feature: integrate Sentry SDK for crash reporting on Android and iOS

shared/src/commonMain/kotlin/bzh/ajaury/chombev/SentryHelper.kt

@@ -0,0 +1,20 @@
+package bzh.ajaury.chombev
+
+import io.sentry.kotlin.multiplatform.Sentry
+
+object SentryHelper {
+    fun initializeSentry() {
+        // The DSN is injected at build time from local.properties (or the GLITCHTIP_DSN
+        // environment variable) so it never lands in version control. Without it, crash
+        // reporting is simply disabled.
+        val dsn = BuildSecrets.GLITCHTIP_DSN
+        if (dsn.isBlank()) return
+
+        Sentry.init { options ->
+            options.dsn = dsn
+            options.debug = true
+            options.sendDefaultPii = false
+            options.enableAutoSessionTracking = false
+        }
+    }
+}