Docs: current password to change or remove the password

src/content/docs/docs/security.md

@@ -24,6 +24,7 @@ Run it on a trusted network, or behind a reverse proxy that terminates TLS and a
 - Sessions expire after an idle lifetime, 12 hours by default. A session in use is reissued past the halfway mark.
 - Login is rate-limited to 5 attempts per IP per 15 minutes. Counters are in memory, so a restart clears them and they are not shared across replicas. Run a single instance behind any proxy.
 - Changing the password rotates the session secret, signing out every other device. Sign out all devices does the same without changing the password.
+- Changing the password, or turning protection off, needs the current password as well as a session. Wrong attempts count toward the login limit of 5 per IP per 15 minutes.
 
 Authentication is only in force once a password is stored. Until then, the endpoint that sets one accepts the first caller. See [First setup](/docs/first-setup/).
 

src/content/docs/docs/settings-reference.md

@@ -38,7 +38,7 @@ If every app suddenly shows as unhealthy, the socket proxy address is the usual
 
 | Setting | What it does |
 | --- | --- |
-| Password Protection | Sets or changes the dashboard password. Between 8 and 1024 characters. Leave blank to keep the existing one. |
+| Password Protection | Sets or changes the dashboard password. Between 8 and 1024 characters. Leave blank to keep the existing one. Changing the password, or turning protection off, asks for the current password. |
 | Sign out all devices | Ends every session everywhere, including the one you are using. Use it if you think a session may be compromised. |
 
 Locked out? See [password recovery](/docs/troubleshooting/#i-forgot-the-password-and-i-am-locked-out).

src/content/docs/docs/troubleshooting.md

@@ -228,6 +228,9 @@ Messages shown in the admin, and what each one means.
 | Message | Meaning |
 | --- | --- |
 | `Could not connect to dashboard API` | The UI loaded but the API did not answer. See [above](#could-not-connect-to-dashboard-api). |
+| `The current password is incorrect.` | The current password typed to change or remove the password did not match. Nothing was saved. |
+| `The password was changed elsewhere. Reload the page and try again.` | The password changed on another device while this save ran. Nothing was saved. |
+| `Too many attempts. Try again later.` | 5 wrong passwords from this IP in 15 minutes. Wait, then try again. See [above](#one-persons-failed-logins-lock-everyone-out). |
 | `Enter the credential again for: ...` | The request a secret belonged to changed, so the secret was cleared. Re-enter and save. |
 | `Nothing at that address answered.` | The socket proxy address is unreachable from inside the container. Usually a proxy published on the host's loopback. |
 | `That name is resolved by Docker, which answers only for containers on a shared network.` | The socket proxy service name is not on a network Stackyard shares. |