Straw phase G: recent watches + search history (SharedPreferences-lite)

New: HistoryStore — JSON-encoded SharedPreferences for two lists. Watches
keyed by videoId (max 50, FIFO), searches deduped case-insensitively (max
20). Surfaced as StateFlow so screens recompose live.

Wiring:
- StrawApp.onCreate: History.init(this)
- VideoDetailViewModel.load: recordWatch after StreamInfo resolves
- SearchViewModel.submit: recordSearch on each query

UI:
- StrawHome: redesigned. Tight inline header, full-width Search button,
  "Recently watched" LazyColumn below. Tap a recent row → VideoDetail.
- SearchScreen: when query is blank, show recent searches as
  AssistChip row. Tap a chip → onQueryChange + submit (instant search).

Day-4 graduates to Room when there's a real query pattern that SP can't
serve (date ranges, full-text search). For now the JSON-blob approach
ships in 30 minutes vs an hour of Room+KSP plumbing.

strawApp/src/main/kotlin/com/sulkta/straw/StrawActivity.kt

@@ -57,6 +57,9 @@ class StrawActivity : ComponentActivity() {
                     when (val s = nav.current) {
                         is Screen.Home -> StrawHome(
                             onOpenSearch = { nav.push(Screen.Search) },
+                            onOpenVideo = { url, title ->
+                                nav.push(Screen.VideoDetail(url, title))
+                            },
                         )
                         is Screen.Search -> SearchScreen(
                             onOpenVideo = { url, title ->

strawApp/src/main/kotlin/com/sulkta/straw/StrawApp.kt

@@ -6,6 +6,7 @@
 package com.sulkta.straw
 
 import android.app.Application
+import com.sulkta.straw.data.History
 import com.sulkta.straw.extractor.NewPipeDownloader
 import org.schabi.newpipe.extractor.NewPipe
 import org.schabi.newpipe.extractor.localization.ContentCountry
@@ -19,5 +20,6 @@ class StrawApp : Application() {
             Localization("en", "US"),
             ContentCountry("US"),
         )
+        History.init(this)
     }
 }

strawApp/src/main/kotlin/com/sulkta/straw/StrawHome.kt

@@ -5,43 +5,127 @@
 
 package com.sulkta.straw
 
+import androidx.compose.foundation.clickable
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.Spacer
 import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.height
 import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.layout.width
+import androidx.compose.foundation.lazy.LazyColumn
+import androidx.compose.foundation.lazy.items
+import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.material3.Button
+import androidx.compose.material3.HorizontalDivider
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.collectAsState
+import androidx.compose.runtime.getValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.clip
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.unit.dp
+import coil3.compose.AsyncImage
+import com.sulkta.straw.data.History
+import com.sulkta.straw.data.WatchHistoryItem
 
 @Composable
-fun StrawHome(onOpenSearch: () -> Unit) {
+fun StrawHome(
+    onOpenSearch: () -> Unit,
+    onOpenVideo: (url: String, title: String) -> Unit,
+) {
+    val watches by History.get().watches.collectAsState()
+
     Column(
-        modifier = Modifier
-            .fillMaxSize()
-            .padding(24.dp),
-        verticalArrangement = Arrangement.Center,
-        horizontalAlignment = Alignment.CenterHorizontally,
+        modifier = Modifier.fillMaxSize().padding(horizontal = 20.dp, vertical = 12.dp),
     ) {
-        Text(
-            text = "straw",
-            style = MaterialTheme.typography.displayLarge,
-            color = MaterialTheme.colorScheme.primary,
-        )
+        // Header
         Spacer(modifier = Modifier.height(8.dp))
-        Text(
-            text = "v0.1.0 — Sulkta-Coop",
-            style = MaterialTheme.typography.bodyMedium,
-            color = MaterialTheme.colorScheme.onSurfaceVariant,
-        )
-        Spacer(modifier = Modifier.height(48.dp))
-        Button(onClick = onOpenSearch) {
-            Text("Search YouTube")
+        Row(verticalAlignment = Alignment.CenterVertically) {
+            Text(
+                text = "straw",
+                style = MaterialTheme.typography.displayMedium,
+                color = MaterialTheme.colorScheme.primary,
+            )
+            Spacer(modifier = Modifier.width(12.dp))
+            Text(
+                text = "v0.1.0",
+                style = MaterialTheme.typography.labelSmall,
+                color = MaterialTheme.colorScheme.onSurfaceVariant,
+            )
+        }
+        Spacer(modifier = Modifier.height(16.dp))
+        Button(
+            onClick = onOpenSearch,
+            modifier = Modifier.fillMaxWidth(),
+        ) { Text("Search YouTube") }
+
+        Spacer(modifier = Modifier.height(20.dp))
+
+        if (watches.isEmpty()) {
+            Text(
+                text = "Recently watched videos appear here.",
+                style = MaterialTheme.typography.bodyMedium,
+                color = MaterialTheme.colorScheme.onSurfaceVariant,
+            )
+        } else {
+            Text(
+                text = "Recently watched",
+                style = MaterialTheme.typography.titleMedium,
+                fontWeight = FontWeight.SemiBold,
+            )
+            Spacer(modifier = Modifier.height(8.dp))
+            LazyColumn {
+                items(watches) { w ->
+                    RecentRow(w) { onOpenVideo(w.url, w.title) }
+                    HorizontalDivider()
+                }
+            }
+        }
+    }
+}
+
+@Composable
+private fun RecentRow(item: WatchHistoryItem, onClick: () -> Unit) {
+    Row(
+        modifier = Modifier
+            .fillMaxWidth()
+            .clickable(onClick = onClick)
+            .padding(vertical = 8.dp),
+        verticalAlignment = Alignment.CenterVertically,
+    ) {
+        AsyncImage(
+            model = item.thumbnail,
+            contentDescription = null,
+            modifier = Modifier
+                .width(120.dp)
+                .height(68.dp)
+                .clip(RoundedCornerShape(6.dp)),
+        )
+        Spacer(modifier = Modifier.width(12.dp))
+        Column(modifier = Modifier.weight(1f)) {
+            Text(
+                text = item.title,
+                style = MaterialTheme.typography.bodyMedium,
+                fontWeight = FontWeight.SemiBold,
+                maxLines = 2,
+                overflow = TextOverflow.Ellipsis,
+            )
+            Spacer(modifier = Modifier.height(2.dp))
+            Text(
+                text = item.uploader,
+                style = MaterialTheme.typography.bodySmall,
+                color = MaterialTheme.colorScheme.onSurfaceVariant,
+                maxLines = 1,
+                overflow = TextOverflow.Ellipsis,
+            )
         }
     }
 }

strawApp/src/main/kotlin/com/sulkta/straw/data/HistoryStore.kt

@@ -0,0 +1,98 @@
+/*
+ * SPDX-FileCopyrightText: 2026 Sulkta-Coop
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ *
+ * SharedPreferences-backed recent watches + recent search store. Day-3.
+ * Day-4 graduates to Room when there's a real query pattern (date ranges,
+ * full-text search, etc.) that SharedPreferences can't serve.
+ */
+
+package com.sulkta.straw.data
+
+import android.content.Context
+import android.content.SharedPreferences
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.asStateFlow
+import kotlinx.serialization.Serializable
+import kotlinx.serialization.json.Json
+
+@Serializable
+data class WatchHistoryItem(
+    val url: String,
+    val videoId: String,
+    val title: String,
+    val uploader: String,
+    val thumbnail: String?,
+    val watchedAt: Long,
+)
+
+private const val PREFS = "straw_history"
+private const val KEY_WATCHES = "watches_v1"
+private const val KEY_SEARCHES = "searches_v1"
+private const val MAX_WATCHES = 50
+private const val MAX_SEARCHES = 20
+
+class HistoryStore(context: Context) {
+    private val sp: SharedPreferences = context.getSharedPreferences(PREFS, Context.MODE_PRIVATE)
+    private val json = Json { ignoreUnknownKeys = true; isLenient = true }
+
+    private val _watches = MutableStateFlow(loadWatches())
+    val watches: StateFlow<List<WatchHistoryItem>> = _watches.asStateFlow()
+
+    private val _searches = MutableStateFlow(loadSearches())
+    val searches: StateFlow<List<String>> = _searches.asStateFlow()
+
+    fun recordWatch(item: WatchHistoryItem) {
+        val now = item.copy(watchedAt = System.currentTimeMillis())
+        val without = _watches.value.filterNot { it.videoId == item.videoId }
+        val next = (listOf(now) + without).take(MAX_WATCHES)
+        _watches.value = next
+        sp.edit().putString(KEY_WATCHES, json.encodeToString(next)).apply()
+    }
+
+    fun recordSearch(query: String) {
+        val q = query.trim()
+        if (q.isEmpty()) return
+        val without = _searches.value.filterNot { it.equals(q, ignoreCase = true) }
+        val next = (listOf(q) + without).take(MAX_SEARCHES)
+        _searches.value = next
+        sp.edit().putString(KEY_SEARCHES, json.encodeToString(next)).apply()
+    }
+
+    fun clearWatches() {
+        _watches.value = emptyList()
+        sp.edit().remove(KEY_WATCHES).apply()
+    }
+
+    fun clearSearches() {
+        _searches.value = emptyList()
+        sp.edit().remove(KEY_SEARCHES).apply()
+    }
+
+    private fun loadWatches(): List<WatchHistoryItem> = runCatching {
+        val s = sp.getString(KEY_WATCHES, null) ?: return emptyList()
+        json.decodeFromString<List<WatchHistoryItem>>(s)
+    }.getOrDefault(emptyList())
+
+    private fun loadSearches(): List<String> = runCatching {
+        val s = sp.getString(KEY_SEARCHES, null) ?: return emptyList()
+        json.decodeFromString<List<String>>(s)
+    }.getOrDefault(emptyList())
+}
+
+/** App-wide singleton; created in StrawApp.onCreate. */
+object History {
+    @Volatile private var instance: HistoryStore? = null
+
+    fun init(context: Context) {
+        if (instance == null) {
+            synchronized(this) {
+                if (instance == null) instance = HistoryStore(context.applicationContext)
+            }
+        }
+    }
+
+    fun get(): HistoryStore = instance
+        ?: error("HistoryStore not initialized — call History.init(context)")
+}

strawApp/src/main/kotlin/com/sulkta/straw/feature/detail/VideoDetailViewModel.kt

@@ -7,6 +7,8 @@ package com.sulkta.straw.feature.detail
 
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
+import com.sulkta.straw.data.History
+import com.sulkta.straw.data.WatchHistoryItem
 import com.sulkta.straw.net.RydClient
 import com.sulkta.straw.net.RydVotes
 import kotlinx.coroutines.Dispatchers
@@ -48,6 +50,23 @@ class VideoDetailViewModel : ViewModel() {
             try {
                 val info = withContext(Dispatchers.IO) { StreamInfo.getInfo(streamUrl) }
                 val videoId = info.id
+                val thumb = info.thumbnails?.firstOrNull()?.url
+                val title = info.name ?: "(no title)"
+                val uploader = info.uploaderName ?: ""
+
+                runCatching {
+                    History.get().recordWatch(
+                        WatchHistoryItem(
+                            url = streamUrl,
+                            videoId = videoId,
+                            title = title,
+                            uploader = uploader,
+                            thumbnail = thumb,
+                            watchedAt = 0L,
+                        ),
+                    )
+                }
+
                 val ryd = withContext(Dispatchers.IO) {
                     runCatching { RydClient.fetch(videoId) }.getOrNull()
                 }
@@ -55,11 +74,11 @@ class VideoDetailViewModel : ViewModel() {
                     loading = false,
                     detail = VideoDetail(
                         id = videoId,
-                        title = info.name ?: "(no title)",
-                        uploader = info.uploaderName ?: "",
+                        title = title,
+                        uploader = uploader,
                         viewCount = info.viewCount,
                         description = info.description?.content ?: "",
-                        thumbnail = info.thumbnails?.firstOrNull()?.url,
+                        thumbnail = thumb,
                         ryd = ryd,
                     ),
                     streamInfo = info,

strawApp/src/main/kotlin/com/sulkta/straw/feature/search/SearchScreen.kt

@@ -36,9 +36,13 @@ import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.text.input.ImeAction
 import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.unit.dp
+import androidx.compose.foundation.layout.FlowRow
+import androidx.compose.material3.AssistChip
+import androidx.compose.runtime.collectAsState
 import androidx.lifecycle.compose.collectAsStateWithLifecycle
 import androidx.lifecycle.viewmodel.compose.viewModel
 import coil3.compose.AsyncImage
+import com.sulkta.straw.data.History
 
 @Composable
 fun SearchScreen(
@@ -46,6 +50,7 @@ fun SearchScreen(
     vm: SearchViewModel = viewModel(),
 ) {
     val state by vm.ui.collectAsStateWithLifecycle()
+    val recentSearches by History.get().searches.collectAsState()
 
     Column(modifier = Modifier.fillMaxSize().padding(16.dp)) {
         OutlinedTextField(
@@ -76,6 +81,33 @@ fun SearchScreen(
                 )
             }
 
+            state.results.isEmpty() && state.query.isBlank() -> {
+                if (recentSearches.isEmpty()) {
+                    Box(
+                        modifier = Modifier.fillMaxSize(),
+                        contentAlignment = Alignment.Center,
+                    ) { Text("Type a query and hit search.") }
+                } else {
+                    Text(
+                        "Recent searches",
+                        style = MaterialTheme.typography.titleSmall,
+                        fontWeight = FontWeight.SemiBold,
+                    )
+                    Spacer(modifier = Modifier.height(8.dp))
+                    FlowRow(horizontalArrangement = Arrangement.spacedBy(8.dp)) {
+                        recentSearches.forEach { q ->
+                            AssistChip(
+                                onClick = {
+                                    vm.onQueryChange(q)
+                                    vm.submit()
+                                },
+                                label = { Text(q) },
+                            )
+                        }
+                    }
+                }
+            }
+
             state.results.isEmpty() && state.query.isNotBlank() -> Box(
                 modifier = Modifier.fillMaxSize(),
                 contentAlignment = Alignment.Center,

strawApp/src/main/kotlin/com/sulkta/straw/feature/search/SearchViewModel.kt

@@ -7,6 +7,7 @@ package com.sulkta.straw.feature.search
 
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
+import com.sulkta.straw.data.History
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.StateFlow
@@ -45,6 +46,7 @@ class SearchViewModel : ViewModel() {
     fun submit() {
         val q = _ui.value.query.trim()
         if (q.isEmpty()) return
+        runCatching { History.get().recordSearch(q) }
         _ui.value = _ui.value.copy(loading = true, error = null, results = emptyList())
         viewModelScope.launch {
             try {