fix(#298): internationalize ConnectViewModel strings, fix null-assert crash on profile selector (#307)

* fix(#298): internationalize ConnectViewModel strings, fix null-assert crash on profile selector

E1: Add all connect error resources to strings.xml for i18n readiness
E2: Migrate ConnectViewModel to AndroidViewModel, replace all hardcoded
    user-facing strings with getString(R.string.*) calls
F1: Replace state.selectedProfile!! with .?.let { } pattern in
    ConnectScreen.kt to eliminate NPE risk on mutable state copy

Closes #298

* fix(#298): update test files for AndroidViewModel constructor

Update ConnectViewModelTest.kt and E2eIntegrationTest.kt to pass
mock Application to the new ConnectViewModel(app) constructor.
Add getString() MockK stubs matching the string resource keys.

* fix(#298): add missing LocalContext import and restore connect_pairing_string

Two compilation errors:
- ConnectScreen.kt was missing import for LocalContext
- strings.xml was missing connect_pairing_string resource
  (accidentally removed in earlier patch)

* fix(#298): extract ViewModelFactory to avoid composable-in-non-composable error

LocalContext.current cannot be called inside a viewModel { } factory
lambda because the lambda is not @Composable. Fix by extracting a
ConnectViewModelFactory class and using run { } to capture the
Application value at the composable call site before passing to
the factory constructor.

* fix(#298): fix MockK varargs matching in test stubs

getString(int, Object...) takes varargs. MockK's any<Int>() and
any<String>() didn't match the vararg Object... slot. Changed to
any() (untyped) which matches correctly.

* fix(#298): fix MockK answers — arg indexing was wrong

In getString(int, Object...), firstArg is the resource ID,
secondArg is the format argument. Using firstArg<Int>() in
the answers block was returning the res ID, not 500/etc.
Changed to secondArg<Any>().

* fix(#298): replace getString(int,Object...) with String.format(getString(int),...)

Avoid MockK varargs matching issues by calling app.getString(int)
for the format template and String.format() to apply args.
Simplifies test stubs to pure getString(int) returns.

---------

Co-authored-by: M57 <hy4ri@users.noreply.github.com>

app/src/test/java/com/m57/hermescontrol/E2eIntegrationTest.kt

@@ -1,5 +1,6 @@
 package com.m57.hermescontrol
 
+import android.app.Application
 import androidx.navigation3.runtime.NavBackStack
 import androidx.navigation3.runtime.NavKey
 import com.m57.hermescontrol.data.local.AuthManager
@@ -56,6 +57,7 @@ import java.io.IOException
 class E2eIntegrationTest {
     private val testDispatcher = StandardTestDispatcher()
     private lateinit var mockApiService: HermesApiService
+    private val mockApp = mockk<Application>(relaxed = true)
 
     @Before
     fun setUp() {
@@ -85,6 +87,9 @@ class E2eIntegrationTest {
         every { AuthManager.getProfileToken(any()) } returns null
         every { AuthManager.setProfileToken(any(), any()) } returns Unit
         every { AuthManager.saveConnectionProfiles(any()) } returns Unit
+
+        // Application stubs
+        every { mockApp.getString(R.string.connect_error_401) } returns "Invalid token (401 Unauthorized)"
     }
 
     @After
@@ -760,7 +765,7 @@ class E2eIntegrationTest {
             val mockResponse = createErrorResponse<StatusResponse>(401)
             coEvery { mockApiService.getStatus() } returns mockResponse
 
-            val viewModel = ConnectViewModel()
+            val viewModel = ConnectViewModel(mockApp)
             viewModel.onTokenChange("expired-token")
             viewModel.connect()
             advanceUntilIdle()
@@ -781,7 +786,7 @@ class E2eIntegrationTest {
             val statusResponse = mockk<StatusResponse>()
             coEvery { mockApiService.getStatus() } returns Response.success(statusResponse)
 
-            val connectViewModel = ConnectViewModel()
+            val connectViewModel = ConnectViewModel(mockApp)
             connectViewModel.onTokenChange("valid-token")
             connectViewModel.onHostChange("127.0.0.1")
             connectViewModel.onPortChange("9119")
@@ -1069,7 +1074,7 @@ class E2eIntegrationTest {
             val statusResponse = mockk<StatusResponse>()
             coEvery { mockApiService.getStatus() } returns Response.success(statusResponse)
 
-            val viewModel = ConnectViewModel()
+            val viewModel = ConnectViewModel(mockApp)
             viewModel.onPairingString("hermes://connect?host=192.168.1.5&port=9119&token=TEST_TOKEN")
             advanceUntilIdle()
 
@@ -1095,7 +1100,7 @@ class E2eIntegrationTest {
             val statusResponse = mockk<StatusResponse>()
             coEvery { mockApiService.getStatus() } returns Response.success(statusResponse)
 
-            val viewModel = ConnectViewModel()
+            val viewModel = ConnectViewModel(mockApp)
             viewModel.onPairingString(base64Str)
             advanceUntilIdle()