feat: attach button with camera, gallery, and file picker

Matthias Nott

2026-03-23 07ad99d7c4f8c52930442a34d316e634435bd75a

 pubspec.yaml
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..
@@ -29,6 +29,7 @@
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   mqtt_client: ^10.6.0
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   uuid: ^4.5.1
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   collection: ^1.19.1
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+  file_picker: ^10.3.10
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 dev_dependencies:
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   flutter_test: