Add QR code generation from text input

[Copilot]

Adds a new screen for generating QR codes from arbitrary text input, complementing the existing scan functionality.

Changes

• New dependency: ZXing core 3.5.3 for QR code encoding
• GenerateQRViewModel: Encodes text to QR code bitmap via QRCodeWriter, uses bulk setPixels() for efficient bitmap creation
• GenerateQRScreenLayout: Text input field, generate button, and rendered QR code display — styled consistently with existing screens (TopNavBar, shadow utilities, Material3 theming)
• Navigation: GENERATE route added to AppScreen enum and NavHost
• Main screen: Generate QR button added center-bottom in FooterTools (between gallery picker and history)

Usage flow

User taps the QR generate icon on the main screen → enters text → taps "Generate" (or keyboard done action) → QR code bitmap renders below.

// Core generation logic
val bitMatrix = QRCodeWriter().encode(text, BarcodeFormat.QR_CODE, size, size, hints)
val pixels = IntArray(size * size)
for (y in 0 until size) {
    for (x in 0 until size) {
        pixels[y * size + x] = if (bitMatrix[x, y]) Color.BLACK else Color.WHITE
    }
}
val bitmap = Bitmap.createBitmap(size, size, Bitmap.Config.ARGB_8888)
bitmap.setPixels(pixels, 0, size, 0, 0, size, size)

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• dl.google.com
  • Triggering command: /usr/lib/jvm/temurin-17-jdk-amd64/bin/java /usr/lib/jvm/temurin-17-jdk-amd64/bin/java --add-opens=java.base/java.util=ALL-UNNAMED --add-opens=java.base/java.lang=ALL-UNNAMED --add-opens=java.base/java.lang.invoke=ALL-UNNAMED --add-opens=java.prefs/java.util.prefs=ALL-UNNAMED --add-opens=java.base/java.nio.charset=ALL-UNNAMED --add-opens=java.base/java.net=ALL-UNNAMED --add-opens=java.base/java.util.concurrent.atomic=ALL-UNNAMED -Xmx4096m -Dfile.encoding=UTF-8 -Duser.country -Duser.language=en -Duser.variant -cp /home/REDACTED/.gradle/wrapper/dists/gradle-8.4-bin/1w5dpkrfk8irigvoxmyhowfim/gradle-8.4/lib/gradle-launcher-8.4.jar -javaagent:/home/REDACTED/.gradle/wrapper/dists/gradle-8.4-bin/1w5dpkrfk8irigvoxmyhowfim/gradle-8.4/lib/agents/gradle-instrumentation-agent-8.4.jar org.gradle.launcher.daemon.bootstrap.GradleDaemon 8.4 (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

Add feature to generate qr code from input

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