Fix Kotlin 2.3.0 compiler warnings while maintaining -Werror

[Copilot]

Kotlin 2.3.0 introduced stricter type inference that detects unnecessary null-safety operators and redundant type casts. The build fails with -Werror enabled due to 7 new warnings across the codebase.

Changes

• Removed unnecessary safe calls: StrongRef?.uri → StrongRef.uri where type is non-null
• Removed redundant null checks: Eliminated if (response.id != null) guards where Kotlin now proves non-nullability
• Removed redundant Elvis operators: it ?: emptyList() → it where left operand is non-nullable
• Removed unnecessary casts: parseHtml(content) as Element → parseHtml(content) where return type is already Element

Files Modified

• data/database/cache/mapper/Bluesky.kt
• data/datasource/misskey/MisskeyDataSource.kt (2 locations)
• data/datasource/misskey/SearchUserPagingSource.kt
• data/datasource/misskey/TrendHashtagPagingSource.kt
• ui/model/mapper/Mastodon.kt
• ui/model/mapper/Misskey.kt

All changes preserve existing behavior while satisfying the improved type system in Kotlin 2.3.0.

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[Copilot]

Just as a heads up, I was blocked by some firewall rules while working on your feedback. Expand below for details.

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:

• central.sonatype.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.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=ALL-UNNAMED --add-opens=java.base/java.util.concurrent.atomic=ALL-UNNAMED --add-opens=java.xml/javax.xml.namespace=ALL-UNNAMED -Xmx8g -Dfile.encoding=UTF-8 -Duser.country -Duser.language=en -Duser.variant -cp (dns block)
• jitpack.io
  • 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.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=ALL-UNNAMED --add-opens=java.base/java.util.concurrent.atomic=ALL-UNNAMED --add-opens=java.xml/javax.xml.namespace=ALL-UNNAMED -Xmx8g -Dfile.encoding=UTF-8 -Duser.country -Duser.language=en -Duser.variant -cp (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)