fix(intraday): mark a chart from before the latest session

stocks intraday never set quote.behind_session, so on a holiday or when
Stockbit lags, a past session's chart read as current. Mark it as quotes
do and print the same note under the header.

Claude-Session: https://claude.ai/code/session_01RqPPVeVDrnLoP7NUZmLRxY

crates/idx-core/src/market.rs

@@ -75,7 +75,7 @@ impl Market<'_> {
         let idx = self.idx;
         let resolved = idx.resolve(symbol)?;
         let provider = intraday_provider();
-        cached_fetch(
+        let mut day = cached_fetch(
             &idx.cache,
             CacheSpec {
                 bucket: "stockbit-intraday",
@@ -87,7 +87,11 @@ impl Market<'_> {
             policy,
             || provider.intraday(&resolved),
             Ok,
-        )
+        )?;
+        // Stockbit's page keeps the last session's chart up after the close,
+        // so a cached or lagging day reads as current unless it is marked.
+        mark_behind_session(&mut day.data.quote, latest_session(Utc::now()));
+        Ok(day)
     }
 
     /// Resolves the history source for an optional `--history-provider`