feat: add BookmarkNoteDialog composable

Co-Authored-By: Claude <noreply@anthropic.com>

core/ui/src/main/kotlin/com/google/samples/apps/nowinandroid/core/ui/BookmarkNoteDialog.kt

@@ -0,0 +1,51 @@
+package com.google.samples.apps.nowinandroid.core.ui
+
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.material3.AlertDialog
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.OutlinedTextField
+import androidx.compose.material3.Text
+import androidx.compose.material3.TextButton
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+
+@Composable
+fun BookmarkNoteDialog(
+    initialNote: String = "",
+    onDismiss: (note: String) -> Unit,
+) {
+    var note by remember { mutableStateOf(initialNote) }
+
+    AlertDialog(
+        onDismissRequest = { onDismiss(note) },
+        title = { Text("Add a note") },
+        text = {
+            Column {
+                OutlinedTextField(
+                    value = note,
+                    onValueChange = { if (it.length <= 280) note = it },
+                    label = { Text("Note (optional)") },
+                    maxLines = 4,
+                    modifier = Modifier.fillMaxWidth(),
+                )
+                Text(
+                    text = "${note.length}/280",
+                    style = MaterialTheme.typography.labelSmall,
+                    modifier = Modifier.align(Alignment.End),
+                )
+            }
+        },
+        confirmButton = {
+            TextButton(onClick = { onDismiss(note) }) { Text("Save") }
+        },
+        dismissButton = {
+            TextButton(onClick = { onDismiss("") }) { Text("Skip") }
+        },
+    )
+}