feat: add open-in-browser button to dashboard

Opens {baseUrl}/{siteId} in the default browser so users can quickly
access the full Plausible web interface for their site.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

app/src/main/java/no/naiv/implausibly/ui/dashboard/DashboardScreen.kt

@@ -7,8 +7,11 @@ import androidx.compose.foundation.layout.Spacer
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.height
 import androidx.compose.foundation.lazy.LazyColumn
+import android.content.Intent
+import android.net.Uri
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.Language
+import androidx.compose.material.icons.filled.OpenInBrowser
 import androidx.compose.material.icons.filled.SwapHoriz
 import androidx.compose.material3.ExperimentalMaterial3Api
 import androidx.compose.material3.Icon
@@ -21,6 +24,7 @@ import androidx.compose.runtime.Composable
 import androidx.compose.runtime.collectAsState
 import androidx.compose.runtime.getValue
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.unit.dp
 import androidx.hilt.navigation.compose.hiltViewModel
 import no.naiv.implausibly.domain.model.DashboardData
@@ -47,12 +51,21 @@ fun DashboardScreen(
     viewModel: DashboardViewModel = hiltViewModel()
 ) {
     val uiState by viewModel.uiState.collectAsState()
+    val context = LocalContext.current
 
     Scaffold(
         topBar = {
             TopAppBar(
                 title = { Text(uiState.siteId) },
                 actions = {
+                    if (uiState.baseUrl.isNotEmpty()) {
+                        IconButton(onClick = {
+                            val url = "${uiState.baseUrl}/${uiState.siteId}"
+                            context.startActivity(Intent(Intent.ACTION_VIEW, Uri.parse(url)))
+                        }) {
+                            Icon(Icons.Default.OpenInBrowser, contentDescription = "Open in browser")
+                        }
+                    }
                     IconButton(onClick = { onNavigateToSites(uiState.instanceId) }) {
                         Icon(Icons.Default.Language, contentDescription = "Switch site")
                     }

app/src/main/java/no/naiv/implausibly/ui/dashboard/DashboardViewModel.kt

@@ -21,6 +21,7 @@ import javax.inject.Inject
 data class DashboardUiState(
     val instanceId: String = "",
     val siteId: String = "",
+    val baseUrl: String = "",
     val dateRange: DateRange = DateRange.ThirtyDays,
     val dataState: UiState<DashboardData> = UiState.Loading,
     val isRefreshing: Boolean = false
@@ -76,6 +77,7 @@ class DashboardViewModel @Inject constructor(
 
                 _uiState.update {
                     it.copy(
+                        baseUrl = instance.baseUrl,
                         dataState = UiState.Success(data),
                         isRefreshing = false
                     )