Remove the "Sign in with Google" account-setup option

Gmail's restricted https://mail.google.com/ scope needs a paid CASA assessment to ship a
public release, so a dedicated Google OAuth button is a dead end. Drop it from the setup
screen — Gmail is still reachable via "Other (IMAP/SMTP)" with an app password.

- Removes the Google button and its now-unused launcher, coroutine scope, imports, and
  strings. The setup screen now offers Microsoft and Other (IMAP/SMTP).
- The underlying Gmail OAuth plumbing (GmailAuthManager, addGmailAccount, the ViewModel's
  Gmail methods) is left intact but unexposed; it can be ripped out entirely or re-surfaced
  later. assemble/lint/test green; verified on the emulator.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

app/src/main/kotlin/org/libremail/ui/accountsetup/AccountSetupScreen.kt

@@ -32,7 +32,6 @@ import androidx.compose.runtime.Composable
 import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.remember
-import androidx.compose.runtime.rememberCoroutineScope
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.res.stringResource
@@ -40,7 +39,6 @@ import androidx.compose.ui.text.style.TextAlign
 import androidx.compose.ui.unit.dp
 import androidx.hilt.navigation.compose.hiltViewModel
 import androidx.lifecycle.compose.collectAsStateWithLifecycle
-import kotlinx.coroutines.launch
 import org.libremail.R
 
 @OptIn(ExperimentalMaterial3Api::class)
@@ -53,12 +51,6 @@ fun AccountSetupScreen(
 ) {
     val state by viewModel.state.collectAsStateWithLifecycle()
     val snackbarHostState = remember { SnackbarHostState() }
-    val scope = rememberCoroutineScope()
-    val needsClientId = stringResource(R.string.account_gmail_needs_client_id)
-
-    val launcher = rememberLauncherForActivityResult(
-        ActivityResultContracts.StartActivityForResult(),
-    ) { result -> viewModel.onGmailResult(result.data) }
 
     val outlookLauncher = rememberLauncherForActivityResult(
         ActivityResultContracts.StartActivityForResult(),
@@ -108,20 +100,6 @@ fun AccountSetupScreen(
                     textAlign = TextAlign.Center,
                 )
                 Spacer(Modifier.height(24.dp))
-                Button(
-                    onClick = {
-                        if (viewModel.isGmailConfigured) {
-                            launcher.launch(viewModel.gmailAuthIntent())
-                        } else {
-                            scope.launch { snackbarHostState.showSnackbar(needsClientId) }
-                        }
-                    },
-                    enabled = !busy,
-                    modifier = Modifier.fillMaxWidth(),
-                ) {
-                    Text(stringResource(R.string.account_setup_gmail))
-                }
-                Spacer(Modifier.height(12.dp))
                 Button(
                     onClick = { outlookLauncher.launch(viewModel.outlookAuthIntent()) },
                     enabled = !busy,

app/src/main/res/values/strings.xml

@@ -67,11 +67,9 @@
     <string name="attachment_no_app">No app can open this file</string>
 
     <!-- Account setup -->
-    <string name="account_setup_gmail">Sign in with Google</string>
     <string name="account_setup_outlook">Sign in with Microsoft</string>
     <string name="account_setup_other">Other (IMAP/SMTP)</string>
     <string name="account_setup_subtitle">Choose how you want to connect your mailbox.</string>
-    <string name="account_gmail_needs_client_id">Add your Google OAuth client ID first — see the README</string>
 
     <!-- Manual IMAP/SMTP setup -->
     <string name="manual_setup_title">IMAP / SMTP</string>