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/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.