Fix large QR export layout

[praveenperera]

Summary

• keep animated QR frame indicators within the available width on iOS and Android
• keep the iOS QR image square and within its parent width
• add an iOS regression test with 250 animated QR frames

Root cause

Large transactions create many animated QR frames. The old indicator added a fixed gap for every frame. With enough frames, the gaps made the indicator wider than the screen and expanded the QR layout with it.

User impact

Transaction export QR codes stay fully visible and scannable when the user selects many UTXOs.

Validation

• just fmt
• just clippy
• just lint-swift
• just lint-android
• just compile-android
• just build-ios
• xcodebuild -scheme Cove -sdk iphonesimulator -arch arm64 build-for-testing

The iOS test bundle compiled successfully. No simulator device was installed, so the focused iOS test did not run locally.

[coderabbitai]

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[greptile-apps]

Greptile Summary

The PR keeps animated QR exports within the available width on both mobile platforms and adds platform-specific regression coverage.

• Replaces fixed-gap frame indicators with width-aware Canvas rendering on Android and iOS.
• Constrains the iOS QR image to a square aspect ratio within its parent.
• Adds large-frame-count layout tests for Android and iOS.

Confidence Score: 5/5

The PR appears safe to merge.

No blocking failure remains.

Important Files Changed

Filename	Overview
android/app/src/main/java/org/bitcoinppl/cove/views/QrExportView.kt	Replaces the weighted box row with a Canvas indicator that dynamically reduces spacing to fit the available width.
android/app/src/androidTest/java/org/bitcoinppl/cove/views/QrExportProgressIndicatorTest.kt	Adds the Android large-frame layout and rendering regression test requested by the previous review.
ios/Cove/Views/QrExportContentViews.swift	Uses width-aware Canvas rendering for the iOS frame indicator and removes the QR view’s vertical fixed-size constraint.
ios/Cove/QrCodeView.swift	Keeps generated QR images square while fitting them within the proposed layout.
ios/CoveTests/QrExportLayoutTests.swift	Adds an iOS regression test confirming that a 250-frame indicator fits the available dimensions.
ios/Cove.xcodeproj/project.pbxproj	Registers the new QR export layout test in the Cove test target.

_{Reviews (2): Last reviewed commit: fffd318 | Re-trigger Greptile}

[greptile-apps]

Cover Android Canvas measurement

The new indicator relies on Compose-specific Canvas measurement, density conversion, and pixel rendering for hundreds of frames, but the regression test covers only the SwiftUI implementation. Add an Android layout test using the large frame count so later changes cannot reintroduce overflow, clipping, or collapsed segments on Android.

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