Fix update notification: add banner UI + reset rate limit on version change

app/src/main/java/com/ledga/app/ui/home/HomeScreen.kt

@@ -38,6 +38,7 @@ import com.ledga.app.ui.components.TransactionCard
 import com.ledga.app.ui.components.categoryIcon
 import com.ledga.app.ui.components.parseColor
 import com.ledga.app.ui.theme.MpesaGreen
+import com.ledga.app.ui.theme.MpesaGreenDark
 import com.ledga.app.util.CurrencyFormatter
 
 @Composable
@@ -52,9 +53,46 @@ fun HomeScreen(
             .padding(horizontal = 16.dp),
         verticalArrangement = Arrangement.spacedBy(16.dp)
     ) {
+        // Update banner
+        if (state.updateAvailable != null) {
+            item {
+                Spacer(modifier = Modifier.height(12.dp))
+                Card(
+                    modifier = Modifier.fillMaxWidth(),
+                    shape = RoundedCornerShape(16.dp),
+                    colors = CardDefaults.cardColors(
+                        containerColor = MpesaGreenDark
+                    )
+                ) {
+                    Row(
+                        modifier = Modifier
+                            .fillMaxWidth()
+                            .padding(16.dp),
+                        verticalAlignment = Alignment.CenterVertically
+                    ) {
+                        Column(modifier = Modifier.weight(1f)) {
+                            Text(
+                                text = "Update Available",
+                                style = MaterialTheme.typography.titleSmall,
+                                fontWeight = FontWeight.Bold,
+                                color = androidx.compose.ui.graphics.Color.White
+                            )
+                            Text(
+                                text = "Version ${state.updateAvailable!!.tag_name}",
+                                style = MaterialTheme.typography.bodySmall,
+                                color = androidx.compose.ui.graphics.Color.White.copy(alpha = 0.8f)
+                            )
+                        }
+                    }
+                }
+            }
+        }
+
         // Greeting
         item {
-            Spacer(modifier = Modifier.height(12.dp))
+            if (state.updateAvailable == null) {
+                Spacer(modifier = Modifier.height(12.dp))
+            }
             Text(
                 text = state.greeting,
                 style = MaterialTheme.typography.headlineMedium,

app/src/main/java/com/ledga/app/ui/home/HomeViewModel.kt

@@ -128,6 +128,8 @@ class HomeViewModel @Inject constructor(
             donutSegments = segments,
             categoryBreakdown = breakdown
         )
+    }.combine(_updateAvailable) { state, update ->
+        state.copy(updateAvailable = update)
     }.stateIn(viewModelScope, SharingStarted.WhileSubscribed(5000), HomeUiState())
 
     fun selectPeriod(period: Period) {

app/src/main/java/com/ledga/app/worker/UpdateCheckWorker.kt

@@ -47,6 +47,7 @@ object UpdateChecker {
     private val json = Json { ignoreUnknownKeys = true }
     private const val PREFS_NAME = "update_prefs"
     private const val LAST_CHECK_KEY = "last_check"
+    private const val LAST_VERSION_KEY = "last_version"
 
     suspend fun checkForUpdate(
         context: Context,
@@ -54,11 +55,21 @@ object UpdateChecker {
         repo: String,
         currentVersion: String
     ): GitHubRelease? = withContext(Dispatchers.IO) {
-        // Rate limit: max once per day
         val prefs = context.getSharedPreferences(PREFS_NAME, Context.MODE_PRIVATE)
         val lastCheck = prefs.getLong(LAST_CHECK_KEY, 0)
+        val lastVersion = prefs.getString(LAST_VERSION_KEY, "") ?: ""
         val oneDayMs = 24 * 60 * 60 * 1000L
-        if (System.currentTimeMillis() - lastCheck < oneDayMs) return@withContext null
+
+        // Reset rate limit if app version changed (just updated)
+        val versionChanged = lastVersion != currentVersion
+        if (versionChanged) {
+            prefs.edit().putString(LAST_VERSION_KEY, currentVersion).apply()
+        }
+
+        // Rate limit: max once per day (skip if version just changed)
+        if (!versionChanged && System.currentTimeMillis() - lastCheck < oneDayMs) {
+            return@withContext null
+        }
 
         prefs.edit().putLong(LAST_CHECK_KEY, System.currentTimeMillis()).apply()