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/ui/settings/SettingsViewModel.kt

@@ -4,6 +4,7 @@ import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
 import com.m57.hermescontrol.ScreenRegistry
 import com.m57.hermescontrol.data.config.ConnectionProfile
+import com.m57.hermescontrol.data.config.resolveBaseUrl
 import com.m57.hermescontrol.data.local.AuthManager
 import com.m57.hermescontrol.data.remote.ApiClient
 import com.m57.hermescontrol.data.remote.CleartextPolicy
@@ -170,7 +171,7 @@ class SettingsViewModel(
                 showProfileDialog = true,
                 editingProfileId = profileId,
                 dialogProfileName = profile.name,
-                dialogProfileBaseUrl = profile.resolvedBaseUrl,
+                dialogProfileBaseUrl = profile.resolveBaseUrl(AuthManager.getBaseUrl()),
                 dialogProfileToken = token,
                 dialogProfileError = null,
             )

app/src/main/java/com/m57/hermescontrol/ui/settings/components/ConnectionSection.kt

@@ -35,6 +35,7 @@ import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.unit.dp
 import androidx.lifecycle.viewmodel.compose.viewModel
 import com.m57.hermescontrol.R
+import com.m57.hermescontrol.data.config.resolveBaseUrl
 import com.m57.hermescontrol.ui.settings.SectionCard
 import com.m57.hermescontrol.ui.settings.SettingsUiState
 import com.m57.hermescontrol.ui.settings.SettingsViewModel
@@ -85,7 +86,7 @@ internal fun ConnectionSection(
                                 style = MaterialTheme.typography.bodyMedium.copy(fontWeight = FontWeight.Medium),
                             )
                             Text(
-                                text = profile.resolvedBaseUrl,
+                                text = profile.resolveBaseUrl(state.baseUrl),
                                 style =
                                     MaterialTheme.typography.bodySmall.copy(
                                         color = MaterialTheme.colorScheme.onSurfaceVariant,