merge: video embed on detail page (Worker R2)

# Conflicts:
#	internal/web/views_templ.go

internal/adapters/store/reads.go

@@ -25,19 +25,20 @@ var ErrNotFound = errors.New("store: summary not found")
 // not part of the Stage-0 store slice yet. When that table is migrated, swap the
 // JOIN source — callers already fall back gracefully on an empty Channel.
 type SummaryRow struct {
-	VideoID      string
-	Title        string    // videos.title; empty when no videos row
-	Channel      string    // videos.provider for now; empty when no videos row
-	URL          string    // videos.url; empty when no videos row
-	PublishedAt  time.Time // videos.published_at; zero when absent
-	Summary      string
-	Highlights   []string
-	Takeaways    []string
-	AIProvider   string
-	AIModel      string
-	FallbackUsed bool
-	CreatedAt    time.Time
-	Actions      []string // current active actions for this video; nil when none
+	VideoID         string
+	ProviderVideoID string    // videos.provider_video_id; empty when no videos row
+	Title           string    // videos.title; empty when no videos row
+	Channel         string    // videos.provider for now; empty when no videos row
+	URL             string    // videos.url; empty when no videos row
+	PublishedAt     time.Time // videos.published_at; zero when absent
+	Summary         string
+	Highlights      []string
+	Takeaways       []string
+	AIProvider      string
+	AIModel         string
+	FallbackUsed    bool
+	CreatedAt       time.Time
+	Actions         []string // current active actions for this video; nil when none
 }
 
 // selectSummary is the shared projection for both reads. videos is LEFT JOINed
@@ -45,6 +46,7 @@ type SummaryRow struct {
 // crosses users and a missing videos row yields nulls, not a dropped summary.
 const selectSummary = `
 	SELECT s.video_id,
+	       COALESCE(v.provider_video_id, ''),
 	       COALESCE(v.title, ''),
 	       COALESCE(v.provider, ''),
 	       COALESCE(v.url, ''),
@@ -153,6 +155,7 @@ func scanSummaryRow(rows pgx.Row) (SummaryRow, error) {
 	)
 	if err := rows.Scan(
 		&row.VideoID,
+		&row.ProviderVideoID,
 		&row.Title,
 		&row.Channel,
 		&row.URL,