Misc cleanup

- Migrate sources filter screen to full compose
- Use standard "OK"/"Cancel" actions for delete category dialog
- Abstract some AppBar logic
- Remove some dead code
- Group related strings

app/src/main/java/eu/kanade/presentation/components/AppBar.kt

@@ -2,8 +2,14 @@ package eu.kanade.presentation.components
 
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.RowScope
+import androidx.compose.foundation.layout.WindowInsets
+import androidx.compose.foundation.layout.WindowInsetsSides
+import androidx.compose.foundation.layout.only
+import androidx.compose.foundation.layout.systemBars
+import androidx.compose.foundation.layout.windowInsetsPadding
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.ArrowBack
+import androidx.compose.material.icons.filled.Close
 import androidx.compose.material.icons.filled.MoreVert
 import androidx.compose.material3.DropdownMenuItem
 import androidx.compose.material3.Icon
@@ -11,11 +17,16 @@ import androidx.compose.material3.IconButton
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.SmallTopAppBar
 import androidx.compose.material3.Text
+import androidx.compose.material3.TopAppBarDefaults
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.derivedStateOf
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
 import androidx.compose.runtime.setValue
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.drawBehind
+import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.graphics.vector.ImageVector
 import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.text.font.FontWeight
@@ -24,29 +35,82 @@ import eu.kanade.tachiyomi.R
 
 @Composable
 fun AppBar(
+    modifier: Modifier = Modifier,
+    // Text
     title: String?,
     subtitle: String? = null,
+    // Up button
     navigateUp: (() -> Unit)? = null,
     navigationIcon: ImageVector = Icons.Default.ArrowBack,
+    // Menu
     actions: @Composable RowScope.() -> Unit = {},
+    // Action mode
+    actionModeCounter: Int = 0,
+    onCancelActionMode: () -> Unit = {},
+    actionModeActions: @Composable RowScope.() -> Unit = {},
+    // Banners
+    downloadedOnlyMode: Boolean = false,
+    incognitoMode: Boolean = false,
 ) {
-    SmallTopAppBar(
-        navigationIcon = {
-            navigateUp?.let {
-                IconButton(onClick = it) {
-                    Icon(
-                        imageVector = navigationIcon,
-                        contentDescription = stringResource(R.string.abc_action_bar_up_description),
-                    )
+    val isActionMode by derivedStateOf { actionModeCounter > 0 }
+    val backgroundColor = if (isActionMode) {
+        TopAppBarDefaults.smallTopAppBarColors().containerColor(1f).value
+    } else {
+        MaterialTheme.colorScheme.surface
+    }
+
+    Column(
+        modifier = modifier.drawBehind { drawRect(backgroundColor) },
+    ) {
+        SmallTopAppBar(
+            modifier = Modifier.windowInsetsPadding(WindowInsets.systemBars.only(WindowInsetsSides.Top)),
+            navigationIcon = {
+                if (isActionMode) {
+                    IconButton(onClick = onCancelActionMode) {
+                        Icon(
+                            imageVector = Icons.Default.Close,
+                            contentDescription = stringResource(id = R.string.action_cancel),
+                        )
+                    }
+                } else {
+                    navigateUp?.let {
+                        IconButton(onClick = it) {
+                            Icon(
+                                imageVector = navigationIcon,
+                                contentDescription = stringResource(R.string.abc_action_bar_up_description),
+                            )
+                        }
+                    }
                 }
-            }
-        },
-        title = {
-            AppBarTitle(title, subtitle)
-            // TODO: incognito/downloaded only banners
-        },
-        actions = actions,
-    )
+            },
+            title = {
+                if (isActionMode) {
+                    AppBarTitle(actionModeCounter.toString())
+                } else {
+                    AppBarTitle(title, subtitle)
+                }
+            },
+            actions = {
+                if (isActionMode) {
+                    actionModeActions()
+                } else {
+                    actions()
+                }
+            },
+            // Background handled by parent
+            colors = TopAppBarDefaults.smallTopAppBarColors(
+                containerColor = Color.Transparent,
+                scrolledContainerColor = Color.Transparent,
+            ),
+        )
+
+        if (downloadedOnlyMode) {
+            DownloadedOnlyModeBanner()
+        }
+        if (incognitoMode) {
+            IncognitoModeBanner()
+        }
+    }
 }
 
 @Composable