended there on Saturdays. The founder said that people would rather repair than buy if they were shown how. She told a reporter that twenty kettles had been saved in March. Visitors have to bring the broken object, but they don't have to pay. If the café closed, a lot of working parts would be thrown away.
+
+## What happens to radios there?
+- They are sold
+- [x] They are mended
+- They are banned
+- They are thrown away at once
+> are mended.
+
+## How many kettles had been saved in March?
+- Twelve
+- [x] Twenty
+- Two thousand
+- None
+> twenty kettles.
+
+## What would happen if the café closed?
+- [x] Parts would be thrown away
+- Radios would be cheaper
+- People would pay more
+- The bakery would reopen as a shop
+> working parts would be thrown away.
+
+
+# Poslech
+
+Editor: Did the mayor answer you? Journalist: I asked him whether the bridge was safe. He said he didn't know. I also asked how long the repairs would take. He told me that the firm hadn't decided. A resident asked me why the paper hadn't printed a map. I said we would print one tomorrow.
+
+## What did the journalist ask about safety?
+- [x] Whether the bridge was safe
+- If the paper was closed
+- Where the mayor lived
+- Why kettles break
+> whether the bridge was safe.
+
+## What hadn't the firm done?
+- [x] Decided
+- Printed a map
+- Closed the paper
+- Asked the resident
+> hadn't decided.
+
+## What did the journalist promise?
+- To close the bridge
+- [x] To print a map tomorrow
+- To repair the cables
+- To interview a baker
+> we would print one tomorrow.
+
+
+# Psaní
+
+In at least 40 words, give one reason for repairing things and one objection. Use because and however.
+
+## Vzorová odpověď
+
+Repairing things matters because a kettle can work for years after a small fix. However, some people do not have the tools or the time, so a café where volunteers help is a fair idea. I believe every town should have one quiet room for broken objects. It is slower than shopping, but it is kinder.
+
+## Musí obsahovat
+
+- because
+- however
+
+## Minimum slov
+
+40
+
+
+# Kvíz
+
+## The cake ___ by a student.
+- baked
+- [x] was baked
+- was bake
+- has bake
+> was baked.
+
+## She asked me where I ___.
+- did live
+- [x] lived
+- do live
+- living
+> where I lived.
+
+## He ___ be at school. I just saw him there.
+- can't
+- [x] must
+- mustn't
+- should to
+> Skoro jistota: must.
+
+## Please look ___ the tickets. I can't find them.
+- [x] for
+- forward
+- after
+- up of
+> Look for = hledat. Look after by bylo hlídat.