Fix infinite spinner on guide screen and allow cleartext HTTP in debug

Two bugs combined to cause this: (1) Android blocks plain-HTTP traffic
by default since API 28, so every call to our HTTP-only local backend
was throwing and being silently swallowed; (2) GuideViewModel's
loadNearby() returned early on that exception without ever setting
isLoading = false, so the spinner never cleared and no error showed.

Fix: debug-only manifest override (src/debug/AndroidManifest.xml)
enables cleartext traffic for local dev against the Docker backend;
GuideViewModel now always resolves isLoading and surfaces a
errorMessage + retry() the UI can act on instead of hanging forever.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

android/app/src/debug/AndroidManifest.xml

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+    <!--
+      Debug builds only: allow plain-HTTP traffic so the app can talk to the
+      local Docker backend (http://<lan-ip>:8000) during development.
+      Android blocks cleartext traffic by default since API 28 — release
+      builds intentionally do NOT get this override.
+    -->
+    <application android:usesCleartextTraffic="true" />
+</manifest>

android/app/src/main/java/com/guidecity/app/ui/guide/GuideScreen.kt

@@ -1,13 +1,18 @@
 package com.guidecity.app.ui.guide
 
+import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Spacer
 import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.height
 import androidx.compose.foundation.layout.padding
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.Favorite
 import androidx.compose.material.icons.filled.Settings
 import androidx.compose.material.icons.filled.VolumeOff
 import androidx.compose.material.icons.filled.VolumeUp
+import androidx.compose.material3.Button
 import androidx.compose.material3.CircularProgressIndicator
 import androidx.compose.material3.Icon
 import androidx.compose.material3.IconButton
@@ -20,6 +25,7 @@ import androidx.compose.runtime.getValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.unit.dp
 import androidx.hilt.navigation.compose.hiltViewModel
 import com.guidecity.app.R
 
@@ -61,6 +67,22 @@ fun GuideScreen(
                 .padding(padding),
         ) {
             when {
+                state.errorMessage != null -> {
+                    Column(
+                        modifier = Modifier
+                            .fillMaxSize()
+                            .padding(24.dp),
+                        verticalArrangement = Arrangement.Center,
+                        horizontalAlignment = Alignment.CenterHorizontally,
+                    ) {
+                        Text(text = state.errorMessage.orEmpty())
+                        Spacer(modifier = Modifier.height(16.dp))
+                        Button(onClick = { viewModel.retry() }) {
+                            Text(text = stringResource(R.string.guide_retry))
+                        }
+                    }
+                }
+
                 state.isLoading -> {
                     Box(modifier = Modifier.fillMaxSize(), contentAlignment = Alignment.Center) {
                         CircularProgressIndicator()

android/app/src/main/java/com/guidecity/app/ui/guide/GuideViewModel.kt

@@ -26,6 +26,7 @@ data class GuideUiState(
     val activeIndex: Int = 0,
     val doneIndices: Set<Int> = emptySet(),
     val isMuted: Boolean = false,
+    val errorMessage: String? = null,
 )
 
 /**
@@ -73,11 +74,11 @@ class GuideViewModel @Inject constructor(
     private suspend fun loadNearby(startNarration: Boolean) {
         val location = selectedLocationHolder.location.value ?: locationProvider.getCurrentLocation()
         if (location == null) {
-            _uiState.value = _uiState.value.copy(isLoading = false)
+            _uiState.value = _uiState.value.copy(isLoading = false, errorMessage = "Location unavailable")
             return
         }
 
-        val response = runCatching {
+        runCatching {
             placesRepository.getNearby(
                 lat = location.lat,
                 lon = location.lon,
@@ -85,18 +86,31 @@ class GuideViewModel @Inject constructor(
                 lang = "ru",
                 length = contentLength.toApiValue(),
             )
-        }.getOrNull() ?: return
+        }.onSuccess { response ->
-
             _uiState.value = _uiState.value.copy(
                 isLoading = false,
                 places = response.places,
                 activeIndex = 0,
                 doneIndices = emptySet(),
+                errorMessage = null,
             )
-
             if (startNarration) {
                 narrateActive()
             }
+        }.onFailure { error ->
+            _uiState.value = _uiState.value.copy(
+                isLoading = false,
+                errorMessage = error.message ?: "Network error",
+            )
+        }
+    }
+
+    /** Retries after a failed load (e.g. tap a "retry" button shown on error). */
+    fun retry() {
+        viewModelScope.launch {
+            _uiState.value = _uiState.value.copy(isLoading = true, errorMessage = null)
+            loadNearby(startNarration = true)
+        }
     }
 
     private fun narrateActive() {

android/app/src/main/res/values-ru/strings.xml

@@ -17,6 +17,7 @@
     <string name="map_search_placeholder">Введите место для поиска…</string>
 
     <string name="guide_no_places_nearby">Поблизости пока не найдено интересных мест.</string>
+    <string name="guide_retry">Повторить</string>
     <string name="guide_favorite_add">Добавить в избранное</string>
     <string name="guide_favorite_remove">Убрать из избранного</string>
     <string name="guide_mute">Выключить озвучку</string>

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

@@ -17,6 +17,7 @@
     <string name="map_search_placeholder">Search for a place instead…</string>
 
     <string name="guide_no_places_nearby">No places found nearby yet.</string>
+    <string name="guide_retry">Retry</string>
     <string name="guide_favorite_add">Add to favorites</string>
     <string name="guide_favorite_remove">Remove from favorites</string>
     <string name="guide_mute">Mute narration</string>