Update settings/admin UI and misc fixes

README.md

@@ -56,6 +56,15 @@ The player keeps itself up-to-date automatically:
 
 This project includes a simple **forgot password** flow. SMTP configuration is read from environment variables.
 
+You can also configure SMTP settings from the UI: **Admin → Settings**.
+Environment variables still take precedence over the database settings.
+
+### Public domain for emails
+
+If your app runs behind a reverse proxy (or the internal hostname differs from the public hostname),
+set **Admin → Settings → Public domain** to e.g. `signage.example.com` so links in password reset
+emails point to the correct address.
+
 Recommended: put these in a local `.env` file in the repo root. Flask (via `python-dotenv`) will auto-load it on startup. `.env` is already gitignored.
 
 You can start from `.env.example`:
@@ -81,6 +90,11 @@ REM Option B: put the same keys/values in a .env file instead
 
 Security note: do **not** commit SMTP passwords to the repo. Prefer secrets management and rotate leaked credentials.
 
+Note on the "From" address: some SMTP providers enforce that the authenticated mailbox
+(`SMTP_USERNAME`) is used as the actual sender (envelope-from), even if a different
+`SMTP_FROM` is provided. In that case the app sets a `Reply-To` header so replies still
+go to `SMTP_FROM`, but the provider may still show the username address as the sender.
+
 ### Troubleshooting mail delivery
 
 If the reset email is not received:
@@ -104,3 +118,6 @@ If the reset email is not received:
 
 
 
+
+
+