fix(folio): expect/actual testTagsAsResourceId so iOS link succeeds

Compose's androidx.compose.ui.semantics.testTagsAsResourceId is
Android-only. Calling it directly from commonMain broke
linkDebugFrameworkIosSimulatorArm64. Replace with an expect Modifier
extension that wires the semantics on Android and is a no-op on
iOS / wasmJs.

examples/folio/app/shared/src/androidMain/kotlin/app/folio/ui/TestTagBridge.android.kt

@@ -0,0 +1,10 @@
+package app.folio.ui
+
+import androidx.compose.ui.ExperimentalComposeUiApi
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.semantics.semantics
+import androidx.compose.ui.semantics.testTagsAsResourceId
+
+@OptIn(ExperimentalComposeUiApi::class)
+actual fun Modifier.testTagsAsResourceId(): Modifier =
+    semantics { testTagsAsResourceId = true }

examples/folio/app/shared/src/commonMain/kotlin/app/folio/ui/TestTagBridge.kt

@@ -0,0 +1,5 @@
+package app.folio.ui
+
+import androidx.compose.ui.Modifier
+
+expect fun Modifier.testTagsAsResourceId(): Modifier

examples/folio/app/shared/src/iosMain/kotlin/app/folio/ui/TestTagBridge.ios.kt

@@ -0,0 +1,5 @@
+package app.folio.ui
+
+import androidx.compose.ui.Modifier
+
+actual fun Modifier.testTagsAsResourceId(): Modifier = this

examples/folio/app/shared/src/wasmJsMain/kotlin/app/folio/ui/TestTagBridge.wasmJs.kt

@@ -0,0 +1,5 @@
+package app.folio.ui
+
+import androidx.compose.ui.Modifier
+
+actual fun Modifier.testTagsAsResourceId(): Modifier = this