Add mobile file access sources

shared/src/iosMain/kotlin/com/vnidrop/app/core/PlatformFileAccess.ios.kt

@@ -0,0 +1,24 @@
+package com.vnidrop.app.core
+
+import platform.Foundation.NSURL
+import uniffi.vnidrop.SourceKind
+
+internal actual suspend fun <T> withPlatformPathAccess(
+	kind: SourceKind,
+	value: String,
+	block: suspend () -> T,
+): T {
+	if (kind != SourceKind.IOS_SECURITY_SCOPED_URL) {
+		return block()
+	}
+
+	val url = NSURL.URLWithString(value) ?: NSURL.fileURLWithPath(value)
+	val didStartAccess = url.startAccessingSecurityScopedResource()
+	return try {
+		block()
+	} finally {
+		if (didStartAccess) {
+			url.stopAccessingSecurityScopedResource()
+		}
+	}
+}