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/1-rocnik/08-test-1-rocniku.md

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+---
+id: anglictina-1-test-1-rocniku
+puvodni: en.1.8
+nazev: Test 1. ročníku
+popis: Čtení, poslech, gramatika a krátké psaní. Úroveň A2.
+---
+
+# Výklad
+
+## A2 v jedné sadě
+*Co test bere*
+
+- Čtení: najděte v textu čas, místo a důvod, nehádejte z jednoho slova.
+- Poslech: jména a čísla si poznamenejte hned.
+- Gramatika: be, přítomné časy, some/any, minulý čas, will a going to.
+- Psaní: krátký souvislý text, ne jen odrážky.
+
+> Tip: nejdřív otázky, pak text nebo nahrávku. U psaní počítejte slova.
+
+## Nejčastější čechismy
+*Jak opravovat*
+
+- I am 16, ne I have 16 years.
+- She likes, ne she like.
+- Did you went je špatně. Did you go.
+- There is a book, ne It is a book on the table, když věc uvádíte.
+
+> Tip: po kontrole si přečtěte nápovědy, i když je věta správně.
+
+
+# Čtení
+
+Klara lives in a flat with her parents and a small dog. On weekdays she walks to school because it is only ten minutes away. She loves art. Last Friday her class visited a gallery and she bought a poster. This Saturday she is meeting her cousin at the station. They are going to a concert in the evening.
+
+## How does Klara get to school?
+- By tram
+- [x] She walks
+- Her dad drives
+- By train
+> she walks to school.
+
+## What did she buy at the gallery?
+- A dog
+- A ticket
+- [x] A poster
+- A flat
+> she bought a poster.
+
+## Who is she meeting on Saturday?
+- Her parents
+- Her art teacher
+- [x] Her cousin
+- The singer
+> meeting her cousin.
+
+
+# Poslech
+
+Hi, it's Marek. I missed you after school. I'm at the sports centre. The match starts at four, not at three, so don't hurry. Can you bring my blue jacket? It's on the chair in the kitchen. See you there.
+
+## Where is Marek?
+- At school
+- [x] At the sports centre
+- In the kitchen
+- On the tram
+> at the sports centre.
+
+## What time does the match start?
+- At three
+- [x] At four
+- At five
+- At ten
+> starts at four, not at three.
+
+## What should his friend bring?
+- A ticket
+- [x] A blue jacket
+- Lunch
+- A poster
+> bring my blue jacket.
+
+
+# Psaní
+
+Write at least 30 words about your family. Use is or are, and the words family and because.
+
+## Vzorová odpověď
+
+My family is not very big. I live with my parents and my younger sister. She is twelve and she is funny. We get on well because we both like films. My dad is a driver and my mum is a nurse. I am happy at home.
+
+## Musí obsahovat
+
+- family
+- because
+
+## Minimum slov
+
+30
+
+
+# Kvíz
+
+## She ___ coffee.
+- don't like
+- [x] doesn't like
+- not like
+- isn't like
+> 3. osoba: doesn't like.
+
+## There ___ any milk.
+- [x] isn't
+- aren't
+- hasn't
+- don't
+> Milk je jednotné: there isn't.
+
+## Yesterday we ___ to the lake.
+- go
+- [x] went
+- gone
+- going
+> Minulý tvar go je went.
+
+## I've got the tickets. We ___ leave at noon.
+- will
+- [x] are going to
+- did
+- are
+> Plán s důkazem: going to.