Fix #647: resolve Default profile URL from top-level login URL (#649)

* Fix #647: resolve Default profile URL from top-level login URL

ConnectionProfile.resolvedBaseUrl (used directly by ConnectionSection for
the profile list display) silently fell back to the hardcoded loopback
127.0.0.1:9119 whenever a profile's own baseUrl was null, instead of using
the URL the user actually authenticated against.

- Add ConnectionProfile.resolveBaseUrl(topLevelBaseUrl) that prefers the
  profile's own baseUrl, then the top-level login URL, then legacy loopback.
- Store-level ServerCollectionOps.resolvedBaseUrl now applies the same
  fallback so a null-baseUrl profile still shows the real gateway.
- ConnectionSection, SettingsViewModel and ConnectViewModel resolve against
  AuthManager.getBaseUrl() so the loopback fallback can never surface.
- Add Issue647ProfileUrlTest covering login-stamp, null-baseUrl fallback,
  own-URL precedence, fresh-install loopback, and store-level resolution.
- Update existing AuthManagerTest assertions to the new property form.

* Fix #647 (root cause): cache login URL at top-level baseUrl

The previous change only made profile resolution prefer the top-level
login URL, but setBaseUrl() never actually wrote the top-level baseUrl
field — so it stayed DEFAULT_BASE_URL (https://127.0.0.1:9119/) forever.
A Default profile seeded with the loopback default (or whose own baseUrl
was never stamped) therefore still displayed the loopback URL after
logging in via a custom LAN address.

setBaseUrl() now also stamps the top-level baseUrl, making it the
authoritative "last successful login URL" cache. getBaseUrl() and the
store-level resolvedBaseUrl (profile-list display) now reflect the URL
actually authenticated against.

Add regression tests mirroring the exact AuthLoginViewModel.connect()
sequence (seed with loopback -> setBaseUrl(loginUrl) -> token) asserting
the Default profile, top-level baseUrl and store display all resolve to
the login URL, never loopback.

---------

Co-authored-by: M57 <Hy4ri@users.noreply.github.com>

app/src/main/java/com/m57/hermescontrol/data/local/AuthManager.kt

@@ -441,7 +441,16 @@ object AuthManager {
                         profile
                     }
                 }
-            state.copy(connectionProfiles = profiles)
+            // Also cache the login URL at the top level so that getBaseUrl() and
+            // the store-level resolvedBaseUrl (used by the profile list display)
+            // reflect the URL actually authenticated against, never the hardcoded
+            // loopback default. Fixes issue #647: a Default profile whose own
+            // baseUrl was never stamped must still resolve to this URL, not
+            // 127.0.0.1:9119.
+            state.copy(
+                baseUrl = normalized,
+                connectionProfiles = profiles,
+            )
         }
     }