Podcast player: calmer line-following scroll, and a voice you can pick

"The scrolling works kinda weirdly" + "maybe a less robotic voice, preferably
male".

Scroll: the transcript now follows by LINE, not by word - words on the same
line never move the page (that was the jitter), a line only scrolls once it
leaves a comfortable band, small corrections are instant rather than animated,
and a wheel/touch/drag on the transcript pauses the following for four seconds
instead of fighting the reader. Chapter jumps and word taps re-centre at once.

Voice: lib/podcast-voices ranks what the platform installed (natural / neural
/ online names up, espeak / SAM / compact down, a male name preferred) and the
player picks the best one automatically; a new picker in the chrome lists
everything in the episode's language, applies it live and remembers the choice
per language. A note points at the system settings when only robotic voices
exist. The engine takes the chosen voice instead of guessing.

podcast-test: 34 checks now (voice ranking, filtered picker, persisted pick,
same-line silence, line following, manual-scroll suspension). Version 0.7.4,
SW v96.

package.json

@@ -1,6 +1,6 @@
 {
   "name": "freezmo",
-  "version": "0.7.3",
+  "version": "0.7.4",
   "private": true,
   "license": "GPL-3.0-only",
   "scripts": {