Style transcript turns and bump style.css cache version

The renderer emits .transcript-turn and .transcript-speaker, neither of which
had any CSS, so speaker labels and turns rendered unstyled. Extends the
existing .speaker-label rule rather than duplicating it.

Bumps style.css to v=7 everywhere — the file changed, and pages referenced a
mix of v=5 and v=6, so some visitors would have kept a cached copy without the
new rules.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

website/css/style.css

@@ -1536,13 +1536,23 @@ a:hover {
   margin-bottom: 1.25rem;
 }
 
-.speaker-label {
+.speaker-label,
+.transcript-speaker {
   font-weight: 700;
   color: var(--accent);
   font-size: 0.85rem;
   letter-spacing: 0.03em;
 }
 
+/* Static episode pages render one block per speaker turn. */
+.transcript-turn {
+  margin-bottom: 1.25rem;
+}
+
+.transcript-turn p {
+  margin: 0.2rem 0 0;
+}
+
 .transcript-unavailable {
   color: var(--text-muted);
   font-style: italic;