Match library search date: token case-insensitively

Found while testing crates/catalog/src/query.rs:178 (token_matches, the "date" branch at :215)

Co-Authored-By: Claude Haiku 5.5 <noreply@anthropic.com>
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

crates/catalog/src/query.rs

@@ -226,7 +226,7 @@ fn token_matches(p: &Photo, tok: &str) -> bool {
             "person" | "who" => has_person(p, val),
             "type" | "kind" => format!("{:?}", p.kind).eq_ignore_ascii_case(val),
             "edited" => (val == "true" || val == "yes") == p.is_edited(),
-            "date" => p.captured.as_deref().is_some_and(|c| c.starts_with(val)),
+            "date" => p.captured.as_deref().is_some_and(|c| c.get(..val.len()).is_some_and(|h| h.eq_ignore_ascii_case(val))),
             "copy" | "virtual" => (val == "true" || val == "yes") == p.copy_of.is_some(),
             "name" | "file" => p.file_name.to_lowercase().contains(val),
             // Not a known field: the colon is part of a plain word ("10:30", "Re:"), its value unquoted

crates/catalog/src/tests.rs

@@ -12,6 +12,17 @@ fn photo(c: &mut Catalog, name: &str, date: &str) -> PhotoId {
     id
 }
 
+#[test]
+fn date_token_matches_time_part_case_insensitively() {
+    let mut c = Catalog::new();
+    let a = photo(&mut c, "a.jpg", "2026-05-01T10:00:00");
+    let q = |c: &Catalog, text: &str| c.query(&Filter { text: text.into(), ..Default::default() }, &Sort::default());
+    assert_eq!(q(&c, "date:2026-05-01T10"), vec![a]);
+    assert_eq!(q(&c, "date:2026-05-01t10"), vec![a]);
+    assert_eq!(q(&c, "date:2026-05"), vec![a]);
+    assert!(q(&c, "date:2026-05-01T11").is_empty());
+}
+
 #[test]
 fn apply_and_inverse_roundtrip() {
     let mut c = Catalog::new();