16k and add tests for mailto schemes (#4)

Task/Issue URL: https://app.asana.com/1/137249556945/project/1208671518894266/task/1211944943901842?focus=true

### Description
Make sure the library is 16k page aligned for android and incidentaly add some more tests

### Steps to test this PR
- [x] `rm -rf ~/.m2/repository/com/duckduckgo/` to nuke the maven local folder
- [x] Build the library with `sh scripts/build_android.sh`
- [x] `cd android` and then `sh release_android.sh --new-version 0.3.4 --bump patch --maven-local` -- This will release the library to maven local
- [x] checkout duckduckgo/Android#7126 from Android repo
- [x] Apply this patch to that branch
```diff
commit 807527950e27d3b7f42978707dc902801ccad483
Author: Aitor Viana <[email protected]>
Date:   Sun Jun 4 20:49:52 2023 -0400

    Maven local use

diff --git a/build.gradle b/build.gradle
index 77ae343b02..6f9f36ec38 100644
--- a/build.gradle
+++ b/build.gradle
@@ -41,6 +41,10 @@ allprojects {
         google()
         mavenCentral()
         maven { url 'https://jitpack.io' }
+//        maven {
+//            url "https://central.sonatype.com/repository/maven-snapshots/"
+//        }
+        mavenLocal()
     }
     configurations.all {
         resolutionStrategy.force 'org.objenesis:objenesis:2.6'

commit 4b326df9339f21e83ee6584f8d560cba32dba9cb
Author: Aitor Viana <[email protected]>
Date:   Tue Nov 18 17:04:25 2025 +0000

    bump to 0.3.4

diff --git a/versions.properties b/versions.properties
index 660fdf03ac..ff5fe9c003 100644
--- a/versions.properties
+++ b/versions.properties
@@ -86,7 +86,7 @@ version.com.duckduckgo.netguard..netguard-android=1.10.2
 
 version.com.duckduckgo.synccrypto..sync-crypto-android=0.7.0
 
-version.com.duckduckgo.urlpredictor..url-predictor-android=0.3.3
+version.com.duckduckgo.urlpredictor..url-predictor-android=0.3.4
 
 version.com.frybits.harmony..harmony=1.2.6
 
```
- [x] Execute `rm -rf build-cache/; ./gradlew clean assembleID`
- [ ] Then run `./scripts/check_elf_alignment.sh ./app/build/outputs/apk/internal/debug/duckduckgo-5.256.0-internal-debug.apk` or whatever the APK is
- [ ] verify `liburl_predictor.so` always appear as aligned

Author: aitorvs

android/ddg-url-predictor/src/test/java/UrlPredictorTest.kt

@@ -39,7 +39,7 @@ class UrlPredictorTests {
     }
 
     @Test
-    fun `telephone number with intl formatting is search`() {
+    fun `telephone number with intl forma  tting is search`() {
         val input = "+351 912 345 678"
         val d = classify(input)
         assertTrue(d is Decision.Search)
@@ -127,4 +127,21 @@ class UrlPredictorTests {
         val d = classify("duck://flags")
         assertTrue(d is Decision.Navigate)
     }
+
+    // ------------------------------------------------------------------------
+    // mailto URLs
+    // ------------------------------------------------------------------------
+
+    @Test
+    fun `mailto google becomes search`() {
+        val d = classify("mailto:[email protected]")
+        assertTrue(d is Decision.Navigate)
+    }
+
+    @Test
+    fun `mailto yahoo becomes search`() {
+
+        val d = classify("mailto:[email protected]")
+        assertTrue(d is Decision.Navigate)
+    }
 }

scripts/build_android.sh

@@ -69,6 +69,9 @@ if [[ -n "${FEATURES}" ]]; then
   FEATURE_FLAGS+=(--features "${FEATURES}")
 fi
 
+# Ensure ELF LOAD segments are aligned to at least 16KB (2**14).
+export RUSTFLAGS="${RUSTFLAGS:-} -C link-arg=-Wl,-z,max-page-size=0x4000 -Wl,-z,common-page-size=16384"
+
 # --- Build per ABI ---
 for ABI in ${ABIS}; do
   echo "==> Building for ABI: ${ABI}"

src/lib.rs

@@ -865,5 +865,14 @@ mod tests {
             Decision::Search { query } if query == "+351 912 345 678"
         ));
     }
+
+    #[cfg(feature = "real-psl")]
+    #[test]
+    fn mailto_urls_become_search() {
+        let p = Policy::default();
+        assert!(matches!(classify("mailto:[email protected]", &p), Decision::Navigate { .. }));
+        assert!(matches!(classify("mailto:[email protected]", &p), Decision::Navigate { .. }));
+        assert!(matches!(classify("mailto:[email protected]", &p), Decision::Navigate { .. }));
+    }
 }