fix(podcasts): page search hits episode titles/descriptions (issue #8)

WHY: the /podcasts search box filtered feed CARDS only (title, display
name, host, publisher, feed description). D14's episode search existed
only as the /api/podcasts/search endpoint and was never wired into the
page — searching 'Quarter' (present only in episode titles) cleared the
grid while 'Trader' (feed metadata) survived.

The page query now consults SearchMyPodcastEpisodes (subscription-scoped
via RLS — the caller's identity) when a query is present; a feed
surfaces when its OWN metadata OR any of its episodes matches, with an
'N matching episode(s)' badge on the card.

PIN: SSR test with a needle that exists only in an episode title — the
feed must surface with the match count.

internal/router/podcast_page.go

@@ -168,11 +168,27 @@ func buildPodcastsPageData(c *echo.Context, cfg *Config) (*templates.PodcastsPag
 	host := c.QueryParam("host")
 	tag := c.QueryParam("tag")
 	lang := c.QueryParam("language")
+
+	// Episode-level matches (issue #8 / D14): a query also hits episode
+	// titles + descriptions — the feed surfaces with a match count.
+	// SearchMyPodcastEpisodes is subscription-scoped via RLS (the
+	// caller's identity). Only consult it when a query is present.
+	matchesByFeed := make(map[string]int)
+	if q != "" {
+		if eps, err := cfg.Queries.SearchMyPodcastEpisodes(ctx, q); err == nil {
+			for i := range eps {
+				key := uuid.UUID(eps[i].SourceFeedID.Bytes).String()
+				matchesByFeed[key]++
+			}
+		}
+	}
+
 	filtered := data.Feeds[:0:0]
 	for _, f := range data.Feeds {
 		if q != "" {
 			hay := strings.ToLower(f.Title + " " + f.DisplayName + " " + f.Host + " " + f.Publisher + " " + f.Description)
-			if !strings.Contains(hay, q) {
+			matched := matchesByFeed[f.ID]
+			if !strings.Contains(hay, q) && matched == 0 {
 				continue
 			}
 		}
@@ -196,6 +212,11 @@ func buildPodcastsPageData(c *echo.Context, cfg *Config) (*templates.PodcastsPag
 		}
 		filtered = append(filtered, f)
 	}
+	if q != "" {
+		for i := range filtered {
+			filtered[i].EpisodeMatches = matchesByFeed[filtered[i].ID]
+		}
+	}
 	data.Feeds = filtered
 	data.Query = q
 	data.ContinueFeeds = templates.PodcastContinueFeeds(data.Feeds)