Add sharing functionality to receive links from other apps

[Copilot]

This PR implements the ability to receive links via Android's sharing mechanism from other apps. Users can now share URLs from browsers, social media apps, or any other app directly to Deepr for saving as deeplinks.

Implementation Details

The implementation adds an Android intent filter to handle ACTION_SEND intents with text/plain MIME type. When a URL is shared to Deepr:

1. The app opens automatically with the save dialog pre-populated
2. The shared URL is validated using the existing isValidDeeplink() function
3. Users can add a name and save the deeplink normally
4. Invalid shared content shows an appropriate error message

Technical Changes

AndroidManifest.xml: Added intent filter to receive share intents

<intent-filter>
    <action android:name="android.intent.action.SEND" />
    <category android:name="android.intent.category.DEFAULT" />
    <data android:mimeType="text/plain" />
</intent-filter>

MainActivity.kt: Extract shared text from incoming intents and pass to UI layer

val sharedText = when {
    intent?.action == Intent.ACTION_SEND -> {
        if (intent.type == "text/plain") {
            intent.getStringExtra(Intent.EXTRA_TEXT)
        } else null
    }
    else -> null
}

Home.kt: Auto-populate save dialog with shared URLs via LaunchedEffect

LaunchedEffect(sharedText) {
    if (!sharedText.isNullOrBlank() && saveDialogInfo == null) {
        if (isValidDeeplink(sharedText)) {
            saveDialogInfo = SaveDialogInfo(sharedText, false)
        } else {
            Toast.makeText(context, "Invalid deeplink from shared content", Toast.LENGTH_SHORT).show()
        }
    }
}

User Experience

• Seamless Integration: Works with Android's native sharing system
• Automatic Population: Save dialog opens instantly with shared URL
• Error Handling: Graceful handling of invalid shared content
• Preserved Functionality: All existing features remain unchanged

Supported Sources

• Web browsers (Chrome, Firefox, Edge, etc.)
• Social media apps (Twitter, Reddit, LinkedIn, etc.)
• Messaging apps (WhatsApp, Telegram, etc.)
• Any app that shares text/plain content containing URLs

The implementation uses minimal, surgical changes that follow existing code patterns and preserve all current functionality while adding this highly requested feature.

Fixes #46.

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 --add-opens=java.base/java.lang=ALL-UNNAMED --add-opens=java.base/java.lang.invoke=ALL-UNNAMED --add-opens=java.base/java.util=ALL-UNNAMED --add-opens=java.prefs/java.util.prefs=ALL-UNNAMED --add-exports=jdk.compiler/com.sun.tools.javac.api=ALL-UNNAMED --add-exports=jdk.compiler/com.sun.tools.javac.util=ALL-UNNAMED --add-opens=java.base/java.util=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 --add-opens=java.xml/javax.xml.namespace=ALL-UNNAMED -Xmx2048m -Dfile.encoding=UTF-8 -Duser.country -Duser.language=en -Duser.variant -cp /home/REDACTED/.gradle/wrapper/dists/gradle-8.13-bin/5xuhj0ry160q40clulazy9h7d/gradle-8.13/lib/gradle-daemon-main-8.13.jar -javaagent:/home/REDACTED/.gradle/wrapper/dists/gradle-8.13-bin/5xuhj0ry160q40clulazy9h7d/gradle-8.13/lib/agents/gradle-instrumentation-agent-8.13.jar org.gradle.launcher.daemon.bootstrap.GradleDaemon 8.13 (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)

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