Enable offline post bookmarking for anonymous users

[Copilot]

Anonymous users can now save posts locally without authentication. Previously, save actions were blocked with "login required" toast.

Changes

Database

• Added SavedPost entity (username+id composite key, timestamp, type) with Room DAO
• Migration 31→32 creates saved_posts table with CASCADE delete on account removal

Business Logic

• Extended SaveThing with saveThingLocally()/unsaveThingLocally() methods
• Async operations post callbacks to main thread via Handler to avoid UI crashes
• Logged-in users continue using Reddit API (unchanged)

UI

• Updated save handlers in PostRecyclerViewAdapter, PostDetailRecyclerViewAdapter, ViewPostDetailFragment
• Anonymous users branch to local storage, logged-in users branch to API calls

// Before: blocked anonymous users
if (mAccountName.equals(Account.ANONYMOUS_ACCOUNT)) {
    Toast.makeText(mActivity, R.string.login_first, Toast.LENGTH_SHORT).show();
    return;
}

// After: local storage for anonymous, API for authenticated
if (mAccountName.equals(Account.ANONYMOUS_ACCOUNT)) {
    SaveThing.saveThingLocally(mRedditDataRoomDatabase, mExecutor, 
        mAccountName, post.getId(), SavedPost.TYPE_POST, listener);
} else {
    SaveThing.saveThing(mOauthRetrofit, mAccessToken, 
        post.getFullName(), listener);
}

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-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.nio.charset=ALL-UNNAMED --add-opens=java.base/java.net=ALL-UNNAMED --add-opens=java.base/java.util.concurrent.atomic=ALL-UNNAMED -Xmx2048m -Dfile.encoding=UTF-8 -Duser.country -Duser.language=en -Duser.variant -cp /home/REDACTED/.gradle/wrapper/dists/gradle-8.10.2-bin/a04bxjujx95o3nb99gddekhwo/gradle-8.10.2/lib/gradle-daemon-main-8.10.2.jar -javaagent:/home/REDACTED/.gradle/wrapper/dists/gradle-8.10.2-bin/a04bxjujx95o3nb99gddekhwo/gradle-8.10.2/lib/agents/gradle-instrumentation-agent-8.10.2.jar org.gradle.launcher.daemon.bootstrap.GradleDaemon 8.10.2 (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.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-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.nio.charset=ALL-UNNAMED --add-opens=java.base/java.net=ALL-UNNAMED --add-opens=java.base/java.util.concurrent.atomic=ALL-UNNAMED -Xmx2048m -Dfile.encoding=UTF-8 -Duser.country -Duser.language=en -Duser.variant -cp /home/REDACTED/.gradle/wrapper/dists/gradle-8.10.2-bin/a04bxjujx95o3nb99gddekhwo/gradle-8.10.2/lib/gradle-daemon-main-8.10.2.jar -javaagent:/home/REDACTED/.gradle/wrapper/dists/gradle-8.10.2-bin/a04bxjujx95o3nb99gddekhwo/gradle-8.10.2/lib/agents/gradle-instrumentation-agent-8.10.2.jar org.gradle.launcher.daemon.bootstrap.GradleDaemon 8.10.2 (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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