Desktop Self-hosted guidance improvements (#5060)

Removed timeout when waiting for backend port to allow for slow backend
spinups



<img width="1185" height="951" alt="image"
src="https://github.com/user-attachments/assets/badaf8e5-611d-44aa-aca2-7c1c906c2019"
/>
<img width="1213" height="1533" alt="image"
src="https://github.com/user-attachments/assets/ce78b67a-07e0-4c23-9087-5de0c5f203c6"
/>
<img width="1207" height="1202" alt="image"
src="https://github.com/user-attachments/assets/c6e5b4c5-9cc3-4973-a634-3b7aa1e1dd34"
/>

frontend/public/locales/en-GB/translation.toml

@@ -5777,7 +5777,7 @@ description = "Sign in with your Stirling account"
 
 [setup.mode.selfhosted]
 title = "Self-Hosted Server"
-description = "Connect to your own Stirling PDF server"
+description = "Connect to your own Stirling PDF server with your personal account"
 
 [setup.saas]
 title = "Sign in to Stirling"
@@ -5813,6 +5813,13 @@ submit = "Login"
 signInWith = "Sign in with"
 oauthPending = "Opening browser for authentication..."
 orContinueWith = "Or continue with email"
+serverRequirement = "Note: The server must have login enabled."
+showInstructions = "How to enable?"
+hideInstructions = "Hide instructions"
+instructions = "To enable login on your Stirling PDF server:"
+instructionsEnvVar = "Set the environment variable:"
+instructionsOrYml = "Or in settings.yml:"
+instructionsRestart = "Then restart your server for the changes to take effect."
 
 [setup.login.username]
 label = "Username"