Keep the Radio tuning dial silent unless a stream is playing

Releasing the tuning dial always started the chosen station, plus tuning
static, even when nothing was playing. It now follows the Previous/Next
rule: the release plays only if a stream was loading, buffering or playing
when the drag began; otherwise it just selects the station.

The privacy note no longer lists finishing tuning as a way to connect and
now names voice instead, in all locales. Docs, changelog and comments are
tightened to match.

src/ui/views/panels/RadioPanel.vue

@@ -67,7 +67,7 @@ const radioWords = computed(() => ({
       <a id="radio-station-homepage" :href="radio ? radio.station.homepage || undefined : '#'" target="_blank" rel="noopener noreferrer" :hidden="radio ? !radio.station.homepage : true">{{ t('STATION SITE') }}</a>
       <a href="https://www.radio-browser.info/" target="_blank" rel="noopener noreferrer">{{ t('DIRECTORY: RADIO BROWSER') }}</a>
     </div>
-    <p class="radio-privacy">{{ t('Audio connects directly to the broadcaster when you press play, finish tuning or choose a station on the globe. Your IP is visible to that broadcaster.') }}</p>
+    <p class="radio-privacy">{{ t('Audio connects directly to the broadcaster when you press play, choose a station on the globe or ask voice to play. Your IP is visible to that broadcaster.') }}</p>
     <SdrCard />
 </RailPanel>
 </template>