fix(#478): rework default login to use unified ConnectionProfile model (#482)

* fix(#478): rework default login to use unified ConnectionProfile model

- AuthManager: drop legacy auth_token path; getToken/setToken now delegate
  to the selected profile (profile token only, no global fallback)
- setHost/setPort always write the selected profile (no top-level host/port branch)
- Add DEFAULT_PROFILE_ID + ensureDefaultProfile()/ensureDefaultSelected() so the
  selected profile is never null; ensureDefaultSelected() only falls back when
  nothing is selected (never clobbers an existing choice); ensureDefaultProfile()
  only injects a Default profile on fresh install, never into an existing list
- One-time migration folds legacy standalone auth_token into the Default profile,
  batched into a single SharedPreferences transaction (guarded by legacy_default_migrated)
- ConnectViewModel.connect() persists via setToken/setHost/setPort (delegate to
  the selected profile) — keeps the existing persistence contract
- Connect/Settings: remove the '(none)'/standalone profile option; deleteProfile
  falls back to Default profile instead of null selection
- Update AuthManagerTest/ConnectViewModelTest to the unified model; fix test
  stub ordering + migration re-init; remove dead connect_profile_none / settings_profile_none strings

Closes #478

* fix: stub AuthManager.ensureDefaultSelected() in E2eIntegrationTest

The #478 ConnectViewModel.connect() success branch now calls
AuthManager.ensureDefaultSelected() on the non-saveProfile path.
E2eIntegrationTest.setUp() mocks AuthManager as a non-relaxed mockkObject
but never stubs that method, so the unstubbed call throws MockKException inside
viewModelScope.launch, leaving connectionSuccess unset and failing 3 tests:
- testFullUserSessionFlow
- testConnectViewModel_onPairingString_base64Format
- testConnectViewModel_onPairingString_urlFormat

Add the missing stub. Verified locally: full suite 322/322 passing.

---------

Co-authored-by: ronia <ronia@m57>

app/src/test/java/com/m57/hermescontrol/ui/settings/SettingsViewModelTest.kt

@@ -18,7 +18,6 @@ import kotlinx.coroutines.test.setMain
 import org.junit.After
 import org.junit.Assert.assertEquals
 import org.junit.Assert.assertFalse
-import org.junit.Assert.assertNull
 import org.junit.Before
 import org.junit.Test
 
@@ -133,18 +132,18 @@ class SettingsViewModelTest {
     }
 
     @Test
-    fun testSelectProfile_nullClearsSelection() {
+    fun testSelectProfile_nullFallsBackToDefault() {
         every { AuthManager.getConnectionProfiles() } returns testProfiles
         storedSelectedProfileId = "prof-1"
 
         val viewModel = createViewModel()
 
-        viewModel.selectProfile(null)
+        viewModel.selectProfile(AuthManager.DEFAULT_PROFILE_ID)
         testDispatcher.scheduler.advanceUntilIdle()
 
-        verify { AuthManager.setSelectedProfileId(null) }
+        verify { AuthManager.setSelectedProfileId(AuthManager.DEFAULT_PROFILE_ID) }
         verify { ApiClient.rebuild() }
-        assertNull(viewModel.uiState.value.selectedProfileId)
+        assertEquals(AuthManager.DEFAULT_PROFILE_ID, viewModel.uiState.value.selectedProfileId)
     }
 
     @Test
@@ -199,12 +198,12 @@ class SettingsViewModelTest {
 
         verify { AuthManager.saveConnectionProfiles(any()) }
         verify { AuthManager.setProfileToken("prof-1", null) }
-        verify { AuthManager.setSelectedProfileId(null) }
+        verify { AuthManager.setSelectedProfileId(AuthManager.DEFAULT_PROFILE_ID) }
         verify { ApiClient.rebuild() }
     }
 
     @Test
-    fun testDeleteProfile_nonSelected_doesNotClearSelectedId() {
+    fun testDeleteProfile_nonSelected_doesNotChangeSelectedId() {
         every { AuthManager.getConnectionProfiles() } returns testProfiles
         every { AuthManager.getSelectedProfileId() } returns "prof-1"
 
@@ -214,8 +213,8 @@ class SettingsViewModelTest {
 
         verify { AuthManager.saveConnectionProfiles(any()) }
         verify { AuthManager.setProfileToken("prof-2", null) }
-        // Selected profile (prof-1) was NOT deleted — should NOT clear selection
-        verify(exactly = 0) { AuthManager.setSelectedProfileId(null) }
+        // Selected profile (prof-1) was NOT deleted — should NOT change selection
+        verify(exactly = 0) { AuthManager.setSelectedProfileId(any()) }
         verify { ApiClient.rebuild() }
     }