Implement developer feature to avoid distractions

This commit implements an optional developer feature to scramble text
and blur images to prevent distractions during development and testing.

It is not perfect (It breaks some mentions and rich text objects, and
does not scramble non-alphanumeric languages such as Japanese), but
good enough to avoid distractions while working on most features.

No changelog entry is needed because this is not meant for the final
user.

Changelog-None
Signed-off-by: Daniel D’Aquino <daniel@daquino.me>

damus/Util/Undistractor.swift

@@ -0,0 +1,30 @@
+//
+//  Undistractor.swift
+//  damus
+//
+//  Created by Daniel D’Aquino on 2025-02-19.
+//
+
+/// Keeping the minds of developers safe from the occupational hazard of social media distractions when testing Damus since 2025
+struct Undistractor {
+    static func makeGibberish(text: String) -> String {
+        let lowercaseLetters = "abcdefghijklmnopqrstuvwxyz"
+        let uppercaseLetters = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+        var transformedText = ""
+
+        for char in text {
+            if lowercaseLetters.contains(char) {
+                if let randomLetter = lowercaseLetters.randomElement() {
+                    transformedText.append(randomLetter)
+                }
+            } else if uppercaseLetters.contains(char) {
+                if let randomLetter = uppercaseLetters.randomElement() {
+                    transformedText.append(randomLetter)
+                }
+            } else {
+                transformedText.append(char)
+            }
+        }
+        return transformedText
+    }
+}