test(quotesdb): add hidden flag filter tests to native repository

Add three tests verifying hidden-quote filtering behaviour in
NativeRepository:

- list_quotes_excludes_hidden: hidden quotes do not appear in paginated
  listing results.
- get_random_quote_excludes_hidden: get_random_quote returns None when
  the only quote is hidden.
- get_quote_returns_hidden_quote: get_quote (direct ID lookup) still
  returns the quote when it is hidden.

Also refactor the inline row-mapping closure in list_quotes to use the
existing row_to_quote helper, eliminating duplicated column mapping
logic.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

quotesdb/src/bin/api/db/native.rs

@@ -191,20 +191,7 @@ impl QuoteRepository for NativeRepository {
                 let partial_quotes: Vec<Quote> = stmt
                     .query_map(
                         rusqlite::params_from_iter(param_refs2.iter().copied()),
-                        |row| {
-                            let hidden_int: i64 = row.get(5)?;
-                            Ok(Quote {
-                                id: row.get(0)?,
-                                text: row.get(1)?,
-                                author: row.get(2)?,
-                                source: row.get(3)?,
-                                date: row.get(4)?,
-                                hidden: hidden_int != 0,
-                                created_at: row.get(6)?,
-                                updated_at: row.get(7)?,
-                                tags: vec![],
-                            })
-                        },
+                        |row| row_to_quote(row, vec![]),
                     )?
                     .collect::<Result<Vec<_>, _>>()?;
 
@@ -984,4 +971,135 @@ mod tests {
         let stored = repo.get_admin_auth_code().await.unwrap();
         assert_eq!(stored.as_deref(), Some("correct-code"));
     }
+
+    // ── hidden flag filter tests ───────────────────────────────────────────────
+
+    /// `list_quotes` must exclude hidden quotes and include only visible ones.
+    #[tokio::test]
+    async fn test_list_quotes_excludes_hidden() {
+        let repo = in_memory_repo().await;
+
+        // Create a visible quote and a hidden quote.
+        let (visible, _) = repo
+            .create_quote(CreateQuoteInput {
+                text: "Visible quote".to_owned(),
+                author: "Author A".to_owned(),
+                source: None,
+                date: None,
+                tags: vec![],
+                auth_code: Some("auth-visible-xxxxx".to_owned()),
+                cf_turnstile_token: None,
+            })
+            .await
+            .unwrap();
+
+        let (hidden, hidden_auth) = repo
+            .create_quote(CreateQuoteInput {
+                text: "Hidden quote".to_owned(),
+                author: "Author B".to_owned(),
+                source: None,
+                date: None,
+                tags: vec![],
+                auth_code: Some("auth-hidden-xxxxxx".to_owned()),
+                cf_turnstile_token: None,
+            })
+            .await
+            .unwrap();
+
+        // Mark the second quote as hidden.
+        repo.update_quote(
+            &hidden.id,
+            UpdateQuoteInput {
+                hidden: Some(true),
+                ..UpdateQuoteInput::default()
+            },
+            &hidden_auth,
+        )
+        .await
+        .unwrap();
+
+        let result = repo.list_quotes(1, None, None, None, None).await.unwrap();
+        assert_eq!(result.total_count, 1, "only the visible quote should count");
+        assert_eq!(result.quotes.len(), 1);
+        assert_eq!(
+            result.quotes[0].id, visible.id,
+            "the returned quote must be the visible one"
+        );
+    }
+
+    /// `get_random_quote` must return `None` when the only quote is hidden.
+    #[tokio::test]
+    async fn test_get_random_quote_excludes_hidden() {
+        let repo = in_memory_repo().await;
+
+        // Create a single quote and immediately hide it.
+        let (quote, auth) = repo
+            .create_quote(CreateQuoteInput {
+                text: "Only quote, hidden".to_owned(),
+                author: "Ghost".to_owned(),
+                source: None,
+                date: None,
+                tags: vec![],
+                auth_code: Some("auth-ghost-xxxxxxx".to_owned()),
+                cf_turnstile_token: None,
+            })
+            .await
+            .unwrap();
+
+        repo.update_quote(
+            &quote.id,
+            UpdateQuoteInput {
+                hidden: Some(true),
+                ..UpdateQuoteInput::default()
+            },
+            &auth,
+        )
+        .await
+        .unwrap();
+
+        let result = repo.get_random_quote().await.unwrap();
+        assert!(
+            result.is_none(),
+            "get_random_quote should return None when only hidden quotes exist"
+        );
+    }
+
+    /// `get_quote` (direct ID lookup) must return the quote even when it is hidden.
+    #[tokio::test]
+    async fn test_get_quote_returns_hidden_quote() {
+        let repo = in_memory_repo().await;
+
+        let (quote, auth) = repo
+            .create_quote(CreateQuoteInput {
+                text: "Accessible but hidden".to_owned(),
+                author: "Secret Author".to_owned(),
+                source: None,
+                date: None,
+                tags: vec![],
+                auth_code: Some("auth-secret-xxxxxx".to_owned()),
+                cf_turnstile_token: None,
+            })
+            .await
+            .unwrap();
+
+        repo.update_quote(
+            &quote.id,
+            UpdateQuoteInput {
+                hidden: Some(true),
+                ..UpdateQuoteInput::default()
+            },
+            &auth,
+        )
+        .await
+        .unwrap();
+
+        let fetched = repo.get_quote(&quote.id).await.unwrap();
+        assert!(
+            fetched.is_some(),
+            "get_quote must return the quote even when it is hidden"
+        );
+        let fetched = fetched.unwrap();
+        assert_eq!(fetched.id, quote.id);
+        assert!(fetched.hidden, "the returned quote must have hidden=true");
+    }
 }