Harden Android accessibility, localization and startup (#105)

Implement independent hardening and regression coverage. Keep #105 open for final feature and environment coverage after #106–#110; document the completion boundary and resume order.

android/performance/src/main/AndroidManifest.xml

@@ -0,0 +1 @@
+<manifest />

android/performance/src/main/kotlin/de/rfc1437/ironstorage/performance/BaselineProfile.kt

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+package de.rfc1437.ironstorage.performance
+
+import android.os.Build
+import androidx.benchmark.macro.junit4.BaselineProfileRule
+import androidx.test.uiautomator.By
+import androidx.test.uiautomator.Until
+import org.junit.Assert.assertNotNull
+import org.junit.Before
+import org.junit.Rule
+import org.junit.Test
+
+class BaselineProfile {
+    @get:Rule val profile = BaselineProfileRule()
+
+    @Before fun preserveInstalledApplicationData() {
+        // Older non-rooted images can reinstall the app while resetting compilation.
+        check(Build.VERSION.SDK_INT >= 34)
+    }
+
+    @Test fun startupAndPreferences() = profile.collect(
+        packageName = "de.rfc1437.ironstorage"
+    ) {
+        pressHome()
+        startActivityAndWait()
+        val preferences = device.wait(Until.findObject(By.text("Preferences")), 10000)
+        assertNotNull("Preferences navigation must be available", preferences)
+        preferences.click()
+        assertNotNull(
+            "Searchable settings must finish loading",
+            device.wait(Until.findObject(By.text("Search settings")), 10000)
+        )
+    }
+}

android/performance/src/main/kotlin/de/rfc1437/ironstorage/performance/StartupBenchmark.kt

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+package de.rfc1437.ironstorage.performance
+
+import androidx.benchmark.macro.CompilationMode
+import androidx.benchmark.macro.ExperimentalMacrobenchmarkApi
+import androidx.benchmark.macro.StartupMode
+import androidx.benchmark.macro.StartupTimingMetric
+import androidx.benchmark.macro.junit4.MacrobenchmarkRule
+import androidx.test.uiautomator.By
+import androidx.test.uiautomator.Until
+import org.junit.Assert.assertNotNull
+import org.junit.Rule
+import org.junit.Test
+
+@OptIn(ExperimentalMacrobenchmarkApi::class)
+class StartupBenchmark {
+    @get:Rule val benchmark = MacrobenchmarkRule()
+
+    @Test fun coldStart() = startup(StartupMode.COLD)
+
+    @Test fun warmStart() = startup(StartupMode.WARM)
+
+    private fun startup(mode: StartupMode) = benchmark.measureRepeated(
+        packageName = "de.rfc1437.ironstorage",
+        metrics = listOf(StartupTimingMetric()),
+        compilationMode = CompilationMode.Ignore(),
+        startupMode = mode,
+        iterations = 5,
+        setupBlock = { pressHome() }
+    ) {
+        startActivityAndWait()
+        assertNotNull(
+            "Native shell must finish loading",
+            device.wait(Until.findObject(By.text("Home")), 10000)
+        )
+        device.waitForIdle()
+    }
+}