Remove unused String helpers: image(withAttributes:size:), isAlphanumeric

The String.image(...) renderer and both isAlphanumeric() overloads have no
production callers — only their own tests reference them. Drop the helpers
and their tests; UIKit/Foundation imports collapse to Foundation since the
remaining isBlank / isValidEmail need only that.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: dadachi

NativeAppTemplate/Extensions/String+Extensions.swift

@@ -3,39 +3,9 @@
 //  NativeAppTemplate
 //
 
-import UIKit
+import Foundation
 
 extension String {
-    /// Generates a `UIImage` instance from this string using a specified
-    /// attributes and size.
-    ///
-    /// - Parameters:
-    ///     - attributes: to draw this string with. Default is `nil`.
-    ///     - size: of the image to return.
-    /// - Returns: a `UIImage` instance from this string using a specified
-    /// attributes and size, or `nil` if the operation fails.
-    func image(withAttributes attributes: [NSAttributedString.Key: Any]? = nil, size: CGSize? = nil) -> UIImage? {
-        let size = size ?? (self as NSString).size(withAttributes: attributes)
-        return UIGraphicsImageRenderer(size: size).image { _ in
-            (self as NSString).draw(
-                in: CGRect(origin: .zero, size: size),
-                withAttributes: attributes
-            )
-        }
-    }
-
-    func isAlphanumeric() -> Bool {
-        rangeOfCharacter(from: CharacterSet.alphanumerics.inverted) == nil && !isEmpty
-    }
-
-    func isAlphanumeric(ignoreDiacritics: Bool = false) -> Bool {
-        if ignoreDiacritics {
-            range(of: "[^a-zA-Z0-9]", options: .regularExpression) == nil && !isEmpty
-        } else {
-            isAlphanumeric()
-        }
-    }
-
     var isBlank: Bool {
         trimmingCharacters(in: .whitespacesAndNewlines).isEmpty
     }

NativeAppTemplateTests/Extensions/StringExtensionsTest.swift

@@ -3,39 +3,10 @@
 //  NativeAppTemplate
 //
 
-import CoreGraphics
 @testable import NativeAppTemplate
 import Testing
 
 struct StringExtensionsTest {
-    @Test(arguments: [
-        ("hello123", true),
-        ("ABC", true),
-        ("abc", true),
-        ("123", true),
-        ("Hello World", false),
-        ("hello!", false),
-        ("hello@world", false),
-        ("", false)
-    ])
-    func isAlphanumeric(input: String, expected: Bool) {
-        #expect(input.isAlphanumeric() == expected)
-    }
-
-    @Test
-    func isAlphanumericIgnoringDiacritics() {
-        #expect("hello123".isAlphanumeric(ignoreDiacritics: true) == true)
-        #expect("ABC123".isAlphanumeric(ignoreDiacritics: true) == true)
-        #expect("hello world".isAlphanumeric(ignoreDiacritics: true) == false)
-        #expect("".isAlphanumeric(ignoreDiacritics: true) == false)
-    }
-
-    @Test
-    func imageGeneration() {
-        let image = "A".image(size: CGSize(width: 50, height: 50))
-        #expect(image != nil)
-    }
-
     @Test(arguments: [
         ("", true),
         ("   ", true),