Straw phase I: SB segment count chip + clear-history buttons

Detail screen: VideoDetailViewModel now also fetches SponsorBlock segment
count for the user's currently-enabled categories alongside RYD. When >0,
detail screen shows a "⏭ N skip(s)" AssistChip next to the like/dislike
chips. Lets the user see at-a-glance whether SB is going to do anything
on this video before tapping Play.

Settings screen: "History" section at the bottom with two OutlinedButtons —
"Clear watch history" and "Clear searches". Each calls the corresponding
HistoryStore.clear* method. List updates immediately via the StateFlow.

Empty-category set on SB now means "skip the API call" (was already
checking this in PlayerViewModel.resolve, now also in VideoDetailViewModel).

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

@@ -115,6 +115,12 @@ fun VideoDetailScreen(
                             ),
                         )
                     }
+                    if (d.sbSegmentCount > 0) {
+                        AssistChip(
+                            onClick = {},
+                            label = { Text("⏭ ${d.sbSegmentCount} skip${if (d.sbSegmentCount == 1) "" else "s"}") },
+                        )
+                    }
                 }
 
                 Spacer(modifier = Modifier.height(16.dp))

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

@@ -8,9 +8,11 @@ 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.Settings
 import com.sulkta.straw.data.WatchHistoryItem
 import com.sulkta.straw.net.RydClient
 import com.sulkta.straw.net.RydVotes
+import com.sulkta.straw.net.SponsorBlockClient
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.StateFlow
@@ -27,6 +29,7 @@ data class VideoDetail(
     val description: String,
     val thumbnail: String?,
     val ryd: RydVotes? = null,
+    val sbSegmentCount: Int = 0,
 )
 
 data class VideoDetailUiState(
@@ -70,6 +73,10 @@ class VideoDetailViewModel : ViewModel() {
                 val ryd = withContext(Dispatchers.IO) {
                     runCatching { RydClient.fetch(videoId) }.getOrNull()
                 }
+                val sbCats = Settings.get().sbCategories.value.map { it.key }
+                val sbCount = if (sbCats.isEmpty()) 0 else withContext(Dispatchers.IO) {
+                    runCatching { SponsorBlockClient.fetch(videoId, sbCats).size }.getOrDefault(0)
+                }
                 _ui.value = VideoDetailUiState(
                     loading = false,
                     detail = VideoDetail(
@@ -80,6 +87,7 @@ class VideoDetailViewModel : ViewModel() {
                         description = info.description?.content ?: "",
                         thumbnail = thumb,
                         ryd = ryd,
+                        sbSegmentCount = sbCount,
                     ),
                     streamInfo = info,
                 )

strawApp/src/main/kotlin/com/sulkta/straw/feature/settings/SettingsScreen.kt

@@ -17,6 +17,7 @@ import androidx.compose.foundation.rememberScrollState
 import androidx.compose.foundation.verticalScroll
 import androidx.compose.material3.HorizontalDivider
 import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.OutlinedButton
 import androidx.compose.material3.Switch
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
@@ -26,6 +27,7 @@ import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.unit.dp
+import com.sulkta.straw.data.History
 import com.sulkta.straw.data.SbCategory
 import com.sulkta.straw.data.Settings
 
@@ -68,6 +70,22 @@ fun SettingsScreen() {
             )
             HorizontalDivider()
         }
+
+        Spacer(modifier = Modifier.height(32.dp))
+        Text(
+            "History",
+            style = MaterialTheme.typography.titleMedium,
+            fontWeight = FontWeight.SemiBold,
+        )
+        Spacer(modifier = Modifier.height(12.dp))
+        Row(horizontalArrangement = Arrangement.spacedBy(12.dp)) {
+            OutlinedButton(onClick = { History.get().clearWatches() }) {
+                Text("Clear watch history")
+            }
+            OutlinedButton(onClick = { History.get().clearSearches() }) {
+                Text("Clear searches")
+            }
+        }
     }
 }