Move Library button to right side, rename notebook list title

- Page list: Library button moved to actions (right side) with titleLarge
- Notebook list: title changed to "Engineering Pad :: Library"

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

app/src/main/kotlin/net/metacircular/engpad/ui/notebooks/NotebookListScreen.kt

@@ -59,7 +59,7 @@ fun NotebookListScreen(
 
     Scaffold(
         topBar = {
-            TopAppBar(title = { Text("eng-pad") })
+            TopAppBar(title = { Text("Engineering Pad :: Library") })
         },
         floatingActionButton = {
             FloatingActionButton(onClick = { showCreateDialog = true }) {

app/src/main/kotlin/net/metacircular/engpad/ui/pages/PageListScreen.kt

@@ -102,9 +102,9 @@ fun PageListScreen(
         topBar = {
             TopAppBar(
                 title = { Text(notebookTitle) },
-                navigationIcon = {
+                actions = {
                     androidx.compose.material3.TextButton(onClick = onClose) {
-                        Text("Library")
+                        Text("Library", style = MaterialTheme.typography.titleLarge)
                     }
                 },
             )