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/connect/ConnectViewModelTest.kt

@@ -410,21 +410,6 @@ class ConnectViewModelTest {
         verify { AuthManager.setSelectedProfileId("test-id") }
     }
 
-    @Test
-    fun testSelectProfile_null_clearsState() {
-        val viewModel = ConnectViewModel(mockApp)
-        viewModel.selectProfile(null)
-
-        val state = viewModel.uiState.value
-        assertEquals("", state.profileName)
-        assertEquals("127.0.0.1", state.host)
-        assertEquals("9119", state.port)
-        assertEquals("", state.token)
-        assertNull(state.selectedProfile)
-
-        verify { AuthManager.setSelectedProfileId(null) }
-    }
-
     @Test
     fun testConnect_saveProfile_savesAndSelects() =
         runTest {
@@ -525,7 +510,7 @@ class ConnectViewModelTest {
     }
 
     @Test
-    fun testConnect_withoutSaveProfile_clearsSelectedProfile() =
+    fun testConnect_withoutSaveProfile_persistsToDefaultProfile() =
         runTest {
             val viewModel = ConnectViewModel(mockApp)
             viewModel.onTokenChange("standalone-token")
@@ -548,9 +533,9 @@ class ConnectViewModelTest {
             viewModel.connect()
             advanceUntilIdle()
 
-            verify { AuthManager.setSelectedProfileId(null) }
             verify { AuthManager.setToken("standalone-token") }
             verify { AuthManager.setHost("10.0.0.1") }
+            verify { AuthManager.setPort(9119) }
             verify(exactly = 0) { AuthManager.saveConnectionProfiles(any()) }
         }