Bump targetSdk to 35 and Gradle to 8.1.0

[pimpimmi]

Summary

• Bump compileSdk/targetSdk to 35 and minSdk to 21 for both library and sample app
• Bump Android Gradle Plugin to 8.7.3 and Gradle wrapper to 8.11.1
• Bump Robolectric from 4.11.1 to 4.14.1 for SDK 35 test support
• Remove Jetifier (android.enableJetifier) — not needed with pure AndroidX dependencies
• Bump version to 4.0.2

Breaking change: redirect intent-filter moved to consuming app

AGP 8.x AAPT rejects unresolved ${redirectPathPattern} manifest placeholders in library builds. To resolve this, the RedirectUriReceiverActivity intent-filter has been moved from the library manifest to the consuming app's manifest.

Consumers must add the following to their AndroidManifest.xml:

<activity
    android:name="com.spotify.sdk.android.auth.browser.RedirectUriReceiverActivity"
    android:exported="true">
    <intent-filter android:autoVerify="true">
        <action android:name="android.intent.action.VIEW"/>
        <category android:name="android.intent.category.DEFAULT"/>
        <category android:name="android.intent.category.BROWSABLE"/>
        <data
            android:host="${redirectHostName}"
            android:scheme="${redirectSchemeName}"
            android:pathPattern="${redirectPathPattern}"/>
    </intent-filter>
</activity>

A custom lint rule (MissingRedirectUriIntentFilter) is now shipped with the AAR. If the intent-filter is missing, the consuming app's build will fail with a clear error message.

Other changes

• Added ACTION_VIEW/CATEGORY_BROWSABLE to <queries> for Custom Tabs package visibility on API 35
• New auth-lint-checks module with RedirectUriReceiverActivityDetector

Why

New apps published on Google Play need to target SDK version 35.

Test plan

• Full ./gradlew build passes (294 tasks, all unit tests green)
• Verified lint rule fails build when intent-filter is missing
• Verified lint rule passes when intent-filter is present
• Verified AAR manifest has no baked-in placeholder values
• Verified lint.jar is packaged in the AAR
• Verify sample app runs on a device/emulator

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