feat: confirm a saved quotation with a short note

app/lib/presentation/reader/reader_screen.dart

@@ -338,12 +338,24 @@ class _ReaderScreenState extends State<ReaderScreen> {
             deps.browser.narrowWhileTyping(form.action, values),
         // The reader's marked text is kept with the page it came from, so
         // its citation can name the author when the page did.
-        onSaveQuotation: (text) => deps.db.addQuotation(
-              quote: text,
-              pageUrl: page.url,
-              pageTitle: page.title,
-              author: page.author,
-            ),
+        onSaveQuotation: (text) async {
+          // Taken before the wait, so the note does not reach across it.
+          final messenger = ScaffoldMessenger.of(context);
+          final saved = AppScope.of(context).strings.t('quotations-saved');
+          await deps.db.addQuotation(
+            quote: text,
+            pageUrl: page.url,
+            pageTitle: page.title,
+            author: page.author,
+          );
+          if (!mounted) return;
+          // Closing the toolbar looks the same either way, so the save
+          // says it happened.
+          messenger.showSnackBar(SnackBar(
+            duration: const Duration(seconds: 2),
+            content: Text(saved),
+          ));
+        },
         fetchImageBytes: deps.browser.fetchImageBytes,
         scrollController: _scroll,
       );