Add option to require server login for user profile (#1367)

## Description
This PR adds a new method of protecting a user profile when switching to
it: server login. When enabled, switching to the user requires
authenticating with the server again via Quick Connect or username &
password. This is basically the same as the official client.

### Related issues
Closes #321
Related to #1330 - might cause merge conflicts
Related to #1287 - definitely causes merge conflicts

### Testing
Emulator with various uses cases including auto sign-in, switching
between server login & PIN protection, and removing the protection

## Screenshots
N/A, the login looks identical as adding a new user

## AI or LLM usage
None

app/src/main/java/com/github/damontecres/wholphin/preferences/AppPreference.kt

@@ -914,9 +914,9 @@ sealed interface AppPreference<Pref, T> {
                 summaryOff = R.string.disabled,
             )
 
-        val RequireProfilePin =
+        val ProtectProfilePreference =
             AppClickablePreference<AppPreferences>(
-                title = R.string.require_pin_code,
+                title = R.string.profile_protection,
             )
 
         val ImageDiskCacheSize =
@@ -1088,7 +1088,7 @@ val basicPreferences =
             title = R.string.profile_specific_settings,
             preferences =
                 listOf(
-                    AppPreference.RequireProfilePin,
+                    AppPreference.ProtectProfilePreference,
                     AppPreference.CustomizeHome,
                     AppPreference.UserPinnedNavDrawerItems,
                 ),